摘要
为了探究涡轮轴发动机离心叶轮分流叶片周向位置对其气动阻尼的影响。通过有限元仿真的方法,对涡轮轴发动机叶轮进行了模态分析和气动激振力作用下的谐响应分析,确定叶轮叶片在特定频率内的振动形式。建立基于叶轮结构的气动阻尼仿真模型,通过数值计算的方法,获得并分析分流叶片在不同周向位置时的叶轮气动阻尼。计算结果表明:计算获得的气动阻尼和机械阻尼量级相同,在特定分析中不能忽略。分流叶片周向位置对叶轮气动阻尼有显著影响。分流叶片不偏置时气动阻尼最小,可以通过偏置分流叶片的方法提升叶轮的气动弹性稳定性。
In order to study the influence of circumferential position on aerodynamic damping of centrifugal impellers splitter blade in turboshaft engine,modal analysis and harmonic response analysis under the action of aero dynamic force were made to obtain the vibration form of a turboshafts engine impeller blade at specific frequency.A simulation model of aerodynamic damping was established based on impeller structure,and by using numerical calcu lation method,aerodynamic dampings of the impeller at different circumferential positions were obtained and then a-nalysised.The result shows that the calculated aerodynamic damping and mechanical damping are in the same level,the aerodynamic damping can not be ignored in a specific analysis,circumferential position of split blade has a signif icant influence on the aerodynamic damping of the blade,aerodynamic damping is minimum when splitter is unbi ased,and aerodynamic stability of the impeller can be improved by the method of bias shunting blade.
作者
王延忠
齐荣华
WANG Yan-zhong;QI Rong-hua(School of Mechanical Engineering and Automation,Beihang University,Beijing 100191,China)
出处
《计算机仿真》
北大核心
2019年第6期77-82,共6页
Computer Simulation
基金
国防基础科研项目(JCKY2016220XXXX)
关键词
分流叶片
气动阻尼
涡轮轴发动机
周向位置
Split blade
Aerodynamic damping
Turboshaft engine
Circumferential position
