摘要
离心式压缩机中叶片扩压器叶片和旋转叶轮间流动存在动静干涉,易出现流动不稳定现象。模态分解方法用于提取出动态流场中相关的模态流场信息。本文在离心式压缩机叶片扩压器动态流场应用动态模式分解方法,对速度场提取模态并进行分析,结果表明:叶片扩压器近盘盖侧涡结构运动规律不同,90%叶高平面涡沿着叶片压力面向下游运动并很快耗散,而在10%叶高平面涡会进入通道造成流动不稳定。随着流量减小,10%叶高面上叶片吸力面尾缘产生大尺度涡并脱落,进一步加剧盘侧截面恶劣的流通情况。
The rotor-stator interaction of rotating impeller and vaned diffuser often cause the unsteady flow.The model decomposition method can be used to extract the coherent structures.In this paper,the dynamic mode decomposition method is applied to extract and analyze the dynamic modes of velocity field of vaned diffuser in centrifugal compressor.The result shows the movement rules of the vortex at close to the shroud spans in vaned diffuser which the vortex of 90%vane height moves downstream along the vane pressure surface and disappears quickly,the vortex of 10%vane height enter the flow passage cause the flow unsteady.As the flow rate decrease,the large scale vortex come out and disappeared in the suction surface trailing edge of 10%vaned height that the flow condition in the blade side become deteriorates.
作者
奚铭铮
邵昱昌
薛翔
王彤
Ming-zheng Xi;Yu-chang Shao;Xiang Xue;Tong Wang(School of Mechanical Engineering,Shanghai Jiao Tong University)
出处
《风机技术》
2018年第1期23-27,共5页
Chinese Journal of Turbomachinery
基金
国家自然科学基金项目51276108
关键词
离心压缩机
叶片扩压器
动态模式分解
centrifugal compressor
vaned diffuser
dynamic mode decomposition
