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help for runner efficiency and working head

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Old   November 15, 2008, 11:22
Default help for runner efficiency and working head
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hi,all i am working on the efficiency of the runner, but when i calculated the head from the pressure of the inner and outer, why it is lower than the actrual head? the formula is H="p/gρ,and "p=Pin-Pout , how can i calculate the loss head? by the way, i doubt my boundary condition is wrong .according to the N11-Q11 curve , i made the model by the appropriate opening of blade and vane, than i set the massflow of inner ,and outflow of the outer. but i can not sure the base of the atmosphere. does anyone can show me the proper method? my leader will quit me if i can not deal ! thank a lot!!!!
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