A new and effective method——power extraction method(PEM)

which is a simple

rapid and accurate tool of turbofan engine for acceleration and deceleration control law design

was proposed in this paper.Based on the steady-state performance computing model

the virtual power extractions of fan shaft and compressor shaft were introduced to make the steady-state operating points(line) move from normal operating points(line) at the constant corrected line of compressor

and the speeds of fan shaft and compressor shaft were maintained at given values.While taking into account the surge margin limit of compressor and fan

total temperature limit of turbine inlet and the flameout limit of combustor

an appropriate form was used to describe the acceleration and deceleration control law.In combination with the experiences of research and the development of turbine engines

the acceleration and deceleration control law of turbofan was designed rapidly and accurately.The computing results of the improved acceleration control law of some turbofan engine indicate that the VPEM is accurate and effective.