There is great flow impact on the head of vanes at different condition, and it will affect the performance of pump system greatly, so the shape of the head of vanes should be improved.
叶片头部在不同的工况下均存在较大的水流撞击作用，适应来流不理想，这对泵的整体性能有很大影响，应予以修型。
Tom, you didn't have to undo your shirt collar where I sewed it, to pump on your head, did you? Unbutton your jacket!
汤姆，你往头上浇水的时候，不必拆掉我给你衬衫上缝的领子吧？把上衣的纽扣解开！
About the calculation on the discharge head provided to gas by pump, the paper presents three kinds of calculation methods, analyzes and compares the case calculation results.
在计算泵提供给气体的扬程时给出了三种算法，并对实例计算结果进行了分析比较。
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