导叶径向位置对井用潜水泵性能的影响

为研究导叶径向位置对潜水泵性能的影响,针对250QJ125型井用潜水泵,在其他参数一定的条件下,通过改变空间导叶入口径向位置,设计了9组潜水泵导叶方案.基于雷诺时均N-S方程、RNG k-ε模型,采用SIMPLE算法,对井用潜水泵空间导叶在不同径向位置模型的内部流动进行了全流道三维数值计算.对计算结果进行分析,获得了不同导叶方案时潜水泵的性能参数,对比了不同方案导叶损失及其过水断面面积变化规律,以及导叶内部的湍动能与静压分布.结果表明:导叶径向位置对潜水泵性能影响十分显著;当径向距离增大直到导叶位于适当位置时,导叶内部损失较小,具有较强的能量转换能力,导叶内部的湍动能波动程度减弱,大大降低了流动损失,泵效率提高;但当径向距离过大时,导叶过水断面面积变化规律出现明显差异,湍动能波动程度加剧,导叶流动损失增加,泵性能下降.

Influence of diffuser radial position of guide vane on submersible well pump performance

In order to study the influence of radial position of guide vane on the performance of submersible well pump, nine configurations of guide vane were designed by changing the radial position of spatial guide vane under a certain condition of other parameters, aiming at the 250QJ125 of submersible well pump. Based on the Reynolds-averaged N-S equation, the RNG k-ε model and the SIMPLE algorithm, the three-dimensional numerical calculation of the full runner was carried out for the internal flow of the guide vane of submersible well pump in different radial positions. Through analysing the calculation results, the performance parameters of the submersible pump are obtained under different guide vane programs. At the same time, the loss of guide vane and the variation rule of cross section area as well as the turbulent kinetic energy and static pressure distribution inside the guide vane are compared. The results show that the radial position of the guide vane has a significant influence on the performance of the submersible well pump. When the radial distance of the guide vane is increased to an appropriate position, the internal loss of the guide vane is small, and the energy conversion capabi-lity is excellent. In addition, the fluctuation of the turbulent kinetic energy inside the guide vane is weakened, and the flow loss is greatly reduced, so as to improve the efficiency of pump. However, the variation rule on the cross section area of guide vanes is obviously different, and the degree of turbulent kinetic energy fluctuation aggravates when the radial distance is exaggerated. Therefore, the flow loss of guide vanes increases and the performance of pump drops.