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| 1 | Numerical study of corner separation in a linear compressor cascade using various turbulence models显示文摘Three-dimensional corner separation is a common phenomenon that significantly affects compressor performance.Turbulence model is still a weakness for RANS method on predicting corner separation flow accurately.In the present study,numerical study of corner separation in a linear highly loaded prescribed velocity distribution(PVD) compressor cascade has been investigated using seven frequently used turbulence models.The seven turbulence models include Spalart–Allmaras model,standard k–e model,realizable k–e model,standard k–x model,shear stress transport k–x model,v^2–f model and Reynolds stress model.The results of these turbulence models have been compared and analyzed in detail with available experimental data.It is found the standard k–e model,realizable k–e model,v^2–f model and Reynolds stress model can provide reasonable results for predicting three dimensional corner separation in the compressor cascade.The Spalart–Allmaras model,standard k–x model and shear stress transport k–x model overestimate corner separation region at incidence of 0°.The turbulence characteristics are discussed and turbulence anisotropy is observed to be stronger in the corner separating region. | Liu Yangwei Yan Hao Liu Yingjie Lu Lipeng Li Qiushi | 2016 | Chinese Journal of Aeronautics2016，29，3： | 11 |
| 2 | A study on turbulence transportation and modification of Spalart–Allmaras model for shock-wave/turbulent boundary layer interaction flow显示文摘It is of great significance to improve the accuracy of turbulence models in shock-wave/ boundary layer interaction flow. The relationship between the pressure gradient, as well as the shear layer, and the development of turbulent kinetic energy in impinging shock-wave/turbulent boundary layer interaction flow at Mach 2.25 is analyzed based on the data of direct numerical simulation(DNS). It is found that the turbulent kinetic energy is amplified by strong shear in the separation zone and the adverse pressure gradient near the separation point. The pressure gradient was non-dimensionalised with local density, velocity, and viscosity. Spalart–Allmaras(S–A) model is modified by introducing the non-dimensional pressure gradient into the production term of the eddy viscosity transportation equation. Simulation results show that the production and dissipation of eddy viscosity are strongly enhanced by the modification of S–A model. Compared with DNS and experimental data, the wall pressure and the wall skin friction coefficient as well as the velocity profile of the modified S–A model are obviously improved. Thus it can be concluded that the modification of S–A model with the pressure gradient can improve the predictive accuracy for simulating the shock-wave/turbulent boundary layer interaction. | Ma Li Lu Lipeng Fang Jian Wang Qiuhui | 2014 | Chinese Journal of Aeronautics2014，27，2： | 9 |
| 3 | Large-eddy simulation of shock-wave/turbulent boundary layer interaction with and without Spark Jet control显示文摘The efficiency and mechanism of an active control device ‘‘Spark Jet' and its application in shock-induced separation control are studied using large-eddy simulation in this paper.The base flow is the interaction of an oblique shock-wave generated by 8° wedge and a spatially-developing Ma = 2.3 turbulent boundary layer.The Reynolds number based on the incoming flow property and the boundary layer displacement thickness at the impinging point without shock-wave is20000.The detailed numerical approaches were presented.The inflow turbulence was generated using the digital filter method to avoid artificial temporal or streamwise periodicity.The numerical results including velocity profile,Reynolds stress profile,skin friction,and wall pressure were systematically validated against the available wind tunnel particle image velocimetry(PIV) measurements of the same flow condition.Further study on the control of flow separation due to the strong shock-viscous interaction using an active control actuator ‘‘Spark Jet' was conducted.The single-pulsed characteristic of the device was obtained and compared with the experiment.Both instantaneous and time-averaged flow fields have shown that the jet flow issuing from the actuator cavity enhances the flow mixing inside the boundary layer,making the boundary layer more resistant to flow separation.Skin friction coefficient distribution shows that the separation bubble length is reduced by about 35% with control exerted. | Yang Guang Yao Yufeng Fang Jian Gan Tian Li Qiushi Lu Lipeng | 2016 | Chinese Journal of Aeronautics2016，29，3： | 8 |
| 4 | Experimental Study of Corner Stall in a Linear Compressor Cascade显示文摘In order to gain a better knowledge of the mechanisms and to calibrate computational fluid dynamics (CFD) tools including both Reynolds-averaged Navier-Stokes (RANS) and large eddy simulation (LES),a detailed and accurate experimental study of corner stall in a linear compressor cascade has been carried out.Data are taken at a Reynolds number of 382 000 based on blade chord and inlet velocity.At first,inlet flow boundary layer is surveyed using hot-wire anemometry.Then in order to investigate the effects of incidence,measurements are acquired at five incidences,including static pressures on both blade and endwall surfaces measured by pressure taps and the total pressure losses of outlet flow measured by a five-hole pressure probe.The maximum losses as well as the extent of losses of the corner stall are presented as a function of the investigated incidences. | MA Wei OTTAVY Xavier LU Lipeng LEBOEUF Francis GAO Feng | 2011 | Chinese Journal of Aeronautics2011，24，3： | 8 |
| 5 | Control of Corner Separation by Optimized Slot Configuration in a Linear Compressor Cascade显示文摘为控制压气机叶片吸力面与端壁处所形成的三维角区分离,本文在叶根处引入了从压力面到吸力面的槽道来控制角区分离流动。基于利用优化算法对叶根处槽道几何的优化结果,本文通过数值模拟和实验来分析槽道在不同进口攻角下对角区分离的控制效果。本文通过对比原始和开槽叶栅中总压损失、静压升和三维角区分离特征表明叶根处引入的槽道对角区分离有明显的控制效果。 | Jinjing Sun Yangwei Liu Lipeng Lu Xavier OTTAVY | 2016 | 风机技术2016，58，6： | 4 |
| 6 | Hydrolysis of cellobiose catalyzed by zeolites—the role of acidity and micropore structure显示文摘The roles of acidity and micropore structure of zeolite were studied in the hydrolysis of the model oligosaccharide of cellulose–cellobiose. HZSM-5, HY, HMOR and Hβ zeolites were selected as model catalysts for the hydrolysis of cellobiose. The effect of acidity of zeolite, including the strength, type and location, on its catalytic activity was investigated. The strong Br?nsted acid sites located in micropores are the active sites for the hydrolysis of cellobiose to glucose. Meanwhile, the catalytic performance of zeolite is also dependent on the micropore size of zeolite. | Lipeng Zhou Zhen Liu Yuqi Bai Tianliang Lu Xiaomei Yang Jie Xu | 2016 | Journal of Energy Chemistry2016，25，1： | 4 |
| 7 | Synthesis of Mesoporous Anatase TiO2 Sphere with High Surface Area and Enhanced Photocatalytic Activity显示文摘Mesoporous anatase TiO_2 spheres with high surface area(119 m^2g^(-1)) were successfully synthesized via a facile and green template-free method. The prepared TiO_2 was characterized by X-ray diffraction(XRD),N_2 adsorption, scanning electron microscopy(SEM), transmission electron microscopy(TEM) and UV–vis absorbance spectra. It was found that the prepared TiO_2 is characterized by pure anatase phase, which shows uniform spheres and has a typical mesostructure with a high specific surface area and a large pore volume. The effects of complexant(acetylacetone) amount, crystallization temperature and calcination temperature were also investigated. Based on the results, a sketch for the preparation of mesoporous TiO_2 was proposed. First, complex formed between tetrabutyl titanate and acetylacetone in ethanol. After introduction of aqueous of ammonia sulfate and urea, hydrolysis of tetrabutyl titanate would occur slowly,and sol of TiO_2 was formed. Then, crystallization proceeded under hydrothermal conditions. Calcination process favored the formation of bigger TiO_2 crystal through combining of the small crystals in TiO_2.This led to the formation of bigger mesopores between TiO_2 crystals. Photocatalytic activity of the prepared TiO_2 was evaluated by decomposition of methyl orange. | Tianliang Lu Youqiang Wang Yingli Wang Lipeng Zhou Xiaomei Yang Yunlai Su | 2017 | Journal of Materials Science & Technology2017，33，3： | 3 |
| 8 | Comprehensive test stand for high-intensity cyclotron development显示文摘A comprehensive test stand for high-intensity cyclotron development,a 10 MeV 430 μA cyclotron,has been successfully constructed at China Institute of Atomic Energy (CIAE) for the experimental verification of the viability of a 100 MeV high-intensity cyclotron (CYCIAE-100) being constructed at CIAE.The verification includes the overall design technology,detail design and engineering technology for the crucial parts of the machine,e.g.main magnet and beam diagnostics.It will also pave the way for future enhancement of the beam intensity.The test stand consists of a H-ion source,axial injection system,central region,main magnet and coil,RF resonator,stripping extraction,and auxiliary systems,which include the RF power amplifier,high voltage and DC power supplies,electric apparatus,beam diagnostics,control,vacuum,water cooling,pneumatic system,and safety interlock.This paper presents the work regarding the design and sub-system development of the test sand,and the results of the beam commissioning of the machine. | ZHANG TianJue LI ZhenGuo CHU ChengJie XING JianSheng GUAN FengPing ZHONG JunQing JI Bin GE Tao YIN ZhiGuo HOU ShiGang PAN GaoFeng YAO HongJuan LU YinLong WANG ZhenHui WU LongCheng LIN Jun JIA XianLu WEI SuMin WEN LiPeng WANG Feng XIA Le CAI HongRu XIE HuaiDong CHEN RongFan ZHANG Yan ZHANG SuPing LIU GengShou ZOU Jian AN ShiZhong YANG JianJun BI YuanJie YANG Fang | 2011 | Chinese Science Bulletin2011，56，3： | 3 |
| 9 | Subgrid-scale contributions to Lagrangian time correlations in isotropic turbulence显示文摘The application of large-eddy simulation(LES)to particle-laden turbulence raises such a fundamental ques-tion as whether the LES with a subgrid scale(SGS)model cancorrectly predict Lagrangian time correlations(LTCs).Mostof the currently existing SGS models are constructed basedon the energy budget equations.Therefore,they are able tocorrectly predict energy spectra,but they may not ensure thecorrect prediction on the LTCs.Previous researches investi-gated the effect of the SGS modeling on the Eulerian timecorrelations.This paper is devoted to study the LTCs in LES.A direct numerical simulation(DNS)and the LES with aspectral eddy viscosity model are performed for isotropicturbulence and the LTCs are calculated using the passivevector method.Both a priori and a posteriori tests are car-ried out.It is observed that the subgrid-scale contributions tothe LTCs cannot be simply ignored and the LES overpredictsthe LTCs than the DNS.It is concluded from the straininghypothesis that an accurate prediction of enstrophy spectrais most critical to the prediction of the LTCs. | Jian Zhang Guowei He Lipeng Lu | 2009 | Acta Mechanica Sinica2009，25，1： | 2 |
| 10 | Large eddy simulation of compressible turbulent channel flow with spanwise wall oscillation显示文摘The influences of the modification of turbulent coherent structures on temperature field and heat transfer in turbulent channel flow are studied using large eddy simulation(LES) of compressible turbulent channel flows with spanwise wall oscillation(SWO).The reliability of the LES on such problems is proved by the comparisons of the drag reduction data with those of other researches.The high consistency of coherent velocity structures and temperature structures is found based on the analyses of the turbulent flow field.When the coherent velocity structures are suppressed,the transportations of momentum and heat are reduced simultaneously,demonstrating the same trend.This shows that the turbulent coherent structures have the same effects on the transportations of momentum and heat.The averaged wall heat flux can be reduced with appropriate oscillating parameters. | FANG Jian LU LiPeng SHAO Liang | 2009 | Science China(Physics,Mechanics & Astronomy)2009，52，8： | 2 |
| 11 | Redox-responsive biocompatible nanocarriers based on novel heparosan polysaccharides for intracellular anticancer drug delivery显示文摘Heparosan is a natural precursor of heparin biosynthesis in mammals. It is stable in blood circulation but can be degraded in lysosomes, showing good biocompatibility and long circulation features. So heparosan can be designed as anticancer drug carriers to increase tumor selectivity and improve the therapeutic effect. A novel redox-sensitive heparosancystamine-vitamin E succinate(KSV) micelle system was constructed for intracellular delivery of doxorubicin(DOX). Simultaneously, the redox-insensitive heparosan-adipic acid dihydrazide-vitamin E succinate copolymer(KV) was synthesized as control. DOX-loaded micelles(DOX/KSV) with an average particle size of 90–120 nm had good serum stability and redox-triggered depolymerization. In vitro drug release test showed that DOX/KSV micelles presented obvious redox-triggered release behavior compared with DOX/KV. Cytotoxicity and cell uptake were investigated using MGC80-3 tumor cells and COS7 fibroblast-like cells. The cell survival rate of blank micelles was more than 90%, and the cytotoxicity of DOX/KSV in MGC80-3 cells was higher than in COS7 cells, indicating that the carrier has better biocompatibility and less toxicity side effect. The cytotoxicity of DOX/KSV against MGC80-3 cells was significantly greater than that of free DOX and DOX/KV. Furthermore, compared with DOX/KV in MGC80-3 cells, DOX/KSV micelles uptook more anticancer drugs and then released DOX faster into the cell nucleus. The micelles were endocytosed by multiple pathways, but clathrin-mediated endocytosis was the main pathway. Therefore, heparosan polysaccharide could be a potential option as anticancer carrier for enhancing efficacy and mitigating toxicity. | Lipeng Qiu Lu Ge Miaomiao Long Jing Mao Kamel SAhmed Xiaotian Shan Huijie Zhang Li Qin Guozhong Lv Jinghua Chen | 2020 | Asian Journal of Pharmaceutical Sciences2020，15，1： | 2 |
| 12 | A theoretical model for Reynolds-stress and dissipation-rate budgets in near-wall region显示文摘 | Lipeng Lu Maozhang Chen | 2000 | Science in China Series A: Mathematics2000，，2： | 1 |
| 13 | The effect of pressure gradient on the coherent structures in a turbulent boundary layer显示文摘 | Zhou Heng Lu Lipeng | 1997 | Science in China Series A1997，40，4： | 1 |
| 14 | A theoretical model for Reynolds-stress and dissipation-rate budgets in near-wall region显示文摘 | Lu Lipeng Chen Maozhang | 2000 | Science in China Series A2000，43，2： | 1 |
| 15 | The Analysis of Flow around a 2-D Airfoil at Low Reynolds Number 显示文摘 | Ye Jian Lin Guohua Zou Zhengping Lu Lipeng | 2002 | Journal of Aerospace Power2002，18，1： | 1 |
| 16 | Modification of spalart-allmaras model with consideration of turbulence energy backscatter using velocity helicity显示文摘 | Liu Yangwei Lu Lipeng Fang Le | | 0，，24： | 1 |
| 17 | Effect of pressure gradient on coherent structures in a turbulent boundary layer显示文摘 | Heng Zhou Lipeng Lu | 1997 | Science in China Series A: Mathematics1997，，4： | 1 |
| 18 | Identification of a SARS-CoV-2 virus-encoded small non-coding RNA in association with the neurological disorders in COVID-19 patients显示文摘Dear Editor,Coronavirus disease 2019(covid-19),caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2),has led to 460 million cases confirmed and 6.1 million deaths across almost 200 countries until March 2022.In addition to the vaccine-based protection against viral infection,it is urgently needed to accurately diagnose covid-19 patients as early as possible after infection. | Qian Zhao Qiong Wang Bing Zhao Yixing Wang Jinhui Lü Yuefan Guo Xiaoping Zhu Lu Qian Shanshan Yu Lipeng Hao Zhongmin Liu Zuoren Yu | 2022 | Signal Transduction and Targeted Therapy2022，7，4： | 1 |
| 19 | Modification of Spalart–Allmaras model with consideration of turbulence energy backscatter using velocity helicity显示文摘 | Yangwei Liu Lipeng Lu Le Fang Feng Gao | 2011 | Physics Letters A2011，，24： | 1 |
| 20 | Non-equilibrium turbulent phenomena in the ?ow over a backward-facing ramp显示文摘Non-equilibrium turbulence phenomena have raised great interests in recent years. Significant efforts have been devoted to non-equilibrium turbulence properties in canonical flows, e.g., grid turbulence, turbulent wakes, and homogeneous isotropic turbulence(HIT). The non-equilibrium turbulence in non-canonical flows, however, has rarely been studied due to the complexity of the flows. In the present contribution, a directnumerical simulation(DNS) database of a turbulent flow is analyzed over a backwardfacing ramp, the flow near the boundary is demonstrated, and the non-equilibrium turbulent properties of the flow in the wake of the ramp are presented by using the characteristic parameters such as the dissipation coefficient C and the skewness of longitudinal velocity gradient Sk, but with opposite underlying turbulent energy transfer properties. The equation of Lagrangian velocity gradient correlation is examined, and the results show that non-equilibrium turbulence is the result of phase de-coherence phenomena, which is not taken into account in the modeling of non-equilibrium turbulence. These findings are expected to inspire deeper investigation of different non-equilibrium turbulence phenomena in different flow conditions and the improvement of turbulence modeling. | Le FANG Hongkai ZHAO Weidan NI Jian FANG Lipeng LU | 2019 | Applied Mathematics and Mechanics(English Edition)2019，40，2： | 1 |
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