叶片厚度对混流式核主泵叶轮能量性能影响研究

基于三维不可压缩流体N-S方程和RNGκ-ε湍流模型,对混流式核主泵叶轮水力模型的能量性能进行了数值预测,研究了不同叶片厚度及其分布规律对混流叶轮模型水力性能的影响。通过分析叶轮叶片压力面、吸力面的静压分布,获得叶片表面的载荷分布及其变化规律。结果表明:随着叶轮叶片厚度减薄,最高效率值有所增大且高效点向大流量工况偏移;当叶片最厚处位置在靠近进口边约1/3处时,叶轮水力效率值最大;随着叶片最厚位置由进口向出口移动时,最高效率点向大流量工况偏移。

Influence of Blade Thickness on Energy Performance of Mixed Flow Nuclear Main Pump

Based on the three dimensional incompressible Navier-Stokes equation and RNG κ- ε turbulent model,energy performance of mixed-flow nuclear main pump impeller hydraulic model was numerically predicted and the influence of the blade thickness and distribution of mixed-flow nuclear main pump impeller model on hydraulic performance was studied. Through analyzing the static pressure on impeller blade pressure surface and the suction side and the load distribution of mixed-flow pump impeller blade,the study revealed the main variation characteristics of the load on blade surface. The results show: with the impeller blade thickness being thin,the highest efficiency value gets increased and efficient points to offset heavy traffic conditions; When the thickest blade position locates at about 1 /3 part of imports edge,the values of impeller hydraulic efficiency is the highest; As the thickest blade's location moving from enter port to exit,the highest efficiency point offset to the heavy traffic conditions.