Similarity of Flow in Pump Sump

为研究水泵吸水池内流动的相似规律，特别是掺气涡和淹没涡的临界淹没深度，采用几何相似方法，建立了3个水泵吸水池模型。通过改变流量和水面高度，研究了各模型中水池涡产生的条件。在带气旋涡上，存在两条临界淹没线，一条与流量或钟形入口速度成正比，另一条与流量几乎无关。前者可能是佛汝德数的影响，后者则不清楚。在淹没涡上，最小模型的线不清晰。通过比较两条直线的系数，得到了相同流速条件下的动力学相似性，而不是弗劳德数相似性或雷诺数相似性。

To study the similarity law in the flow of pump sump, especially on the critical submergence for both air entraining vortex and submerged vortex, three model pump sumps are constructed with geometrical similarity. Changing the flow rate and water height, the condition when sump vortex occurs is studied in each model. On the air entraining vortex, there are two critical lines of submergence, one is in proportional to the flow rate or velocity at bell inlet, the other is almost independent from flow rate. The former may be the effect of Froude number, but the later is not clear. On the submerged vortex, the line is not clear in the smallest model. Comparing the coefficients of above lines, the kinetic similarity is got at the same velocity condition, not Froude number similarity or Reynolds number similarity.