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| 1 | Numerical Investigations on the Steady and Unsteady Leakage Flow and Heat Transfer Characteristics of Rotor Blade Squealer Tip显示文摘The steady and unsteady leakage flow and heat transfer characteristics of the rotor blade squealer tip were conducted by solving Reynolds-Averaged Navier-Stokes(RANS) equations with k-ω turbulence model.The first stage of GE-E3 engine with squealer tip in the rotor was adopted to perform this work.The tip clearance was set to be 1% of the rotor blade height and the groove depth was specified as 2% of the span.The results showed that there were two vortexes in the tip gap which determined the local heat transfer characteristics.In the steady flow field,the high heat transfer coefficient existed at several positions.In the unsteady case,the flow field in the squealer tip was mainly influenced by the upstream wake and the interaction of the blades potential fields.These unsteady effects induced the periodic variation of the leakage flow and the vortexes,which resulted in the fluctuation of the heat transfer coefficient.The largest fluctuation of the heat transfer coefficient on the surface of the groove bottom exceeded 16% of the averaged value on the surface of the squealer tip. | Jun LI Hao SUN Jinshan WANG Zhenping FENG | 2011 | Journal of Thermal Science2011，20，4： | 9 |
| 2 | Regional path moving horizon tracking controller design for autonomous ground vehicles显示文摘A novel regional path tracking description is presented in this manuscript, and the moving horizon control method that is model predictive control(MPC) is proposed to discuss the regional path tracking issue which could avoid colliding road boundary when tracking a more complex road effectively. The feasible region for autonomous ground vehicles(AGVs) running is determined first according to the detected road boundaries.Then, in order to keep the actual trajectory of AGVs in the region and satisfy the safety requirements, MPC method is employed to design the path tracking controller considering actuator and road boundary constraints.In order to verify the effectiveness of the proposed method, experiments based on Hongqi AGV HQ430 are carried out, and the results illustrate that the presented method could be successfully applied to Hongqi AGV vehicle HQ 430. | Hongyan GUO Feng LIU Ru YU Zhenping SUN Hong CHEN | 2017 | Science China(Information Sciences)2017，60，1： | 9 |
| 3 | Study on leakage flow characteristics of radial inflow turbines at rotor tip clearance显示文摘Tip clearance leakage flow in a radial inflow turbine rotor for microturbines under the stage environment is investigated using a three-dimensional viscous flow simulation. The results indicate that the scraping flow caused by relative motion between casing and rotor tip, and the pressure difference between pressure side and suction side at rotor tip, play important roles in tip clearance leakage flow. The more the rotor tip speed increases and tip clearance height decreases, the more the scraping effect acts. Though the leakage velocity of tip clearance at midsection and exducer regions changes less when the rotor rotational speed is changing, the distance between passage vortex and rotor suction side varies in evidence. Main leakage flow rate of tip clearance takes place at region of exducer tip and some seal configurations will be quite effective for cutting leakage flow if these configurations are arranged over midsection and exducer of the radial inflow rotor. | DENG QingHua NIU JiuFang FENG ZhenPing | 2008 | Science China(Technological Sciences)2008，51，8： | 6 |
| 4 | Aerodynamic Optimum Design of Transonic Turbine Cascades Using Genetic Algorithms显示文摘This paper presents an aerodynamic optimum design method for transonic turbine cascades based on the Genetic Algorithms coupled to the inviscid flow Euler solver and the boundary-layer calculation.The Genetic Algorithms control the evolution of a population of cascades towards an optimum design.The fitness value of each string is evaluated using the flow solver. The design procedur6 has been developed and the behavior of the genetic algorithms has been tested. The objective functions of the design examples are the minimum mean-square deviation between the aimed pressure and computed pressure and the minimum amount of user expertise. | Li Jun Feng Zhenping Chang Jianzhong Shen Zuda(Institute of Turbomachinery, School of Energy & Power Engineering, Xi’an Jiaotong University,Xi’an, Shaanxi, 710049, China) | 1997 | Journal of Thermal Science1997，6，2： | 6 |
| 5 | Engineering three-layer core–shell S-1/TS-1@dendritic-SiO_(2) supported Au catalysts towards improved performance for propene epoxidation with H_(2) and O_(2)显示文摘The advocacy of green chemical industry has led to the development of highly efficient catalysts for direct gas-phase propene epoxidation with green,sustainable and simple essence.The S-1/TS-1@dendritic-SiO_(2) material with three-layer core–shell structure was developed and used as the support for Au catalysts,which showed simultaneously fantastic PO formation rate,PO selectivity and stability(over 100 h)for propene epoxidation with H_(2) and O_(2).It is found that silicalite-1(S-1)core and the middle thin layer of TS-1 offer great mass transfer ability,which could be responsible for the excellent stability.The designed dendritic SiO_(2) shell covers part of the acid sites on the external surface of TS-1,inhibiting the side reactions and improving the PO selectivity.Furthermore,three kinds of SiO_(2) shell morphologies(i.e.,dendritic,net,mesoporous shell)were designed,and relationship between shell morphology and catalytic performance was elucidated.The results in this paper harbour tremendous guiding significance for the design of highly efficient epoxidation catalysts. | Zhaoning Song Juncong Yuan Zhenping Cai Dong Lin Xiang Feng Nan Sheng Yibin Liu Xiaobo Chen Xin Jin De Chen Chaohe Yang | 2020 | Green Energy & Environment2020，5，4： | 3 |
| 6 | Transonic flow of moist air around an NACA 0012 airfoil with non-equilibrium condensation显示文摘The classical condensation model of water vapor is coupled with the Euler equations to calculate transonic flows of moist air with non-equilibrium condensation. By means of this model, numerical computations are implemented to investigate the aerodynamic characteristics of an NACA 0012 airfoil in transonic flows of moist air at various angles of attack and relative humidities, and the results are compared with those in dry air flows. For different angles of attack considered at 50% relative humidity, the lift decreases 30%—40%. The pressure drag increases when the angle of attack is smaller than 1.4° and decreases when higher than 1.4°. At zero angle of attack, with the relative humidity rising from zero to 90%, the pressure drag increases exponentially. At 90% relative humidity, the pressure drag increases 160%, and self-oscillation takes place periodically and alternately over the upper and lower surfaces of the airfoil. The oscillation is caused by the interactions of local supersonic flow and heat release in the condensation process. | LI Liang SUN Xiuling FENG Zhenping LI Guojun | 2005 | Progress in Natural Science:Materials International2005，15，9： | 2 |
| 7 | Aerodynamic inverse design optimization for turbine cascades based on control theory显示文摘Based on control theory,adjoint system for the general problem of turbomachinery aerodynamic optimization was studied and developed in the present paper by using the variation technique in the grid node coordinates combined with Jacobian Matrics of flow fluxes.Then the adjoint system for aerodynamic design optimization of turbine cascade governed by compressible Navier-Stokes equations was derived in detail.With the purpose of saving computation resources,the mathematic method presented in this paper avoids the coordinate system transforming in the traditional derivation process of the adjoint system and makes the adjoint system much more sententious.Given the general expression of objective functions consisting of both boundary integral and field integral,the adjoint equations and their boundary conditions were derived,and the final expression of the objective function gradient including only boundary integrals was formulated to reduce the CPU cost,especially for the complex 3D configurations.The adjoint system was solved numerically by using the finite volume method with an explicit 5-step Runge-Kutta scheme and Riemann approximate solution of Roe's scheme combined with multi-grid technique and local time step to accelerate the convergence procedure.Finally,based on the aerodynamic optimization theory in the present work,2D and 3D inviscid and viscous inverse design programs of axial turbomachinery cascade for both pressure distribution and isentropic Mach number distribution on the blade wall were developed,and several design optimization cases were performed successfully to demonstrate the ability and economy of the present optimization system. | FENG ZhenPing LI HaiTao SONG LiMing LI YingChen | 2013 | Science China(Technological Sciences)2013，56，2： | 2 |
| 8 | A k-ε Turbulence Model Considering Compressibility in Three-Dimensional Transonic Turbulent Flow Calculation显示文摘Based on the standard k-ε turbulence model, a new compressible k-ε model considering the pressure expansion influence due to the compressibility of fluid is developed and applied to the simulation of 3D transonic turbulent flows in a nozzle and a cascade. The Reynolds avenged N-S equations in generalized curvilinear coordinates are solved with implementation of the new model. The high resolution TVD scheme is used to discretize the convective terms. The numerical results show that the compressible k-ε model behaves well in the simulation of transonic internal turbulent flows. | Guojun LI Zhenping FENG Moujin ZhANG Liang LI (School of Energy & Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China) | 2000 | Journal of Thermal Science2000，9，2： | 2 |
| 9 | Numerical investigation on the self-excited oscillation of wet steam flow in a supersonic turbine cascade显示文摘自我刺激的流动摆动在在湿蒸气汽轮机的冷凝作用过程期间由于特定的超级批评的热增加是一个重要问题。与一个 Eulerian/Eulerian 模型一起,在超声的汽轮机串联的湿蒸气流动的自我刺激的摆动被调查。合适的入口 supercooling 在蒸气汽轮机的串联从稳定的流动导致转变到自我刺激的震荡流动。入口 supercooling 上的频率相关性不是单音的补品。流动摆动导致入口和插头团流动率的异步的期刊变化。片上的空气动力学的力量由于自我刺激的流动摆动周期性地变化。与在 18.1-80-64 Hz 之间的频率谎言,震荡的流动是容易的在一个共振的模式由于定子转子相互作用与入口 supercooling 的期刊变化行动,并且在片上导致更大的空气动力学的力量。在震荡的流动的损失在稳定的流动与那相比增加 20.64% 。 | LI Liang SUN Xiuling LI Guojun FENG Zhenping | 2006 | Progress in Natural Science:Materials International2006，16，9： | 2 |
| 10 | AERODYNAMIC OPTIMIZATION DESIGN OF LOW ASPECT RATIO TRANSONIC TURBINE STAGE显示文摘作为适应范围称为微分进化(ARDE ) 的先进优化方法被开发。ARDE 的优化表演用典型数学测试并且与标准基因算法和微分进化相比被表明。与平行 ARDE,表面建模方法和海军司烧答案结合了,一个新自动空气动力学的优化方法被介绍。低方面比率接近音速的汽轮机舞台总共与 41 个设计变量为 isentropic 效率的最大化被优化。纹理粗糙的平行策略被使用用 15CPUs 加速设计过程。最佳设计的 isentropic 效率比参考设计的高是 1.6% 。最佳的设计的空气动力学的性能比引用设计的好一些。 | SONG Liming LI Jun FENG Zhenping | 2006 | Chinese Journal of Mechanical Engineering2006，19，4： | 2 |
| 11 | Synthetical Numerical Model for Evaluating Blade Fatigue Life of Liquid Corrosion in Steam Turbine显示文摘 | Yonghui Xie Di Zhang Zhenping Feng Bi Sun | 2006 | Key Engineering Materials2006，324，： | 1 |
| 12 | Investigations on Aero- dynamic Performance of Turbine Cascade at Different Flow Condi- tions显示文摘 | SUN Hao LI Jun FENG Zhenping | 2012 | Engineering Applications of Computational Fluid Me- chanics2012，6，2： | 1 |
| 13 | Effects of Variable Jet Nozzle Angles on Cross-Flow Suppression and Heat Transfer Enhancement of Swirl Chamber显示文摘This paper investigated the effects of variable jetting nozzle angles on the cross-flow suppression and heat transfer enhancement of swirl cooling in gas turbine leading edge. The swirl chamber with vertical jet nozzles was set as the baseline, and its flow fields and heat transfer characteristics were analyzed by 3D steady state Reynolds-averaged numerical methods to reveal the mechanism of cross-flow weakening the downstream jets and heat transfer. On this basis, the flow structure on different cross sections and heat transfer characteristics of swirl chamber with variable jetting nozzle angels were compared with the baseline swirl chamber. The results indicated that for the baseline swirl chamber the circumferential velocity gradually decreased and the axial velocity gradually increased, and the cross-flow gradually formed. The cross-flow deflected the downstream jets and drawn them to the center of the chamber, thus weakening the heat transfer. For swirl chamber with variable jetting nozzle angles, the air axial velocity is axial upstream, opposite to the mainstream, so that the impact effects of cross-flow on the jets were reduced, and the heat transfer was enhanced. Furthermore, with the increase of axial velocity along the swirl chamber, the jetting nozzle angle also gradually increased, as well as the effect of cross-flow suppression, which formed a relative balance. For all swirl chambers with variable jet nozzle angles, the thermal performance factors were all larger than 1, which indicated the heat transfer was enhanced with less friction increment. | XIAO Kun HE Juan FENG Zhenping | 2022 | Journal of Thermal Science2022，31，1： | 1 |
| 14 | Particle deposition patterns on high-pressure turbine vanes with aggressive inlet swirl显示文摘Characteristics of particle migration and deposition were numerically investigated in presence of aggressive swirl at the turbine inlet.The isolated effects of the inlet swirl were considered in detail by shifting the circumferential position of the swirl and by implementing positive and negative swirling directions.Particles were released from the turbine inlet and the resulting deposition on the vanes was determined by using the critical velocity model in a range of particle diameters from 1 to 25 lm.Results show that the particles are more likely to move outwards to the boundary walls of the passage by the action of the swirling flow.However,this could be relieved by increasing the particle size.An imbalance problem of the deposition is found between the adjacent vanes,which could introduce additional inlet non-uniformities towards the downstream rotor and thus accelerate performance degradation of the turbine stage.Overall,the negative swirl case has higher overall capture efficiency within the entire turbine than the positive swirl case for larger particles,and when the inlet swirl is shifted to the mid-passage of the turbine,more deposits could be produced in comparison with the case in which the swirl aims at the vane leading edge. | Xing YANG Zihan HAO Zhenping FENG | 2022 | Chinese Journal of Aeronautics2022，35，3： | 1 |
| 15 | The effects of clearance sizes on labyrinth brush seal leakage performance using a reynolds-averaged navier-stokes solver and non-darcian porous medium model 显示文摘 | LI Jun OBI S FENG Zhenping | 2009 | Journal of Power and Energy2009，223，： | 1 |
| 16 | Investiga- lions on aerodynamic performance of turbine cascade at different flow conditions 显示文摘 | SUN Hao LI Jun FENG Zhenping | 2012 | Engineering Applica- lions of Computational Fluid Mechanics2012，6，2： | 1 |
| 17 | Healing effectiveness of cracks rehabilitation in reinforced concrete using electrodeposition method显示文摘 | Zhengwu Jiang Feng Xing Zhenping Sun Peiming Wang | 2008 | Journal of Wuhan University of Technology-Mater Sci Ed2008，，6： | 1 |
| 18 | Investigations on the Rotordynamic Characteristics of a Hole-Pattern Seal Us- ing Transient CFD and Periodic Circular Orbit Model 显示文摘 | YAN Xin LI Jun FENG Zhenping | 2011 | ASME Journal of Vibration and Acoustics2011，133，04： | 1 |
| 19 | Study on Flow Characteristics of a Turbulent Boundary Layer and Vortex Structure of High Pressure Guide Vanes in SCO_2 Turbines显示文摘In order to further understand the aerothermodynamic performance and flow loss mechanism of SCO_2 turbines, RANS equations and an SST Turbulence Model were chosen for a numerical study on the secondary flow and vortex structure of cascades using the commercial software CFX. The dimensionless vorticity analysis method was used to study the flow characteristics of the logarithmic layer and viscous sublayer in high pressure guide vane cascades. The new vortex structure and formation mechanism of the vortices were given and analyzed. Simulation results indicated that during the motion of the boundary layer in the cascades, the logarithmic layer and viscous sublayer obtain the different rotational direction vorticity, respectively. The endwall logarithmic layer and pressure side leg of the horseshoe votex gradually develop into the passage vortex, with the endwall viscous sublayer gradually developing into the corner viscous sublayer vortex II and the endwall viscous sublayer vortex I. The endwall viscous sublayer that rolled by the passage vortex is encountered with the upstream-side and radial boundary layer of the vane at the suction separation line, forming the suction separation line vortex beside the passage vortex. A pair of radial transition vortices are formed between the wake and the main stream. | HAN Wanlong WANG Yueming FENG Zhenping LI Hongzhi YAO Mingyu ZHANG Yifan | 2019 | Journal of Thermal Science2019，28，3： | 1 |
| 20 | Investigations of the conjugate heat transfer and windage effect in stepped labyrinth seals显示文摘 | Kun He Jun Li Xin Yan Zhenping Feng | 2012 | 2012 (17-1)2012，，： | 1 |
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