叶片进口安放角对单叶片离心泵内流场的影响

Influence of Blade Inlet Angle on the Inner Flow Field of Single-Blade Centrifugal Pump

文章利用ANSYS Bladegen软件,设计了4种不同叶片进口安放角的叶轮。对采用不同叶轮的单叶片离心泵进行了全流场定常数值计算,并通过试验验证了所采用数值计算方法的可靠性。结果表明:额定转速下,流量越大,叶轮中间截面上压力分布越均匀,但叶轮入口处和蜗壳内的低速区范围越大,同时叶轮出口绝对速度的波动程度受叶片进口安放角的影响越小。同一工况下,适当增大叶片进口安放角可增加叶轮中间截面上高压区的范围,提高叶轮能量转换能力,但会降低叶片吸力面入口处的压力。所有流量工况下,叶片进口安放角太小或太大均不利于降低叶轮流出液流与蜗壳中液流发生碰撞产生的碰撞损失,同时不利于降低叶片所受载荷的波动程度。

In this paper,four impellers with different blade inlet angles were designed by using ANSYS Bladegen software.The steady numerical calculation of whole flow field of single-blade centrifugal pump with different impellers was carried out,and the numerical calculation scheme adopted was verified.The results show that the pressure distribution on the middle section of the impeller is more uniform,but the range of low-velocity zone at the impeller inlet and in volute is larger,and the fluctuation of absolute velocity at the impeller outlet is less affected by the blade inlet angle with the increase of flow rate at the rated rotating speed.Under the same working condition,properly increasing the blade inlet angle can increase the range of high pressure area on the middle section of the impeller and improve the energy conversion capacity of the impeller,while reducing the pressure at the inlet of the blade suction surface.Under all flow conditions,the blade inlet angle is too small or too large,which is not conducive to reducing the collision loss caused by the collision between the liquid flow from the impeller and the liquid flow in volute,reducing the fluctuation of the blade load.