对旋叶轮机
counter-rotating turbo machinery
对旋轴流叶轮
Contra-rotating Axial Flow Impellers
相对叶轮泵-背靠背叶轮泵
pump with opposed impellers
变矩器叶轮轮毂
converter impeller hub
torque converter impeller hub
三叶叶轮
Triplicate blade impeller
双流道叶轮叶片绘型
The Drawing of Vane of Double Channel Impeller
叶轮轮毂端直径
impeller hub end diameter