Steady and Unsteady Flow Phenomena in a Channel Diffuser of a Centrifugal Compressor
Steady and Unsteady Flow Phenomena in a Channel Diffuser of a Centrifugal Compressor
复制标题
离心压缩机通道扩压器的稳态和非稳态流动现象
DOI：
10.1299/jsmeb.47.91
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
Shin
中科院分区：
文献类型：
--
作者：
Jeongseek Kang;Shin
本文的目的是了解离心压气机通道扩压器内的时均压力分布和非定常压力模式。从叶轮出口到通道扩压器出口的压力分布进行了测量和讨论的各种流动条件。采用分解法对通道式扩压器内六个快速响应传感器的非定常压力信号进行了分析。叶轮-扩压器相互作用导致扩压器围带壁面压力分布的强烈不均匀性。随着流量的增加，喉部附近的流动分离，由于大的冲角，增加了气动阻塞，并减少了下游的气动流动面积。因此，最小压力位置出现在几何喉部的下游，并将其命名为气动喉部。而在阻塞状态下，正激波发生在该气动喉部下游。讨论了气动喉道位置的变化
The aim of this paper is to understand the time averaged pressure distributions and unsteady pressure patterns in a channel diffuser of a centrifugal compressor. Pressure distributions from the impeller exit to the channel diffuser exit are measured and discussed for various flow conditions. And unsteady pressure signals from six fast-response sensors in the channel diffuser are analyzed by decomposition method. The strong non-uniformity in the pressure distribution is obtained over the diffuser shroud wall caused by the impeller-diffuser interaction. As the flow rate increases, flow separation near the throat, due to large incidence angle, increases aerodynamic blockage and reduces the aerodynamic flow area downstream. Thus the minimum pressure location occurs downstream of the geometric throat, and it is named as the aerodynamic throat. And at choke condition, normal shock occurs downstream of this aerodynamic throat. The variation in the location of the aerodynamic throat is discussed