Unstable flow in centrifugal fans
Unstable flow in centrifugal fans
复制标题
离心风机流动不稳定
DOI：
10.1115/1.2817490
复制
发表时间：
1996
期刊：
影响因子：
--
通讯作者：
H. C. Simpson
中科院分区：
文献类型：
--
作者：
P. Chen;M. Soundra;A. N. Bolton;H. C. Simpson
本文研究了进口叶片控制离心通风机的旋转失速和进口涡流。综述了航空发动机压气机失速研究的最新进展。目前的研究表明，在离心风机失速可以很大的不同，在轴流压缩机，失速可以发生在一个渐进的和间歇的方式。研究还表明，风扇特性的不连续性不一定伴随着旋转失速，不像轴流机器。实验结果表明，进口叶片产生的正预旋有利于延迟失速的发生。另外，用于控制进口涡的背鳍装置似乎不会对失速点产生不利影响。发现即使使用背鳍，入口涡频率也总是与流量呈线性关系。这为区分进口涡和旋转失速提供了一种实用的方法。
Rotating stall and the inlet vortex in centrifugal fans with inlet vane control has been studied. The advances in stall research in aero-engine compressors are discussed. The present study shows that stall in centrifugal fans can be quite different from that in axial compressors, in that stall can occur in a progressive and intermittent fashion. The study also shows that a discontinuity in the fan characteristic is not necessarily accompanied by rotating stall, unlike the axial machines. Experimental results indicate that the positive prewhirl created by inlet vanes tends to delay the occurrence of stall. Also, dorsal fin devices that are used to control the inlet vortex do not seem to affect the stall point unfavorably. The inlet vortex frequency was found to invariably exhibit a linear relation with the flow rate even when dorsal fins were used. This offers a practical method to distinguish between the inlet vortex and rotating stall.