集流管结构对旋喷泵外特性及尾流影响

Influence of collecting pipe structure on external characteristics and wake flow of roto-jet pump

针对集流管结构严重影响旋喷泵性能这一问题,本文以专用的旋喷泵开式试验台和5种安装不同结构集流管的模型泵为研究对象,分析了集流管结构对旋喷泵内、外特性影响。数值计算为避免各向同性涡粘假设,选择雷诺应力RSM linear pressure-strain模型,将数值计算结果与试验结果对比以验证其可信度。结果表明:试验泵集流管进口直径过小或者过大都会导致旋喷泵扬程与效率的下降。集流管外形对旋喷泵的扬程、效率影响明显,翼形集流管扬程、效率较高。旋喷泵尾流区相对半径r′<0.5与r′>1.0范围内受旋壳效应影响,高速层和低速层之间动量传递剧烈,不同结构集流管在同一位置坐标雷诺应力数值差异普遍在10-4量级。研究结果可为集流管结构设计及选型提供重要基础。

The structure of the collecting pipe seriously affects performance of the roto-jet pump.Taking the open-type test bench for the roto-jet pump and five model pumps with collecting pipes of different structures as the research objects,we analyzed the influence of the collecting pipe structure on the internal and external characteristics of the roto-jet pump.In order to avoid the assumption of isotropic eddy viscosity in the numerical calculation,the Reynolds stress RSM linear pressure-strain model was selected to compare the numerical calculation results with the experimental results to verify credibility of the calculation.The results show that too small or too large an inlet diameter of the test pump collecting pipe will cause the head and efficiency of the roto-jet pump to drop.The shape of the collecting pipe has a significant impact on the head and efficiency of the roto-jet pump,and the wing-shaped collecting pipe has a higher head and efficiency.The relative radius in the range of r′<0.5 and r′>1.0 of the wake area of the roto-jet pump is affected by the rotating casing.The momentum transfer between the high-speed layer and the low-speed layer is intense,and the Reynolds stress values for the same positions of the collecting pipes of different structures are generally different on the order of 10.These results can provide an important basis for the design and selection of collecting pipe structures.