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| 1 | The Effect of Variable Stator on Performance of a Highly Loaded Tandem Axial Flow Compressor Stage显示文摘Increasing the aerodynamic load on compressor blades helps to obtain a higher pressure ratio in lower rotational speeds.Considering the high aerodynamic load effects and structural concerns in the design process,it is possible to obtain higher pressure ratios compared to conventional compressors.However,it must be noted that imposing higher aerodynamic loads results in higher loss coefficients and deteriorates the overall performance.To avoid the loss increase,the boundary layer quality must be studied carefully over the blade suction surface.Employment of advanced shaped airfoils(like CDAs),slotted blades or other boundary layer control methods has helped the designers to use higher aerodynamic loads on compressor blades.Tandem cascade is a passive boundary layer control method,which is based on using the flow momentum to control the boundary layer on the suction surface and also to avoid the probable separation caused by higher aerodynamic loads.In fact,the front pressure side flow momentum helps to compensate the positive pressure gradient over the aft blade's suction side.Also,in comparison to the single blade stators,tandem variable stators have more degrees of freedom,and this issue increases the possibility of finding enhanced conditions in the compressor off-design performance.In the current study,a 3D design procedure for an axial flow tandem compressor stage has been applied to design a highly loaded stage.Following,this design is numerically investigated using a CFD code and the stage characteristic map is reported.Also,the effect of various stator stagger angles on the compressor performance and especially on the compressor surge margin has been discussed.To validate the CFD method,another known compressor stage is presented and its performance is numerically investigated and the results are compared with available experimental results. | Hamzeh Eshraghi Masoud Boroomand Abolghasem M.Tousi Mohammad Toude Fallah Ali Mohammadi | 2016 | Journal of Thermal Science2016，25，3： | 3 |
| 2 | 某型航空压气机振动特性分析显示文摘压气机是涡喷发动机的重要工作部件之一,简单介绍了航空涡喷发动机压气机的结构特点和其主要功能;运用CATIA三维建模软件建立了某型航空发动机压气机的三维实体模型,运用软件ANSYS Workbench对建立的模型进行模态分析,得到其前8阶固有频率和振型,根据计算结果分析了压气机的振动特性,为该型号压气机的结构优化和动力修改提供了参考依据。 | 黄杰 蒋玲莉 徐曼 | 2016 | 机械工程与自动化2016，，5： | 0 |
| 3 | Stator re-stagger optimization in multistage axial compressor显示文摘As a widely applied technique in multistage axial compressors,variable stator vanes(VSV)can flexibly rematch the blade rows to fulfil a variety of aerodynamic performance requirements,such as high efficiency and wide surge margin.The purpose of this paper is to develop an optimization method to quickly determine VSV settings during the preliminary design phase.A mean-line method with a model calibration procedure is adopted to evaluate compressor performance,and the NSGA-II algorithm is employed for automatic optimization.The developed optimization system is then employed to determined re-stagger arrangement in a multistage compressor.A single-speed optimization with performance constraints of specific operating point and a multi-speed optimization with different control laws are conducted.Results are compared with available experimental re-stagger scheme,which verifies the effectiveness of the re-stagger optimization method.Moreover,method is proposed to determine operating parameters of a working point with a user-defined pressure ratio or mass flow rate after variable geometry. | Jinguang Yang Min Zhang Cheng Peng Michele Ferlauto Yan Liu | 2021 | Propulsion and Power Research2021，10，2： | 0 |
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