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Unformatted text preview: Problem #3: Repeat problem #1, but this time using assuming the compressor and turbine have isentropic efficiency of 90%. Problem#4: Repeat problem #2 using the irreversible Brayton cycle model from problem #3. Problem #5: Beginning with the irreversible Brayton cycle model from problem #3, add a regenerative heat exchanger to heat the air at the compressor exit by using the exhaust from the turbine. Be sure to redraw the engine schematic and T-s diagram, adding new state labels as necessary. For this problem determine: a) The temperature of the turbine exhaust (F), b) the rate of specific heat input to the air (BTU/lb m ), c) the back-work ratio, d) the thermal efficiency. [Note that Q in includes ONLY to the heat added during the combustion process]. Problem #6: Repeat the calculations for problem #2 using the regenerative Brayton cycle studied in problem #5....
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- Fall '07