半开式离心叶轮自循环机匣处理扩稳机理研究  

Mechanism of Stall Margin Improvement in Unshrouded Centrifugal Impeller with Self Recirculation Casing Treatment

作　　者：卜远远[1] 楚武利[1] 张皓光[1] 

机构地区：[1]西北工业大学动力与能源学院,陕西西安710072

出　　处：《计算机仿真》2012年第9期37-41,173,共6页Computer Simulation

基　　金：2010年度高等学校博士学科点(博导类)专项科研基金(20106102110023);国家自然科学基金(51006084);陕西省自然科学基金(2011JQ7018)

摘　　要：为了改善传统的机匣处理在取得扩稳效果的同时伴随着叶轮绝热效率的下降,提出了一种新式的自循环机匣处理结构,并针对LSCC离心叶轮利用数值仿真的方法研究了处理的扩稳机理。分析表明,自循环机匣处理能有效的延迟失速的发生并在近失速区域略微提高压气机的绝热效率以及总压比。通过详细的流场仿真表明,用循环形式的机匣处理结构能有效地增大进口轴向速度以及叶顶区的气流进气角度,抑制了间隙泄漏涡在叶顶通道内的发展,从而减少叶轮叶顶区域的流动损失。The conventional casing treatment can extend the steady operating range of the impeller but the efficien-cy is reduced, In order to improve this problem, a new self recirculation casing treatment was established. Numerical investigations were performed to examine the role of the self recirculation device in the enhancement of operational range of a centrifugal compressor with the LSCC centrifugal impeller by using steady 3-D calculations. The numerical results show that the self recirculation casing treatment can not only suspend the stall effectively, but also improve the adiabatic efficiency and total pressure ratio appreciably in the near of stall region. The detailed analysis of the flow field shows that the magnitudes of inlet axial velocity and flow inlet angle are increased and the development of tip leakage vortex is restrained with this casing treatment device, which can recede the loss of impeller rio area.

关 键 词：离心叶轮 数值分析 失速裕度 自循环 机匣处理 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程]