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| 1 | Effect of Particle Size Distribution on Radiative Heat Transfer in High-Temperature Homogeneous Gas-Particle Mixtures显示文摘The weighted-sum-of-gray-gas(WSGG)model and Mie theory are applied to study the influents of particle size on the radiative transfer in high temperature homogeneous gas-particle mixtures,such as the flame in aero-engine combustor.The radiative transfer equation is solved by the finite volume method.The particle size is assumed to obey uniform distribution and logarithmic normal(L-N)distribution,respectively.Results reveal that when particle size obeys uniform distribution,increasing particle size with total particle volume fraction fvunchanged will result in the decreasing of the absolute value of radiative heat transfer properties,and the effect of ignoring particle scattering will also be weakened.Opposite conclusions can be obtained when total particle number concentration N0 is unchanged.Moreover,if particle size obeys L-N distribution,increasing the narrowness indexσor decreasing the characteristic diameter Dˉwith the total particle volume fraction fvunchanged will increase the absolute value of radiative heat transfer properties.With total particle number concentration N0 unchanged,opposite conclusions for radiative heat source and incident radiation terms can be obtained except for radiative heat flux term.As a whole,the effects of particle size on the radiative heat transfer in the high-temperature homogeneous gas-particle mixtures are complicated,and the particle scattering cannot be ignoring just according to the particle size. | LIANG Dong HE Zhenzong XU Liang MAO Junkui | 2019 | Transactions of Nanjing University of Aeronautics and Astronautics2019，36，5： | 3 |
| 2 | Retrieval of aerosol optical constants from angular light-scattering measurement signals using principal component analysis approach显示文摘An angular light-scattering measurement (ALSM) method combined with the probability density function-bmsed ant colony optimization algorithm (PDF-ACO) is proposed for retrieval of aerosol optical constants. An optimal measurement angle selection method using a principal component analysis (PCA) approach is developed to improve retrieval accuracy. Results indicate that optimized angle selection can ensure retrieval accuracy. The aerosol optical constants over Beijing, China, which are available from the Aerosol Robotic Network (AERONET), are then rec on structed. The ALSM method's con vergence properties are also studied via comparison w让h those of the light reflection-transmittance measurement (LRTM) method. Results retrieved using the ALSM method show better convergence speed and accuracy than those retrieved using the LRTM method because the ALSM method does not require solution of the radiative transfer equation and allows more useful signals to be obtained. Additionally, the inverse accuracy of the refractive index results is better than that of the absorption index results;this is attributed to differences between the monodromic characteristics of the refractive index and absorption index retrieval results. All results confirm that the combination of the ALSM method w让h the PDF-ACO algorithm and the optimal measurement angle selection method provides effective and reliable aerosol optical constant reconstructio n. | Zhenzong He Junkui Mao Xingsi Han Hao Wang | 2019 | Particuology2019，17，2： | 2 |
| 3 | Experimental Study on Impingement and Film Overall Cooling Characteristics of Turbine Shroud显示文摘Based on the variable characteristics of the actual operating conditions of the turbine shroud and the purpose of improving the cooling effect of the turbine shroud,this paper builds a test system of the impingement-film cooling shroud with two gas inlet angles(90°,167°).The effects of film cooling hole arrangement,gas inlet angle,blowing ratio(0.7,1.0,1.5,2.0,2.5,3.0)and temperature ratio(1.2,1.3,1.4,1.5,1.6)on the cooling characteristics of the impingement-film cooling shroud were experimentally studied by infrared temperature measurement technology,especially the effects of gas inlet angle and temperature ratio.The results showed that the film covering effect of the film cooling hole vertical or the same direction of the high-temperature gas incoming flow is better than the film covering effect of the reverse direction with the incoming flow,and the optimal arrangement of film cooling holes can improve the cooling effectiveness of the shroud.Compared with 90°intake gas,the film coverage area on the shroud surface of the 167°intake gas is expanded,and the surface average overall cooling effectiveness is increased by 1.03%to 12.6%.The overall cooling effectiveness of turbine shroud increases with the increase of blowing ratio,which increases the flow rate and pressure of cooling gas,and the corresponding increase rate is between 1.04%and 9.96%.However,the increase in the temperature ratio increases the mainstream heating capacity,resulting in a decrease in the cooling effectiveness of the shroud,with a maximum reduction rate of 11.04%. | LI Ziqiang WANG Longfei MAO Junkui BI Shuai WANG Feilong | 2022 | Journal of Thermal Science2022，31，1： | 1 |
| 4 | Radiation Safety Report of HIRFL in 2011显示文摘 | Su Youwu Li Zongqiang Li Wuyuan Xu Junkui Mao Wang Yan Weiwei Xu Chong | 2011 | IMP & HIRFL Annual Report2011，，1： | 1 |
| 5 | Enhancement of oxygen evolution reaction activity and durability of Ba0.5Sr0.5Co0.8Fe0.2O3-δ by CO2 thermal treatment显示文摘This work demonstrates that in situ formation of carbonate layer on the surface of Ba0.5Sr0.5Co0.8Fe0.2O3-δ(BSCF)obtained by exposure to CO2 during heating between 500℃ and 700℃ can provide enhanced oxygen evolution reaction(OER)performance and durability in an alkaline solution relative to the original BSCF.Three temperatures,i.e., 500℃,600℃,and 700℃ were chosen to perform the CO2 thermal treatment,resulting into BSCF-500,BSCF-600,and BSCF-700 samples.The OER was enhanced in the order of BSCF-500< BSCF-700 < BSCF-600. BSCF-600 showed the best OER performance, i.e., a low overpotential of 0.36 V required to attain 10 mA cm^-2 current density as well as a mass activity of 74.14 Agcmcat-1 and a specific activity of 5.04 mA cmcat-2 at an overpotential of 0.4 V. The OER performance durability of BSCF-600 was highlighted by its ability to maintain a stable potential of around 1.61 V vs. RHE (RHE: reversible hydrogen electrode) when charged at a constant current density of 10 mA cm^-2 throughout the 800 min continuous chronopotentiometry test. The enhanced OER performance for BSCF-600 relative to the original BSCF is attributed to three factors:(i) higher electrochemically active surface area;(ii) faster charge transfer rate and higher electrical conductivity;and (iii) modified oxidation state of cobalt ions. The formation of thin carbonate layer in BSCF-600 appears to suppress the durability issue observed in BSCF. | Fengli Liang Ziqiong Yang Haipeng Deng Jaka Sunarso Lili Yang Junkui Mao | 2019 | Journal of Materials Science & Technology2019，35，6： | 1 |
| 6 | 6 - 35 Measurement Results of Soil Radiation Level around HIRFL in 2012显示文摘 | Xu Chong Xu Junkui Su Youwu Pang Chengguo Mao Wang | 2012 | IMP & HIRFL Annual Report2012，，1： | 0 |
| 7 | 6-43 Radiation Safety Report of HIRFL in 2016显示文摘The total operation time of HIRFL is 7 488 h in 2016,the user beam time is about 5 547.5 h(from 21 Dec.2015 to 21 Dec.2016).3 178 h for physics experiment,238.5 h for biological physics science research,2 023 h for irradiation effect research,and 108 h for machine research.There are 26 heavy ions beams were provided by HIRFL in 2016.The highest ions energy provided is 7.9 MeV/u,the maximum accumulated ion intensity is 1μA.Environment radiation level was measured with TLDs which were placed in the yard of the institute around HIRFL,15 sites of radiation level show no difference with environment background level of Gansu province[1]. | Su Youwu Xu Junkui Li Zongqiang Li Wuyuan Mao Wang Wang Lijun Xu Chong Yan Weiwei | 2016 | IMP & HIRFL Annual Report2016，，1： | 0 |
| 8 | 6-44 Studying of Residual Activity Induced by 300 MeV/u Carbon Ion in Copper Target显示文摘Activation of accelerator components due to beam losses is an important issue for a high-energy heavy ion accelerator.The induced components may become a main source of exposure to maintenance workers and a serious access-restriction for“hand-on”maintenance,and also have a certain radiation influence over the environment.In this work,experimental of residual activation induced by 300 MeV/u carbon ions was studied at the deep-therapy terminal of HIRFL. | Xu Junkui Su Youwu Li Wuyuan Pang Chengguo Yan Weiwei Xu Chong Mao Wang | 2016 | IMP & HIRFL Annual Report2016，，1： | 0 |
| 9 | 6-42 Radiation Safety Report of HIRFL in 2015显示文摘The total operation time of HIRFL is 7 536 h in 2015; the user beam time is about 5 451.5 (from 21 Dec.2014 to 21 Dec. 2015); 4 836 h were used for experiments; 615.5 h were used for accelerator research. There are 26 heavy ions beams were provided by HIRFL in 2015. The highest ions energy provided is 464 MeV/u, the maximum accumulated ion intensity is 1 400 A for carbon ion. | Su Youwu Xu Junkui Li Zongqiang Mao Wang Li Wuyuan Xu Chong Yan Weiwei Pang Chengguo | 2015 | IMP & HIRFL Annual Report2015，，1： | 0 |
| 10 | 6-43 Radiation Monitoring System for Wuwei Heavy Ion Medical Accelerator显示文摘To ensure the radiation safety of the accelerator staff, medical personnel, patients and surrounding residents,radiation monitoring system in the workplace was established at HIMM WuWei.The Radiation monitoring system is composed of monitoring, data acquisition unit and central control computer,the structure shown in Fig. 1. Inside and outside the accelerator radiation area 14 monitoring points were arranged(Fig. 2). A neutron detector and a -ray detector was installed at each monitoring point. | Li Zongqiang Mao Wang Li Wuyuan Xu Junkui Fu Xin Xu Chon Yan Weiwei Su Youwu | 2015 | IMP & HIRFL Annual Report2015，，1： | 0 |
| 11 | Multi-scale simulation model of air system based on cross-dimensional data transmission method显示文摘The Secondary Air System(SAS)plays an important role in the safe operation and performance of aeroengines.The traditional 1D-3D coupling method loses information when used for secondary air systems,which affects the calculation accuracy.In this paper,a Cross-dimensional Data Transmission method(CDT)from 3D to 1D is proposed by introducing flow field uniformity into the data transmission.First,a uniformity index was established to quantify the flow field parameter distribution characteristics,and a uniformity index prediction model based on the locally weighted regression method(Lowess)was established to quickly obtain the flow field information.Then,an information selection criterion in 3D to 1D data transmission was established based on the Spearman rank correlation coefficient between the uniformity index and the accuracy of coupling calculation,and the calculation method was automatically determined according to the established criterion.Finally,a modified function was obtained by fitting the ratio of the 3D mass-average parameters to the analytical solution,which are then used to modify the selected parameters at the 1D-3D interface.Taking a typical disk cavity air system as an example,the results show that the calculation accuracy of the CDT method is greatly improved by a relative 53.88%compared with the traditional 1D-3D coupling method.Furthermore,the CDT method achieves a speedup of 2 to 3 orders of magnitude compared to the 3D calculation. | Lei WANG Junkui MAO Song WEI Longfei WANG Jin PAN | 2023 | Chinese Journal of Aeronautics2023，36，5： | 0 |
| 12 | Monte-Carlo Simulations of Neutron Radiation Field of Heavy Ion Cancer Therapy in IMP显示文摘 | Xu Junkui Su Youwu Li Wuyuan Li Zongqiang Mao Wang | 2011 | IMP & HIRFL Annual Report2011，，1： | 0 |
| 13 | 6-22 Radiation Safety Report of HIRFL in 2014显示文摘The total operation time of HIRFL is 7 272 h in 2014, and the user beam time is about 4 964.5 h(from 21stDec.2013 to 21st Dec. 2014). 3 749 h for physics experiment, 332 h for life science research, 883.5 h for materialscience and single particle effect research, and 235 h for machine research. There are 24 heavy ions beams wereprovided by HIRFL in 2014. The highest ions energy provided is 487 MeV/u, and the maximum accumulated ionintensity is 1 000 A. | Su Youwu Xu Junkui Li Zongqiang Mao Wang Li Wuyuan Xu Chong Yan Weiwei Pang Chengguo | 2014 | IMP & HIRFL Annual Report2014，，1： | 0 |
| 14 | Unsteady analysis of jet impingement under vibration conditions显示文摘The vibration of thermodynamic machinery will affect its cooling system.In this research,a high-resolution simulation of jet impingement was performed to quantify the unsteady turbulent convection under vibration conditions.A newly developed Self-Adaptive Turbulence Eddy Simulation(SATES)method was used.The Reynolds number was Re=23000,the jet-towall distance was fixed at H/D=2,and the vibrating frequency of the impinging wall f varied from 0 to 200 Hz.Compared with the static wall case,the maximum enhancement of the stagnation point and area averaged Nusselt number within r/D=1 could reach up to 5%due to the larger primary vortices,whereas it could reduce the heat transfer by 10%beyond r/D=3 due to the suppression of the wall vortices development.Based on the unsteady analysis and Proper Orthogonal Decomposition(POD)pattern,the modes controlled by vibration were recognized and their contributions to the heat transfer performance were also evaluated.The introduction of the vibration promoted the development of the primary vortices and changed the radial alternating motion to a vertical alternating motion at the wall jet region.The former was beneficial for the heat transfer,while the latter was unfavorable. | Yue YANG Junkui MAO Feilong WANG Xingsi HAN | 2022 | Chinese Journal of Aeronautics2022，35，5： | 0 |
| 15 | Effective Thermal Conductivity for 3D Five-Directional Braided Composites Based on Microstructural Analysis显示文摘A method for predicting effective thermal conductivities(ETCs) of three-dimensional five-directional(3D5D) braided composites is presented. The effective thermal conductivity prediction method contains a digital image processing technology. Multiple scanning electron microscopy(SEM)images of composites are analyzed to obtain actual microstructural features. These actual microstructural features of 3D5D braided composites are introduced into representative volume element(RVE) modeling. Apart from applying actual microstructural features,compression effects between yarns are considered in the modeling of RVE,making the RVE more realistic. Therefore,the ETC prediction method establishes a representative unit cell model that better reflects the true microstructural characteristics of the 3D5D braided composites. The ETCs are predicted with the finite element method. Then thermal conductivity measurements are carried out for a 3D5D braided composite sample.By comparing the predicted ETC with the measured thermal conductivity, the whole process of the ETC prediction method is proved to be effective and accurate,where a relative error of only 2.9 % is obtained.Furthermore,the effects of microstructural features are investigated,indicating that increasing interior braiding angles and fiber fill factor can lead to higher transverse ETCs. Longitudinal ETCs decrease with increasing interior braiding angles,but increase with increasing fiber fill factor. Finally,the influence of variations of microstructure parameters observed in digital image processing are investigated. To explore the influence of variations in microstructural features on variations in predicted ETCs,the actual probability distributions of microstructural features obtained from the 3D5D braided composite sample are introduced into the ETC investigation. The results show that,compared with the interior braiding angle,variations in the fiber fill factor exhibit more significant effects on variations in ETCs. | ZHAO Xiao MAO Junkui JIANG Hua | 2019 | Transactions of Nanjing University of Aeronautics and Astronautics2019，36，1： | 0 |
| 16 | HIRFL2017年辐射安全报告显示文摘The radiation safety and protection facilities of HIRFL mainly include area radiation monitoring system,environmental radiation monitoring system,safety interlock system and shielding bodies.The area radiation monitoring system consists of sixty-five fixed sites.The environmental radiation monitoring system is composed of three automatic monitoring stations and 15 fixed TLDs monitoring sites.The new safety interlock system was putinto operation in Dec.2017. | Su Youwu Xu Junkui Mao Wang Li Zongqiang Li Wuyuan Xu Chong Yan Weiwei Yang Yao | 2017 | IMP & HIRFL Annual Report2017，，1： | 0 |
| 17 | 25 MeV质子直线加速器辐照监测系统显示文摘The 25 MeV proton linear accelerator radiation monitoring system was established and successfully applied to accelerator beam test in 2017.The radiation monitoring system includes radiation detector,data acquisition unit,central progress computer and radiation monitoring software.The structure of this radiation monitoring system is shown in Fig.1.There are 6 monitoring points distributed in the accelerator radiation area and each point is composed by one neutron and one gamma detector,to on-line monitor real time neutron and gamma dose rate level.The parameters of neutron and gamma detector such as measurement range,energy response and sensitivities can meet the requirement of proton linear accelerator radiation monitoring. | Li Zongqiang Mao Wang Liu Haitao Xu Junkui Li Wuyuan Su Youwu | 2017 | IMP & HIRFL Annual Report2017，，1： | 0 |
| 18 | 验证FLIKA程序用于磁铁中能量沉积显示文摘The energy deposition in magnets is an important parameter for the magnets design,especially for those magnets working in a strong radiation environment.A new radioactive ion beam line named HFRS will be built in the HIAF,and RIBs are generated with the projectile fragmentation(PF)method.Secondary particles like neutrons,electrons,photons and other fission products can lead to heat load on the coils. | Yang Yao Li Wuyuan Xu Junkui Yan Weiwei Mao Wang Yang Bo Xu Chong Wang Lijun Su Youwu | 2017 | IMP & HIRFL Annual Report2017，，1： | 0 |
| 19 | 6 - 32 Radiation Safety Reportof HIRFL in 2012显示文摘 | Su Youwu Li Zongqiang LiWuyuan Xu Junkui Mao Wang Xu Chong Yan Weiwei Pang Chengguo | 2012 | IMP & HIRFL Annual Report2012，，1： | 0 |
| 20 | 6 - 33 Design of a Cylindrical Extended Range Neutron Monitor显示文摘 | Li Zongqiang Su Youwu Xu Junkui Mao Wang Xu Chong Li Wuyuan Yan Weiwei | 2012 | IMP & HIRFL Annual Report2012，，1： | 0 |
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