悬臂静子叶栅与高速运动轮毂间隙流研究

Research of Hub Leakage Flow Between Cantilevered Cascade and High-speed Moving Hub

悬臂静叶结构可以减轻压气机的重量并降低轴向长度,但在高速运动轮毂作用下其叶根泄漏流细节尚不明确。本文采用经过实验数据校准的数值模拟方法探究了高速运动轮毂情况下不同间隙对于悬臂静叶性能和泄漏流场细节的影响。结果表明,当间隙增大时,悬臂静叶总压损失呈非线性增大,近轮毂处叶片载荷峰值先增大后减小且其位置向尾缘方向移动。泄漏流轨迹呈现三区分布,间隙增大使得通道70%轴向弦长后的高湍动能区在周向和径向范围更大。

The cantilevered stator has the advantages of reducing weight and reducing axial length of highly loaded compressor.But the details of the hub leakage flow resulting from the clearance between the high-speed moving hub and the cantilevered stator hub are unclear.In this paper,the effect of different hub clearances on the performance and the leakage flow was analyzed through the numerical simulation.The numerical method was calibrated by the experiment.The results indicate that as the clearance increases,the total pressure loss increases nonlinearly.The peak blade loading near the hub increases first and then decreases.The location of it moves backwards.The leakage fow can be divided into three parts.The increasing clearance enlarges the circumferential and radial range of high turbulence kinetic energy area after 70%chord length.