摘要
采用数值研究方法并结合实验数据系统地研究了马赫数对离心压缩机小流量系数基本级性能的影响,对基本级内的流动损失机理及马赫数对静止部件性能进行分析。研究结果表明由于小流量系数基本级具有较窄的轴向通道宽度,边界层堵塞效应在小流量系数基本级损失机理中起到关键作用。在马赫数比较小时随马赫数的增加级性能显著提高,达到一定的马赫数后基本级性能又随着马赫数增加而下降。无叶扩压器和回流器的性能受各自进口绝对马赫数的影响很小,静止部件的性能主要受各个部件的进口气流角以及相对宽度的影响。
Abstract： Narrow flow channel typically generate considerable efficienly losses in centrifugal compressor stages. The performances of two centrifugal compressor model stages with low flow coefficients are studied by performing three dimensional numerical simulation and experimental investigations. The loss mechanisms in these stages and the effects of Mach number on stage performance are analysed using the numerical simulation results. The results show that the blockage effect plays a boundary layer key role in the compressor stage for extremely channel width at low flow coefficients. Unlike what is generally accepted that the performance of stage decreases with increaseing Mach number, the centrifugal stage at low Mach number, shows a higher performance for increasing Mach number. Only after reaching a certain Mach number, the performance of stage decreases with increasing Mach number. The performance of vaneless diffuser and return channel of the stage at low coefficient is almost independent of the Mach number, and the performance of these stationary components is governed by the inlet flow angle and their relative width.
出处
《风机技术》
2015年第5期11-16,30,共7页
Chinese Journal of Turbomachinery
基金
国家科技支撑计划项目(2013BAF01B03)
关键词
离心压缩机
小流量系数
马赫数
数值模拟
centrifugal compressor
lowflow coefficients
Mach number
numericalsimulation
