论文部分内容阅读
为了研究诱导轮的几何形状以及诱导轮与叶轮之间的相互配合对于高速离心泵的空化性能的影响,基于RNG k-ε模型和Schnerr-Sauer空化模型,对于高速离心泵在前置不同几何结构的变螺距诱导轮和多种诱导轮与叶轮的配合条件下进行了数值模拟.结果表明,与叶片直径线性变化的变螺距诱导轮相比,叶片直径为常数的变螺距诱导轮可以更好地改善高速离心泵的空化性能;诱导轮与叶轮直径轴向距离太小或者过大,将导致叶轮的压力系数与空化数减小,叶轮流道气相体积占比增加,高速离心泵的效率及扬程下降;另外,高速离心泵的空化性能随周向夹角改变而产生很大波动,但是变化规律不明显.
In order to study the influence of induction wheel geometry and the interaction between induction wheel and impeller on cavitation performance of high-speed centrifugal pump, based on RNG k-ε model and Schnerr-Sauer cavitation model, The results show that the variable pitch induction wheel with constant blade diameter can be more effective than the variable pitch induction wheel with linear blade diameter change Good to improve the high-speed centrifugal pump cavitation performance; induction wheel and impeller diameter axial distance is too small or too large, will lead to the impeller pressure coefficient and the number of cavitation decreases, the impeller flow channel gas volume proportion increases, high-speed centrifugal pump The efficiency and lift drop; In addition, the high-speed centrifugal pump cavitation performance with the circumferential angle changes have great fluctuations, but the change is not obvious.