In order to verify the effect of different warm up operation on aircraft engine aerodynamic stability,different warm up programs are designed.At the same time,the changing rule of engine rotor tip clearance in different programs is measured by capacitance method and the effect on engine stability margin is evaluated.The research result shows that the time of warm up increase from 1 minute to 3 minutes,engine stability margin pro-mote 3.42%;the rotating speed of warm up increase 5%,engine stability margin promote 1.68%;the time of i-dle state after warm up increase from 0 minute to 10 minutes,engine stability margin reduce 1.99%.In order to achieve the same effect of warm up,it suggests that increase the rotating speed of warm up and reduce the time of warm up.
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