混流式核主泵叶轮叶片厚度分布规律对能量性能的影响

采用数值计算方法,开展混流式核主泵叶轮叶片自前盖板至后盖板方向厚度分布规律对能量性能影响的研究。通过对5种具有不同厚度分布规律叶片的叶轮进行比较分析,探索最佳叶片厚度比值和其对叶片表面静压力分布规律的影响。结果表明:当叶片后盖板处厚度与前盖板处厚度比值L=1.5时,叶轮的水力效率达到最高,当L=1.25时叶片做功能力低,叶轮内能量损失大,水力效率较低;在小流量工况下,随着比值L的增加,相同流量下扬程和水力效率都随之升高;在大流量工况下,扬程和水力效率都随着L的增大而降低;叶轮流道内压能沿着前盖板至后盖板方向增大并且最大压能位置向中间移动。

Influence of Blade Thickness Distrbution on Energy Performance of Mixed-flow Reactor Coolant Pump

Taking the method of numerical calculation to carry out the study about the influence between energy performance and blade thickness distribution of reactor coolant pump impeller in the direction from shroud to hub. By comparing and analyzing5 impellers with blades which have different thickness distribution to explore the best blade thickness ratio and its effect on the distributions of static pressure of blades. The results show: when the blade thickness ratio in hub and shroud L = 1. 5,the hydraulic efficiency of impeller can be highest. However,when L = 1. 25,the work capacity of blades gets low. It means that there is much loss of energy in impeller and the hydraulic efficiency is lower. In light flow rate conditions,the head and hydraulic efficiency in the same flow rate condition are increasing with L increasing. In heavy flow rate conditions,head and hydraulic efficiency are increasing with L reducing. The pressure in impeller flow channel along shroud to hub increasing and maximum pressure can move toward the middle place.