蜗壳断面形状对大型双吸泵性能影响的数值模拟

Numerical Simulation of the Influence of Volute Section Shapeon the Radial Force of Large Double Suction Pump

为研究蜗壳不同断面形状对大型双吸离心泵性能的影响,在确保其他因素不变的条件下,设计3种不同的蜗壳方案进行瞬态数值模拟。结果表明:3种蜗壳断面方案在设计工况下,圆形蜗壳的效率最高为90.7%,其次是梨形蜗壳,效率为90.2%,矩形蜗壳的效率最低为88.9%,且圆形蜗壳的高效区有所扩大;在各流量工况下圆形蜗壳能量损失率均为最少,在设计工况时圆形蜗壳的能量损失率为0.3%,矩形蜗壳的能力损失率为1.1%;在大流量和设计流量下,圆形蜗壳的叶轮所受径向力均最小,梨形蜗壳次之,矩形蜗壳最大;在设计工况下,3种蜗壳方案对蜗壳上的压力脉动均呈现周期性变化,圆形蜗壳在各检测点处压力脉动的振幅幅度均为最小。

In order to study the influence of different cross-section shapes of volute on the performance of large double-suction centrifugal pump,in this paper,three different volute schemes are designed for transient numerical simulation,keeping other factors remain un⁃changed.The results show that under the design working conditions,the efficiency of the circular volute is the highest,which is 90.7%,fol⁃lowed by the pear-shaped volute,which is 90.2%,and the efficiency of the rectangular volute is the lowest,which is 88.9%.And the highefficiency area of the circular volute has been expanded.The energy loss rate of the circular volute is the least under each flow condition.The energy loss rate of the circular volute is 0.3%and the energy loss rate of the rectangular volute is 1.1%under the design condition.Under large flow and design flow,the radial force of the impeller with circular volute is the smallest,followed by the pear-shaped volute,and the rectangular volute is the largest.Under the design conditions,the three volute schemes show periodic changes in the pressure pulsation on the volute,and the amplitude of the pressure pulsation at each detection point of the circular volute is the smallest.