蜗壳进口宽度对离心泵性能影响的分析

通过改变蜗壳的进口宽度，对蜗壳与叶轮的匹配关系进行了数值研究．在保证蜗壳断面面积不变的前提下，重新设计了两个进口宽度与原型泵互不相同的蜗壳，分别与原型泵叶轮组合作为研究所用的模型．利用FLUENT软件对离心泵内部流动进行了三维定常和非定常数值模拟．计算结果表明：泵的效率和扬程均随蜗壳进口宽度的增加而降低；随着蜗壳进口宽度的增大，蜗壳扩散段内的低速区域扩大，进口处的速度值减小；速度分布越向壁面分散，漩涡的范围越大．

Influence of Spiral Case Inlet Width on Centrifugal Pump Performance

The numerical study of the matching relation between the spiral case and the impeller was conducted by changing the spiral case inlet width. With the sectional area of the spiral case unchanged, the two spiral cases with the inlet width different from that of the prototype pump and the research model that combine with the impel- ler of the prototype pump were redesigned. With the software FLUENT, the three-dimensional steady and unsteady numerical simulation of the internal flow in the centrifugal pump was made, the calculation results show that the ef- ficiency and lift of pump decreases with the increase of the inlet width, the low speed region in the divergent section of the spiral case increases, and the inlet velocity value becomes smaller, the more divergent to the wall the velocity distribution becomes, the wider the scope of the vortex becomes.