变工况非定常叶栅绕流数值仿真  

NUMERICAL SIMULATION FOR UNSTEADY FLOW PAST CASCADE FOR OFF-DESIGN PERFORMANCE

作　　者：吴文权[1] 韩云霞[1] 

机构地区：[1]上海理工大学动力学院,上海200093

出　　处：《工程热物理学报》2003年第1期31-34,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.59876023)

摘　　要：采用离散涡方法数值仿真了不同来流攻角下,固定与动边界叶栅绕流。在设计工况时流动接近定常流动。而变 工况时流动具有明显的非定常特征。特别是当攻角较大时,流场中存在着激烈分离,流动具有不稳定性。分离流动与旋涡 的分布息息相关。当来流角从20°到60°逐渐增大时,前驻点从背面经前缘点向腹面移动。固定叶栅与振动叶栅时的绕流 有明显的不同。振动叶栅绕流,流体决不是简单地随叶栅作同样的振动。The unsteady flow past stationary and oscillating cascade for off-design performance respectively are simulated numerically with the Discrete Vortex Method. Under the design condition, the flow is nearly steady, but for off-design performance, the flow past the cascade has inherent unsteady and/or instability characteristics, since the massive separation. The separation is related with the distribution of vortices closely. The variation of the position of leading edge stagnation point at the different incidence is shown. The flow pattern for oscillating cascade is different obviously with the stationary case, The flow past the oscillating cascade does not vary with the cascade vibration, no matter what the frequency or the phase ...

关 键 词：变工况 叶栅 仿真 叶轮机械 动边界 离散涡方法 非定常流动 

分 类 号：TH133[机械工程—机械制造及自动化]