离心叶轮近失速工况内部流场的数值分析

【作者】 王伟； 王彤； 张楠； 谷传纲；

【机构】 上海交通大学机械与动力工程学院；

【摘要】 离心压缩机稳定性分析一直是叶轮机械研究的难点和热点。本文以国内某工程用离心压缩机为研究对象,采用商用软件ANSYS-CFX选用SST湍流模型,对压缩机离心叶轮及无叶扩压器内部流动通道进行三维造型,采用三维定常与非定常计算方法,得到该叶轮的性能曲线和内部流场的基本特征。进而对其在小流量状况下叶顶间隙的非稳定流动特性进行了分析,对比了两种非定常计算方法:一种为出口边界都给定常值的非定常计算;另一种为出口压力边界设置为随时间增加,逐渐逼近失速的非定常计算,所得到的结论有助于分析其非稳定流动的发展规律。更多还原

【Abstract】 Stability Analysis on centrifugal compressor systems is one of the hot spot problems in turbomachinery studies.Based on a centrifugal impeller,both of steady and unsteady numerical simulation were carried out by ANSYS-CFX with SST turbulent model to analyze the performance and the basic internal flow phenomenon.It was found that there existed critical area near shroud tip which may result in the flow instability.In addition,an unsteady computational method with increasing back pressure boundary condition was proposed to investigate the unsteady process approaching to the numerical stall point or unstable flow.The developing parameters are useful for further research unsteady flow process approaching to stall.更多还原