BYPASS RATE IMPACT ON TURBOFAN PARAMETERS USING ENERGY AND EXERGY ANALYSIS

One of the important parameters in turbofans is the bypass rates. In this paper, the rate of bypass in turbofans and also the accurate modeling of turbofans according to energy and exergy analysis is studied. Also physical and chemical exergy in cycle according to the changes in the outlet temperature of the combustion chambers and inlet Mach number is considered in modeling procedure. The results show that the high-pressure compressor has a high recovery rate. Also the combustion chamber has the highest rate of exergy loss which is 29% of the total cycle exergy loss. The second law efficiency of the turbofan was calculated to be 44%. The results also showed that with increasing Mach number at inlet, exergy efficiency almost remains constant and overall efficiency of the cycle depends on bypass rate ratio but generally shows a relative decrease.