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| 1 | A Model to Predict Stall Inception of Transonic Axial Flow Fan/Compressors显示文摘A stall inception model for transonic fan/compressors is presented in this paper. It can be shown that under some assumptions the solution of unsteady flow field consists of pressure wave which propagates upstream or downstream, vortex wave and entropy wave convected with the mean flow speed. By further using the mode-matching technique and applying the conservation law and conditions reflecting the loss characteristics of a compressor in the inlet and outlet of the rotor or stator blade rows, a group of homogeneous equations can be obtained from which the stability equation can be derived. Based on the analysis of the unsteady phenomenon caused by casing treatments, the function of casing treatments has been modeled by a wall impedance condition which has been included in the stability model through the eigenvalues and the corresponding eigenfunctions of the system. Besides, the effect of shock waves in cascade channel on the stability prediction is also considered in the stall inception model. Finally, some numerical analysis and experimental investigation are also conducted with emphasis on the mutual comparison. | SUN Xiaofeng SUN Dakun YU Weiwei | 2011 | Chinese Journal of Aeronautics2011，24，6： | 20 |
| 2 | Curative effect of heat-sensitive moxibustion on chronic persistent asthma: a multicenter randomized controlled trial显示文摘OBJECTIVE:To compare the curative effects of heat-sensitive moxibustion with conventional drugs on chronic persistent asthma and seek a valuable therapy to replaceWestern Medicine.METHODS:The participants in this multi-center,randomized,and controlled study were randomly divided into two groups:group A(n=144),treated with heat-sensitive moxibustion(50 sessions)and group B(n=144),treated with Seretide(salmeterol50μg/fluticasone 250μg,twice a day).The scores of asthma control test(ACT),forced expiratory volume in 1 second(FEV1),peak expiratory flow(PEF),and attack frequency were measured after 15,30,60,and 90 days of treatment.Patients followed up3 and 6 months after treatment.RESULTS:There was a significant difference(P=0.0002)in the ACT score and lung function between the two groups after 3 months of treatment and(P=0.000 03)during the follow-up visits.In addition,heat-sensitive moxibustion reduced attack frequency in the period from inclusion to the6-month follow-up visit.CONCLUSION:This study shows that heat-sensitive moxibustion may have a comparable curative effect toSeretide(salmeterol/fluticasone)on asthma. | Rixin Chen Mingren Chen Jun Xiong Zhenhai Chi B0 Zhang Ning Tian Zhenhua Xu Tangfa Zhang Wanyao Li Wei Zhang Xiaofeng Rong Zhen Wang Gang Sun Baohe Ge Guoxiong Yu Nanchang Song | 2013 | Journal of Traditional Chinese Medicine2013，33，5： | 20 |
| 3 | A Pilot Study of the Therapeutic Efficacy and Mechanism of Artesunate in the MRL/lpr Murine Model of Systemic Lupus Erythematosus显示文摘Recent evidence indicates that artesunate has immunomodulatory properties that might be useful for treating autoimmune disease.In this study,we conducted a pilot study and explored the effect and mechanism of artesunate on the treatment of systemic lupus erythematosus using an MRL/lpr murine model.MRL/lpr mice were divided into control,cyclophosphamide(CTX)and artesunate treatment groups.Blood was collected to measure serum levels of creatinine,antinuclear antibody(ANA)and anti-double-stranded DNA(anti-dsDNA)antibody.Twenty-four-hour urine was collected to measure levels of proteinuria.The concentration of monocyte chemotactic protein-1(MCP-1)in serum and urine was measured.The expression of MCP-1 in kidney was detected by Western blot and immunohistochemistry assay,respectively.The expression of B cell activating factor(BAFF)in spleen was determined by real time-PCR and immunoblotting.We found that artesunate significantly increased the survival rate,body weight and blood leukocyte counts,and reduced the serum levels of ANA and anti-dsDNA antibody titer,24 h urinary protein,and serum creatinine.Our results indicated that artesunate could decrease MCP-1,major pro-inflammation cytokine,in serum,urine and kidney.We also found that the level of BAFF,the major B cell activation factor,was decreased in artesunate treated MRL/lpr mice.Its efficacy was comparable with that of CTX in this study.Taken together,we have demonstrated that artesunate can inhibit the progression of disease and reverse the pathologic lesion of lupus nephritis. | Ouyang Jin Huayong Zhang Zhifeng Gu Shengnan Zhao Ting Xu Kangxing Zhou Bo Jiang Jie Wang Xiaofeng Zeng Lingyun Sun | 2009 | Cellular & Molecular Immunology2009，6，6： | 20 |
| 4 | Recent development of casing treatments for aeroengine compressors显示文摘Casing treatment is a mature stabilization technique which has been widely applied on aero-engines for modern aircrafts and turbo-chargers for automobiles. After the investigations of half century since the 1960 s, this technique has been well developed for various configurations with different effectiveness. From the perspective of stabilization mechanism, this paper roughly categorizes the configurations of casing treatment into two types: traditional ones which work by affecting the flow structure of blade tip region; a novel one named as Stall Precursor-Suppressed(SPS) casing treatment. The effectiveness of both types will be demonstrated for their applications on axial compressors and centrifugal compressors with uniform or distorted inlet. And the stabilization mechanism of casing treatments for regular types and SPS one will also be explained respectively. In addition, this review will summarize the methodologies of casing treatments with the numerical simulations for regular grooved configurations and the eigenvalue approach for SPS casing treatment.Looking forward to the future of compressor stabilization, casing treatment technique will still exist as a general and inexpensive option, and the exploration for its effectiveness and mechanism will be deeper with the development of computational fluid dynamics and advanced measurement techniques. | Xiaofeng SUN Xu DONG Dakun SUN | 2019 | Chinese Journal of Aeronautics2019，32，1： | 16 |
| 5 | Evolution of Grain Selection in Spiral Selector during Directional Solidification of Nickel-base Superalloys显示文摘The process of grain selection in the spiral selector was investigated by both a ProCAST simulation based on a cellular automaton finite element(CAFE) model and experimental confirmation.The results show that the height of starter block,the spiral diameter and initial angle play an important role in grain selection.The dimension of selector should be maintained in a stable range to optimize the grain orientation and select a single crystal efficiently.A selector which can efficiently select a single crystal had been successfully designed.Grain orientation fluctuation in the spiral part was also studied by means of the variation of thermal condition. | Xiangbin Meng Jinguo Li Tao Jin Xiaofeng Sun Changbo Sun Zhuangqi Hu | 2011 | Journal of Materials Science & Technology2011，27，2： | 15 |
| 6 | Thermal fatigue behavior of K465 superalloy显示文摘The thermal fatigue behavior of K465 superalloy was investigated at the peak temperature of 1050°C. By scan-ning electron microscopy (SEM) and optical microscopy, the main crack length was observed and measured. The initiation sites of the tested alloys are different in as-cast (named as K465) and solution heat treatment (named as SK465) conditions. In K465 alloy, most thermal fatigue cracks nucleate at (Nb,W,Ti)C carbides. In SK465 alloy, thermal fatigue cracks initiate in interdendritic regions, MC-type carbides and some interfaces. Thermal fatigue cracks propagate in transdendritic mode, and M6C-type carbides could retard thermal fatigue crack growth for SK465 superalloy. | YANG Jinxia ZHENG Qi SUN Xiaofeng GUAN Hengrong HU Zhuangqi | 2006 | Rare Metals2006，25，3： | 15 |
| 7 | Comparison of the toxicity of silver nanoparticles and silver ions on the growth of terrestrial plant model Arabidopsis thaliana显示文摘Silver nanoparticles (AgNPs) are one of the most widely used nanomaterials, but the mechanism of AgNP toxicity in terrestrial plants is still unclear. We compared the toxic effects of AgNPs and Ag+ on Arabidopsis thaliana at the physiological, ultrastructural and molecular levels. AgNPs did not affect seed germination; however, they showed stronger inhibitory effect on root elongation than Ag+ . The results of transmission electron microscopy and metal content analysis showed that AgNPs could be accumulated in leaves. These absorbed AgNPs disrupted the thylakoid membrane structure and decreased chlorophyll content, which can inhibit plant growth. By comparison, a small amount of Ag+ was absorbed by seedlings, and it did not pronouncedly affect chloroplast structure and other metal ion absorption as AgNPs did. Compared with Ag+ , AgNPs could alter the transcription of antioxidant and aquaporin genes, indicating that AgNPs changed the balance between the oxidant and antioxidant systems, and also affected the homeostasis of water and other small molecules within the plant body. All the data from physiological, ultrastructural and molecular levels suggest that AgNPs were more toxic than Ag+ . | Haifeng Qian Xiaofeng Peng Xiao Han Jie Ren Liwei Sun Zhengwei Fu | 2013 | Journal of Environmental Sciences2013，25，9： | 14 |
| 8 | Fine-Tuning of MiR528 Accumulation Modulates Flowering Time in Rice显示文摘In plants,microRNA (miRNA) functions in the post-transcriptional repression of target mRNAs have been well explored.However,the mechanisms regulating the accumulation of miRNAs remain poorly under.stood.Here,we report that distinct mechanisms regulate accumulation of a monocot-specific miRNA,rice (Oryza sativa) miR528.At the transcriptional level,miR528 accumulated to higher levels in older plants than in young seedlings and exhibited aging-modulated gradual accumulation and diurnal rhythms in leaves;at the post-transcriptional level,aging also modulated miR528 levels by enhancing pri-miR528 alter.native splicing.We found that miR528 promotes rice flowering under long-day conditions by targeting RED AND FAR-RED INSENSITIVE2 (OsRFI2).Moreover,natural variations in the MIR528 promoter region caused differences in miR528 expression among rice varieties,which are correlated with their different binding affinities with the transcription factor OsSPL9 that activates the expression of miR528.Taken together,our findings reveal rice plants have evolved sophisticated modes fine-tuning miR528 levels and provide insight into the mechanisms that regulate MIRNA expression in plants. | Rongxin Yang Pingchuan Li Hailiang Mei Dong Wang Jing Sun Chao Yang Lili Hao Shouyun Cao Chengcai Chu Songnian Hu Xianwei Song Xiaofeng Cao | 2019 | Molecular Plant2019，12，8： | 12 |
| 9 | Neuroprotective effects of Ginkgo biloba extract and GinkgoUde B against oxygen-glucose deprivation/reoxygenation and glucose injury in a new in vitro multicellular network model显示文摘 | Xiaohan Yang Tiezheng Zheng Hao Hong Nan Cai Xiaofeng Zhou Changkai Sun Liying Wu Shuhong Liu Yongqi Zhao Lingling Zhu Ming Fan Xuezhong Zhou Fengxie Jin | 2018 | Frontiers of Medicine2018，12，3： | 12 |
| 10 | Genome Characteristics and Evolution of Pseudorabies Virus Strains in Eastern China from 2017 to 2019显示文摘Since late 2011,outbreaks of pseudorabies virus(PRV)have occurred in southern China causing major economic losses to the pig industry.We previously reported that variant PRV forms and recombination in China could be the source of continued epidemics.Here,we analyzed samples from intensive pig farms in eastern China between 2017 and 2019,and sequenced the main glycoproteins(gB,gC,gD,and gE)to study the evolution characteristics of PRV.Based on the gC gene,we found that PRV variants belong to clade 2 and detected a founder effect during by the PRV epidemic.In addition,we detected inter-and intra-clade recombination;in particular,inter-clade recombination in the gB genes of strains FJ-ZXF and FJ-W2,which were recombinant with clade 1 strains.We also found specific amino-acid changes and positively selected sites,possibly associated with functional changes.This analysis of the emergence of PRV in China illustrates the need for continuous monitoring and the development of vaccines against specific variants of PRV. | Xiaofeng Zhai Wen Zhao Kemang Li Cheng Zhang Congcong Wang Shuo Su Jiyong Zhou Jing Lei Gang Xing Haifeng Sun Zhiyu Shi Jinyan Gu | 2019 | Virologica Sinica2019，34，6： | 12 |
| 11 | CPSF30-L-mediated recognition of mRNA m^(6)A modification controls alternative polyadenylation of nitrate signaling-related gene transcripts in Arabidopsis显示文摘N6-methyladenosine(m^(6)A),a ubiquitous internal modification of eukaryotic mRNAs,plays a vital role in almost every aspect of mRNA metabolism.However,there is little evidence documenting the role of m^(6)A in regulating alternative polyadenylation(APA)in plants.APA is controlled by a large protein-RNA complex with many components,including CLEAVAGE AND POLYADENYLATION SPECIFICITY FACTOR30(CPSF30).In Arabidopsis,CPSF30 has two isoforms and the longer isoform(CPSF30-L)contains a YT512-B Homology(YTH)domain,which is unique to plants.In this study,we showed that CPSF30-L YTH domain binds to m^(6)A in v itro.In the cpsf30-2 mutant,the transcripts of many genes including several important nitrate signaling-related genes had shifts in polyadenylation sites that were correlated with m^(6)A peaks,indicating that these gene transcripts carrying m^(6)A tend to be regulated by APA.Wild-type CPSF30-L could rescue the defects in APA and nitrate metabolism in cpsf30-2,but m^(6)A-binding-defective mutants of CPSF30-L could not.Taken together,our results demonstrated that m^(6)A modification regulates APA in Arabidops is and revealed that the m^(6)A reader CPSF30-L affects nitrate signaling by controlling APA,shedding new light on the roles of the m^(6)A modification during RNA 3-end processing in nitrate metabolism. | Yiteng Hou Jing Sun Baixing Wu Yangyang Gao Hongbo Nie Zhentian Nie Shuxuan Quan Yong Wang Xiaofeng Cao Sisi Li | 2021 | Molecular Plant2021，14，4： | 12 |
| 12 | Cloud-resolving model for weather modification in China显示文摘Weather modification is widely carried out in China.It is important to develop an operational model for weather modification to predict the microphysical features of cloud and precipitation and to help locate possible seeding areas.A two-moment microphysics scheme is developed using a quasi-implicit calculation method.The scheme predicts the evolution of mass as well as the number densities of the five hydrometeor types.Some microphysical processes are specified.The scheme is implemented with mesoscale models that have been run operationally for weather modification in China. | LOU XiaoFeng SHI YueQin SUN Jing XUE LuLin HU ZhiJin FANG Wen LIU WeiGuo | 2012 | Chinese Science Bulletin2012，57，9： | 12 |
| 13 | Flow Stability Model for Fan/Compressors with Annular Duct and Novel Casing Treatment显示文摘A three-dimensional compressible flow stability model is presented in this paper, which focuses on stall inception of multi-stage axial flow compressors with a finite large radius annular duct configuration for the first time. It is shown that under some assumptions, the stability equation can be obtained yielding from a group of homogeneous equations. The stability can be judged by the non-dimensional imaginary part of the resultant complex frequency eigenvalue. Further more, based on the analysis of the unsteady phenomenon caused by casing treatment, the function of casing treatment has been modeled by a wall impedance condition which is included in the stability model through the eigenvalues and the corresponding eigenfunctions of the system. Finally, some experimental investigation and two numerical evaluation cases are conducted to validate this model and emphasis is placed on numerically studying the sensitivity of the setup of different boundary conditions on the stall inception of axial flow fan/compressors. A novel casing treatment which consists of a backchamber and a perforated plate is suggested, and it is noted that the open area ratio of the casing treatment is less than 10%, and is far smaller than conventional casing treatment with open area ratio of over 50%, which could result in stall margin improvement without obvious efficiency loss of fan/compressors. | LIU Xiaohua SUN Dakun SUN Xiaofeng WANG Xiaoyu | 2012 | Chinese Journal of Aeronautics2012，25，2： | 12 |
| 14 | Identification of botanical origin of Chinese unifloral honeys by free amino acid profiles and chemometric methods显示文摘The amino acid contents of five floral sources Chinese honeys(jujube, rape, chaste, acacia, and lungan) were measured using reversed phase high-performance liquid chromatography(RP-HPLC). The results showed that proline was the main amino acid in most of the analyzed samples. Phenylalanine presents at the highest content in chaste honey samples, and the total amino acid contents of chaste honeys were also significantly higher than those of other honey samples. Based on the amino acid contents, honey samples were classified using chemometric methods(cluster analysis(CA), principal component analysis(PCA), and discriminant analysis(DA)). According to the CA results, chaste honeys could be separated from other honeys, while the remaining samples were correctly grouped together when the chaste honey data were excluded. By using DA, the overall correct classification rate reached 100%. The results revealed that amino acid contents could potentially be used as indicators to identify the botanical origin of unifloral honeys. | Zheng Sun Lingling Zhao Ni Cheng Xiaofeng Xue Liming Wu Jianbin Zheng Wei Cao | 2017 | Journal of Pharmaceutical Analysis2017，7，5： | 9 |
| 15 | Allele-aware chromosome-level genome assembly of Artemisia annua reveals the correlation between ADS expansion and artemisinin yield显示文摘Artemisia annua is the major natural source of artemisinin,an anti-malarial medicine commonly used worldwide.Here,we present chromosome-level haploid maps for two A.annua strains with different artemisinin contents to explore the relationships between genomic organization and artemisinin production.High-fidelity sequencing,optical mapping,and chromatin conformation capture sequencing were used to assemble the heterogeneous and repetitive genome and resolve the haplotypes of A.annua.Approximately 5o,ooo genes were annotated for each haplotype genome,and a triplication event that occurred approximately 58.12million years ago was examined for the first time in this species.A total of 3,903,467-5,193,414 variants(SNPs,indels,and structural variants)were identified in the 1.5-Gb genome during pairwise comparison between haplotypes,consistent with the high heterozygosity of this species.Genomic analyses revealed a correlation between artemisinin concents and the copy number of amorpha-4,11-dienes ynthasegenes.This correlation was further confirmed by resequencing of 36A.annua samples with varied artemisinin contents.Circular consensus sequencing of transcripts facilitated the detection of paralog expression.Collectively,our study provides chromosome-level allele-aware genome assemblies for two A.annua strains and new insights into the biosynthesis of artemisinin and its regulation,which will contribute to conquering malaria worldwide. | Baosheng Liao Xiaofeng Shen Li Xiang Shuai Guo Shiyu Chen Ying Meng Yu Liang Dandan Ding Junqi Bai Dong Zhang Tomasz Czechowski Yi Li Hui Yao Tingyu Mai Caroline Howard Chao Sun Haitao Liu Jiushi Liu Jin Pei Jihai Gao Jigang Wang Xiaohui Qiu Zhihai Huang Hongyi Li Ling Yuan Jianhe Wei lan Graham Jiang Xu Boli Zhang Shilin Chen | 2022 | Molecular Plant2022，15，8： | 9 |
| 16 | Functional Characterization of the Promoter and Second Intron of CUM1 During Flower Development in Cucumber(Cucumis sativus L.)显示文摘The characterization of flower specific promoter is critical during flower development by cucumber transformation technology.AGAMOUS(AG)is an organ identity gene that is required for carpel and stamen development in Arabidopsis.The promoter and second intron of AG contain multiple regulatory elements that confer proper spatial and temporal expression.Cucumber is an important vegetable with unisexual flowers.Cucumber MADS-box 1(CUM1)is the AG homolog in cucumber,belonging to the eu AG lineage along with AG.In situ hybridization showed that CUM1 was specifically expressed in the stamens and carpels of cucumber.GUS staining indicated that the second intron of CUM1 confers stamen-specific expression,while the promoter of CUM1 drives both stamen-and carpel-specific expression during the early stages of flower development,but is restricted to carpel-and connectivum-specific expression during the late stages of flower development.Furthermore,a yeast one-hybrid assay demonstrated that two auxin response factors(Cs ARF13 and Cs ARF17)had bound directly to the second intron of CUM1.Our data suggest that different regulatory circuits operate in AG homologs in plant species with distinct sex types. | GU Ran LIU Xiaofeng ZHAO Wensheng YAN Shuangshuang SUN Linhan WU Binning ZHANG Xiaolan | 2018 | Horticultural Plant Journal2018，4，3： | 9 |
| 17 | The mechanism of barrier river reaches in the middle and lower Yangtze River显示文摘在它人工地或自然地被扰乱以后,冲积隧道总是以沉积运输的平衡国家调整了自己。怎么维持沉积运输的平衡国家并且使河政体稳定总是是河的 geomorphologists 的担心。在长江的中间、更低的活动范围的隧道被区分的河和单个线的河的蹒跚的分发描绘。河政体的变化比在单个线的河里在区分的河里猛烈地是更多。区分的河里的河政体的调整是否能通过单个线的河并且宣传到下游的活动范围,影响全面的河政体的稳定性。研究证明障碍河活动范围能阻止宣传到下游的活动范围接近在上游的隧道调整;因此,它在稳定河政体起一个关键作用。这研究在长江的中间、更低的活动范围调查 34 个单个线的河活动范围。根据长江的中间、更低的活动范围的河的进程的系统的摘要,障碍河活动范围的控制因素被总结并且提取:平面形态学单个线、蜿蜒地流;没有流动偏斜,节点在河活动范围的上面或中间的部分散布了;水力的几何系数是不到 4;纵的坡度比 12 大,凹面河岸的泥土内容比 9.5% 大,并且床沉积的中部的直径比 0.158 公里大。从海军司烧方程,流动的弯曲半径的计算公式动态轴被推出,然后这些的角色在限制流动的迁居上控制因素动态轴和障碍河活动范围的形成被分析。当时,障碍河活动范围被看作这到隧道边界的限制力量的动态轴是的流动的迁居力量的比率不到 1 在不同流动层次下面。障碍河活动范围的机制是以便甚至当在上游的河政体调整时,这个活动范围的隧道边界能总是抑制流动的移植振幅动态轴并且在不同的在上游的河政体条件下面集中主要的流线的平面位置,提供相对稳定的到来的流动为下游的活动范围调节,从而阻止宣传到下游的活动范围接近在上游的河政体调整。 | YOU Xingying TANG Jinwu ZHANG Xiaofeng HOU Weiguo YANG Yunping SUN Zhaohua WENG Zhaohui | 2017 | Journal of Geographical Sciences2017，27，10： | 9 |
| 18 | 基于体波有限频层析成像的青藏高原南部和中部下方印度大陆岩石层俯冲和撕裂的三维图像显示文摘使用TIBET-31N无源地震台阵以及以前临时地震台阵记录到的远震体波数据进行了有限频层析成像反演,对青藏高原南部及中部的三维速度结构成像。在喜马拉雅和拉萨地块下方存在向北倾角40°的高速体。我们把这些高速异常区域解释为俯冲的印度大陆岩石层(ICL)。印度大陆岩石层似乎在青藏高原中部比东部向北延伸更多——沿85°E在31°N到达350km深处,而沿91°E则是在30°N到达350km深度。P波和S波低速异常区在当惹雍错裂谷、亚东—谷露裂谷和错那裂谷下方从下地壳延伸至≥180km深度,这表明青藏高原南部的裂谷可能包含了整个岩石层的变形。当惹雍错裂谷下方的异常区向下延伸到约180km,而亚东—谷露裂谷西部和错那裂谷东部的异常延伸到了超过300km的深度。亚东—谷露裂谷西部的低速区上地幔延伸至最北,并且似乎与青藏高原中部下方广阔的上地幔低速区相连。于是,北向俯冲的印度板块沿着南北走向的裂缝撕裂。这些裂缝允许或者导致的软流层上涌同青藏高原北部上地幔相类似。 | Xiaofeng Liang Yun Chen Xiaobo Tian Yongshun John Chen James Ni Andrea Gallegos Simon L.Klemperer Minling Wang Tao Xu Changqing Sun Shaokun Si Haiqiang Lan Jiwen Teng 左思成 | 2016 | 世界地震译丛2016，47，6： | 8 |
| 19 | Modes of Grain Selection in Spiral Selector during Directional Solidification of Nickel-base Superalloys显示文摘The modes of grain selection in spiral selector were investigated by both a ProCAST simulation and experimental confirmation.The results show that the efficiency of grain selection in starter block is associated with the geometry shape.At the early stage of grain selection,the optimization of grain orientation is dominated by competitive grain growth,but the optimization of grain orientation in starter block is gradually dominated by geometry shape at the later stage of grain selection.Besides,the spiral part could also optimize the orientation of the selected single crystal when the initial angle is large enough,and the single crystal selection in spiral parts with different pitch lengths and initial angles is dominated by different modes.The simulation results agree well with experimental ones. | Xiangbin Meng Qi Lu Jinguo Li Tao Jin Xiaofeng Sun Jun Zhang ZhongqiangChen Yanhui Wang Zhuangqi Hu | 2012 | Journal of Materials Science & Technology2012，28，3： | 8 |
| 20 | Influence of SPS casing treatment on axial flow compressor subjected to radial pressure distortion显示文摘The present work is about the stall margin enhancement ability of a kind of stall precursor-suppressed(SPS) casing treatment when fan/compressor suffers from a radial total pressure inlet distortion.Experimental researches are conducted on a low-speed compressor with and without SPS casing treatment under radial distorted inlet flow of different levels as well as uniform inlet flow.The distorted flow fields of different levels are generated by annular distortion flow generators of different heights.The characteristic curves under these conditions are measured and analyzed.The results show that the radial inlet distortion could cause a stall margin loss from 2%to30%under different distorted levels.The SPS casing treatment could remedy this stall margin loss under small distortion level and only partly make up the stall margin loss caused by distortion in large level without leading to perceptible additional efficiency loss and obvious change of characteristic curves.The pre-stall behavior of the compressor is investigated to reveal the mechanism of this stall margin improvement ability of the SPS casing treatment.The results do show that this casing treatment delays the occurrence of rotating stall by weakening the pressure perturbations and suppressing the nonlinear amplification of the stall precursor waves in the compression system. | Li Fanyu Li Jun Dong Xu Sun Dakun Sun Xiaofeng | 2017 | Chinese Journal of Aeronautics2017，30，2： | 8 |
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