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Thanks, Montemayor Sorry about my insufficient information about the second paragraph. Here is the whole title of the textbook. Fluid Mechanics Thermodynamics of Turbomachinery S.L.Dixon Pergamon Press, 3rd edition 1978 On page 38, he said that "The adiabatic efficiency, although...

Thanks, milltir. Could you explain more why the positive displacement compressors prefer the adiabatic (or isentropic) efficiency, and the centrifugal and axial compressors prefer the polytropic efficiency. In a textbook by Dixon, it is said that the polytropic efficiency is useful when two...

Hi, members Polytorpic efficiency or small-stage isentropic efficiency is easily found in any textbooks of turbomachinery introduction. Its definition and difference from the adiabatic or isentorpic efficiency are well understood. But I am eager to know why the polytropic efficiency is to be...