11.5 a Suppose that a compressor has ten stages each with a pressure ratio of 1.3. Find the overall pressure ratio. If t

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11 5 A Suppose That A Compressor Has Ten Stages Each With A Pressure Ratio Of 1 3 Find The Overall Pressure Ratio If T 1 (86.47 KiB) Viewed 41 times

11.5 a Suppose that a compressor has ten stages each with a pressure ratio of 1.3. Find the overall pressure ratio. If the polytropic efficiency of each stage is 90%, find the overall temperature ratio across the whole machine. Confirm that the polytropic efficiency across the whole machine is 90% and find the isen- tropic efficiency across a stage, Nisen,st, and across the ) whole machine, Nisen,ovº (Ans: (a) 13.78, 2.300, Np,ov = 0.90, Nisen,ov 0.90, Nisen,ov = 0.858, Misen,st = 0.896) b Suppose that the stage pressure ratios remain 1.3, but that for the first five stages the efficiency is 90% and for the last five stages it is 80%. Find the overall temperature ratio and thence the polytropic and isentropic efficiencies for the whole machine. (Ans: (b) 13.78, 2.423, np,ov = 0.846, Nisen,ov 0.784)