Research on analysis method of propulsive efficiency of prop-fan engine
It is of great significant for prop-fan engine under medium to high Mach number to evaluate the propul-sive efficiency of turbofan,turboprop and prop-fan engines.The mathematical model for propulsive efficiency anal-ysis is established by using energy-momentum method based on the model of separate exhaust turbofan engines,and a unified propulsive efficiency analysis method is formed for turbofan,prop-fan and propeller fan engines.Dif-ferent external fan pressure ratios,equivalent bypass ratios and different flight Mach number are selected for calcula-tion.The results show that the propulsion efficiency of turboprop engine is higher at medium to low flight Mach number,the propulsion efficiency of prop-fan engine is higher at medium to high flight Mach number,and the pro-pulsion efficiency of turbofan engine is higher at high subsonic flight Mach number.The existing flight Mach num-ber interval distribution law of the superior propulsion efficiency of turboprop,prop-fan and turbofan engines is con-formed.The study can provide a method for the research and analysis of the propulsion efficiency of turbofan,turbo-prop and prop-fan engines.
prop-fan enginebypass ratiopropulsion efficiencymathematical model
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