摘要
采用非定常数值模拟的方法研究了设计工况下对转压气机内部的非定常流动机理,着重分析对转压气机内部两排转子之间动/动干涉效应对叶片非定常负荷的影响。研究表明:对转环境下,下游转子的势流干扰造成上游转子压力面的强非定常性,而在上游转子尾迹和势流干扰的影响下,下游转子叶片前缘非定常性极强,相比叶片其他区域非定常强度不是很高,并且从频谱分析的角度证实了两排转子之间的相互影响,反向旋转造成叶片表面压力脉动频率加倍;分析两排转子叶片表面的气动力可知,下游转子的势流干扰对上游转子造成的影响略微强于上游尾迹和势流对下游转子的影响,并且两排转子之间的相对位置对叶片所受非定常气动力存在一定的影响。
A time-accurate simulation is performed to investigate the unsteady flow field of two counter-rotating rotors under design conditions in the present paper with emphasis on the unsteady effect of the rotor/rotor interactions on rotor blades. The results indicate that with a counter-rotating pattern, the strong unsteadiness of the upstream rotor on its pressure surface is caused by the potential repercussion of the downstream rotor, and the upstream wakes and potential interference are the main causes for the strong unsteadiness of the downstream rotor, especially for its blade leading region. Furthermore, the interaction between the two rotors is testified by the frequency analyzing method. The counter-rotating pattern leads to the doubling of pressure fluctuation frequency on the blade surfaces. Meanwhile, by analyzing the aerodynamic force on the blade surfaces, the effect of potential repercussion on the upstream rotor is found stronger than the influence of the upstream wake and potential interference on the downstream rotor; the relative positions between the two rotors also have some influ- ence on the aerodynamic force of each rotor.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2014年第7期1874-1881,共8页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金(51076132)~~
关键词
对转压气机
动/动干涉
非定常性
数值模拟
设计工况
counter-rotating compressor
rotor/rotor interactions
unsteadiness
numerical simulation
design conditions
