摘要
为了研究小型变几何涡轮转速与安装角匹配调节对涡轮性能的影响,其中包括研究小型变几何涡轮不同转速变化对涡轮反力度和效率的影响以及在设计转速下不同涡轮导叶安装角工作状态下,涡轮流量系数与效率随膨胀比的变化趋势,以组合动力装置IPU用小型变几何涡轮为研究对象,采用ICEM CFD和Turbo-grid软件分别对涡轮导叶和转子叶片进行网格划分,数值仿真模型计算域包括涡轮进口、导叶、动叶和涡轮出口。结果表明:通过涡轮转速调整,可以减弱安装角变化对涡轮效率的影响;随着导叶安装角增大,最优匹配工况的膨胀比逐渐降低,可很好地配合APU与EPU共用变几何涡轮的工作;可以通过转速与安装角匹配调节,明显提高变几何涡轮的变工况性能,涡轮流量在-17.2%~+33.2%的变化过程中,效率下降不超过0.03。
The study on the effect of the matching adjustment of the rotation speed of the small variable geometry turbine and the installation angle on the turbine performance was proposed,in which the peffect of different rotation speed changes of the small variable geometry turbine on the reaction force,efficiency of the turbine,the different turbine guide vane installation angles at the design speed,and the change trend of turbine flow coefficient and efficiency with expansion ratio were analyzed.With the small variable geometry turbine for the IPU of the combined power plant as the research object,the turbine guide vane and rotor blade were meshed by ICEM CFD and Turbo-grid software respectively.The calculation domain of the numerical simulation model includes the turbine inlet,guide vane,moving blade and turbine outlet.The results show that the effect of the installation angle change on the turbine is efficiency can be reduced through the adjustment of turbine speed.As the guide vane installation angle increased,the expansion ratio of the optimal matching condition is gradually reduced,which can well cooperate with the APU and EPU common change.And the turbine can be adjusted by matching the rotation speed and the installation angle,which can significantly improve the variable operating performance of the variable geometry turbine.During the process of turbine flow change from-17.2%~+33.2%,the efficiency drop does not exceed 0.03.
作者
蒋海明
徐亮
张宜奎
钟易成
JIANG Haiming;XU Liang;ZHANG Yikui;ZHONG Yicheng(AVIC/Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration,Nanjing Engineering Institute of Aircraft Systems,Nanjing 211102,China;College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《机械制造与自动化》
2021年第3期49-53,共5页
Machine Building & Automation
基金
航空科学基金资助项目(20172852025)。
关键词
变几何涡轮
数值仿真
匹配调节
变工况
variable geometry turbine
numerical simulation
adjustment by matching
variable operating performance
