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| 1 | Performance improvement of optimization solutions by POD-based data mining显示文摘The performance of an optimized aerodynamic shape is further improved by a second-step optimization using the design knowledge discovered by a data mining technique based on Proper Orthogonal Decomposition(POD) in the present study. Data generated in the first-step optimization by using evolution algorithms is saved as the source data, among which the superior data with improved objectives and maintained constraints is chosen. Only the geometry components of the superior data are picked out and used for constructing the snapshots of POD. Geometry characteristics of the superior data illustrated by POD bases are the design knowledge, by which the second-step optimization can be rapidly achieved. The optimization methods are demonstrated by redesigning a transonic compressor rotor blade, NASA Rotor 37, in the study to maximize the peak adiabatic efficiency, while maintaining the total pressure ratio and mass flow rate.Firstly, the blade is redesigned by using a particle swarm optimization method, and the adiabatic efficiency is increased by 1.29%. Then, the second-step optimization is performed by using the design knowledge, and a 0.25% gain on the adiabatic efficiency is obtained. The results are presented and addressed in detail, demonstrating that geometry variations significantly change the pattern and strength of the shock wave in the blade passage. The former reduces the separation loss,while the latter reduces the shock loss, and both favor an increase of the adiabatic efficiency. | Yanhui DUAN Wenhua WU Peihong ZHANG Fulin TONG Zhaolin FAN Guiyu ZHOU Jiaqi LUO | 2019 | Chinese Journal of Aeronautics2019，32，4： | 3 |
| 2 | Direct numerical simulation of impinging shock wave and turbulent boundary layer interaction over a wavy-wall显示文摘The interaction of an impinging oblique shock wave with an angle of 30°and a supersonic turbulent boundary layer at Ma_(∞)=2.9 and Re_(θ)=2400 over a wavy-wall is investigated through direct numerical simulation and compared with the interaction on a flat-plate under the same flow conditions.A sinusoidal wave with amplitude to wavelength ratio of 0.26 moves in the streamwise direction and is uniformly distributed across the spanwise direction.The influences of the wavy-wall on the interaction,including the characterization of the flow field,the skin-friction,pressure and the budget of turbulence kinetic energy,are systematically studied.The region of separation grows slightly and decomposes into four bubbles.Local peaks of skin-friction are observed at the rear part of the interaction region.The low-frequency shock motion can be seen in the wall pressure spectra.Analyses of the turbulence kinetic energy budget indicate that both diffusion and transport significantly increase near the crests,balanced by an amplified dissipation in the near-wall region.Proper orthogonal decomposition analyses show that the most energetic structures are associated with the separated shock and the shear layer over the bubbles.Only the bubbles in the first two troughs are dominated by a low-frequency enlargement or shrinkage. | Fulin TONG Dong SUN Xinliang LI | 2021 | Chinese Journal of Aeronautics2021，34，5： | 3 |
| 3 | Ribonuclease H-like gene SMALL GRAIN2 regulates grain size in rice through brassinosteroid signaling pathway显示文摘Grain size is a key agronomic trait that determines the yield in plants.Regulation of grain size by brassinosteroids(BRs)in rice has been widely reported.However,the relationship between the BR signaling pathway and grain size still requires further study.Here,we isolated a rice mutant,named small grain2(sg2),which displayed smaller grain and a semi-dwarf phenotype.The decreased grain size was caused by repressed cell expansion in spikelet hulls of the sg2 mutant.Using map-based cloning combined with a Mut Map approach,we cloned SG2,which encodes a plant-specific protein with a ribonuclease H-like domain.SG2 is a positive regulator downstream of GLYCOGEN SYNTHASE KINASE2(GSK2)in response to BR signaling,and its mutation causes insensitivity to exogenous BR treatment.Genetical and biochemical analysis showed that GSK2 interacts with and phosphorylates SG2.We further found that BRs enhance the accumulation of SG2 in the nucleus,and subcellular distribution of SG2 is regulated by GSK2 kinase activity.In addition,Oryza sativa OVATE family protein 19(OsOFP19),a negative regulator of grain shape,interacts with SG2 and plays an antagonistic role with SG2 in controlling gene expression and grain size.Our results indicated that SG2 is a new component of GSK2-related BR signaling response and regulates grain size by interacting with Os OFP19. | Yunshuai Huang Hui Dong Changling Mou Ping Wang Qixian Hao Min Zhang Hongmin Wu Fulin Zhang Tengfei Ma Rong Miao Kai Fu Yaping Chen Ziyan Zhu Cheng Chen Qikai Tong Zhuoran Wang Shirong Zhou Xi Liu Shijia Liu Yunlu Tian Ling Jiang Jianmin Wan | 2022 | Journal of Integrative Plant Biology2022，64，10： | 1 |
| 4 | 靶向肾癌中的E3连接酶接头蛋白SPOP的小分子抑制剂显示文摘近年来肾癌发病率上升幅度在恶性肿瘤中排名第一。临床治疗表明,肾癌对放疗和化疗均不敏感,以索拉非尼和舒尼替尼为代表的靶向抗肿瘤药物是晚期肾癌的一线治疗药物,但对转移性肾癌的疗效十分有限,并且容易产生耐药。因此,发现并确证治疗肾癌特异性药物作用新靶标是一项十分紧迫并意义重大的任务。 | Zhong-Qiang Guo Tong Zheng Baoen Chen Cheng Luo Sisheng Ouyang Shouzhe Gong Jiafei Li Liu-Liang Mao Fulin Lian Yong Yang Yue Huang Li Li Jing Lu Bidong Zhang Luming Zhou Hong Ding Zhiwei Gao Liqun Zhou Guoqiang Li Ran Zhou Ke Chen Jingqiu Liu Yi Wen Likun Gong Yuwen Ke Shang-Dong Yang Xiao-Bo Qiu Naixia Zhang Jin Ren Dafang Zhong 杨财广 刘江 蒋华良 | 2017 | 科学新闻2017，19，4： | 1 |
| 5 | Direct numerical simulation of hypersonic boundary layer transition over a liftingbody model HyTRV显示文摘Direct numerical simulation(DNS)of transition over a hypersonic lifting body model HyTRV developed by China Aerodynamics Research and Development Center is performed.The free-stream parameters are:the free-stream Mach number is 6,the unit Reynolds number is 10000/mm,the free-stream temperature is 79 K,the angle of attack is 0,and the wall temperature is 300 K.Weak random blowing-and-suction perturbations in the leading range are used to trigger the transition.A high order finite-difference code OpenCFD developed by the authors is used for the simulation,and grid convergence test shows that the transition locations are grid-convergence.DNS results show that transition occurs in central area of the lower surface and the concaved region of the upper surface,and the transition regions are also the streamline convergence regions.The transition mechanisms in different regions are investigated by using the spectrum and POD analysis. | Han Qi Xinliang Li Changping Yu Fulin Tong | 2021 | Advances in Aerodynamics2021，3，1： | 1 |
| 6 | Decomposition of mean skin friction in incident shock wave/turbulent boundary layer interaction flows at Mach 2.25显示文摘The evolution characteristics of the mean skin friction beneath the supersonic turbulent boundary layer that interacts with incident shock waves at Mach 2.25 are analyzed using Direct Numerical Simulation(DNS). The separated and attached boundary layers in the interaction region that respectively correspond to 33.2° and 28° incident shock angles are considered. The mean skin friction recovery rate for the separated boundary layer is much gentler and distinctly less than that for the attached case where the skin friction completes its recovery within one boundary layer thickness. The novel mean skin friction decomposition method for compressible flows proposed by the recent research is applied in the interaction region to investigate the internal evolution characteristics quantitatively. The results reveal that the three decomposition components are distinctly unequal between the two cases. The contributions of the turbulent motions at different scales to the associated term are focused on using empirical mode decomposition technology. It indicates that the outer large-scale structures dominate separation and reattachment regions, while contributions from inner small-scale structures are limited. In contrast, contributions from the outer largescale structures are dramatically reduced in the attached case, which results in the outer large-scale and inner small-scale motions being of equal importance. | Junyi DUAN Fulin TONG Xinliang LI Hongwei LIU | 2023 | Chinese Journal of Aeronautics2023，36，9： | 0 |
| 7 | Characteristics of reattached boundary layer in shock wave and turbulent boundary layer interaction显示文摘The reattached boundary layer in the interaction of an oblique shock wave with a flatplate turbulent boundary layer at Mach number 2.25 is studied by means of Direct Numerical Simulation(DNS).The numerical results are carefully compared with available experimental and DNS data in terms of turbulence statistics,wall pressure and skin friction.The coherent vortex structures are significantly enhanced due to the shock interaction,and the reattached boundary layer is characterized by large-scale structures in the outer region.The space-time correlation of fluctuating wall shear stress and streamwise velocity fluctuation reveals that the structural inclination angle exhibits a gradual decrease during the recovery process.The scale interactions are analyzed by using a twopoint amplitude modulation correlation.A possible mechanism is proposed to account for the strong amplitude modulation in the downstream region.Moreover,the mean skin-friction is decomposed to understand the physically informed contributions.Unlike the upstream Turbulent Boundary Layer(TBL),the contribution associated with the Turbulence Kinetic Energy(TKE)production is greatly amplified,while the spatial growth contribution induced by the pressure gradient largely inhibits skin-friction generation.Based on bidimensional empirical mode decomposition,the turbulence kinetic energy production contribution is further split into different terms with specific spanwise length scales. | Fulin TONG Junyi DUAN Xinliang LI | 2022 | Chinese Journal of Aeronautics2022，35，6： | 0 |
| 8 | Hypersonic shock wave and turbulent boundary layer interaction in a sharp cone/flare model显示文摘A direct numerical simulation of hypersonic Shock wave and Turbulent Boundary Layer Interaction(STBLI)at Mach 6.0 on a sharp 7.half-angle circular cone/flare configuration at zero angle of attack is performed.The flare angle is 34.and the momentum thickness Reynolds number based on the incoming turbulent boundary layer on the sharp circular cone is Re θ=2506.It is found that the mean flow is separated and the separation bubble occurring near the corner exhibits unsteadiness.The Reynolds analogy factor changes dramatically across the interaction,and varies between 1.06 and 1.27 in the downstream region,while the QP85 scaling factor has a nearly constant value of 0.5 across the interaction.The evolution of the reattached boundary layer is characterized in terms of the mean profiles,the Reynolds stress components,the anisotropy tensor and the turbulence kinetic energy.It is argued that the recovery is incomplete and the near-wall asymptotic behavior does not occur for the hypersonic interaction.In addition,mean skin friction decomposition in an axisymmetric turbulent boundary layer is carried out for the first time.Downstream of the interaction,the contributions of transverse curvature and body divergence are negligible,whereas the positive contribution associated with the turbulence kinetic energy production and the negative spatial-growth contribution are dominant.Based on scale decomposition,the positive contribution is further divided into terms with different spanwise length scales.The negative contribution is analyzed by comparing the convective term,the streamwise-heterogeneity term and the pressure gradient term. | Fulin TONG Junyi DUAN Jiang LAI Dong SUN Xianxu YUAN | 2023 | Chinese Journal of Aeronautics2023，36，3： | 0 |
| 9 | Carbon capture and storage(CCS):development path based on carbon neutrality and economic policy显示文摘In order to limit global warming to 2°C,countries have adopted carbon capture and storage(CCS)technologies to reduce greenhouse gas emission.However,it is currently facing challenges such as controversial investment costs,unclear policies,and reduction of new energy power generation costs.In particular,some CCS projects are at a standstill.To promote the development of CCS projects in different countries,this paper reviews and compares energy conservation and emission reduction policies and different national goals.From a policy perspective,CCS-driven policies are analyzed.Based on this,corresponding policy recommendations are put forward,in order to promote the healthy development of global CCS technology and deal with climate issues more effectively.With less than 10 years away from the short-term goal,promoting the development and application of CCS projects requires scientific research from universities,enterprises and governments in order to attain zero or negative CO_(2)emission.On the basis of focusing on the development of CCS technology,according to the actual situation of each country,the appropriate application of CCS engineering should focus on the development of science and technology,rather than a unified requirement around the world. | Minghai Shen Fulin Kong Lige Tong Yang Luo Shaowu Yin Chuanping Liu Peikun Zhang Li Wang Paul K.Chu Yulong Ding | 2022 | Carbon Neutrality2022，1，1： | 0 |
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