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针对半开式离心叶轮的间隙泄漏和间隙气流对气动性能的影响,采用数值方法分析了3种叶顶间隙值下叶轮的气动性能、设计工况下的叶片载荷分布、间隙流动气流角以及泄漏涡的分布特征.结果表明:叶轮叶片表面的压力分布规律不受叶顶间隙的影响,但叶片载荷在叶片的中后部有不同程度的减小;间隙处的内泄漏流动本身引起的流动损失较小;与零间隙相比,间隙处的内泄漏气流对流道前半段主流的影响甚微,但在流道中部以后,间隙流扰乱了主气流方向,并在叶顶吸力面附近形成涡流聚集区,造成明显的熵增,带来不可忽视的能量损失.希望所得结果能为建立半开式离心叶轮的间隙气动模型提供参考.
Aiming at the influence of gap leakage and air gap on aerodynamic performance of semi-open centrifugal impeller, aerodynamic performance of impeller under three kinds of tip clearances, blade load distribution under design conditions, airflow angle of clearance flow and leakage The results show that the pressure distribution on the surface of the impeller is not affected by the tip clearance but the blade load is reduced to some extent in the middle and the rear of the blade. The flow loss caused by the internal leakage flow in the clearance itself Is smaller than the zero clearance, the internal leakage air flow at the clearance has little effect on the main flow in the first half of the runner. However, after the middle part of the runner, the clearance flow disrupts the direction of the main air flow and forms a vortex gathering near the suction surface of the vane Area, resulting in a significant increase of entropy, which can not be ignored.It is hoped that the results can provide a reference for the establishment of the interspace aerodynamic model of the semi-open centrifugal impeller.