The dynamic mathematical model and numerical simulation methods of turbofan engine were investigated.The modified engine dynamic performance numerical simulation program could simulate the engine dynamic conditions
such as changes of the inlet parameters
engine maximum rating after burning
engine acceleration and deceleration;then
dynamic performance of low-bypass turbofan engine was analyzed.The numerical simulation results show that engine thrust drops gradually within some accretion range while the inlet parameters change quickly;on the contrary
there isn't thrust surge while the inlet parameters change slowly.History of maximum specific fuel consumption is different while change speed of fuel flux accretion and diminution is unlike.Similarly
the maximum engine thrust and specific fuel consumption may vary with temperature rise.