The effect of mass and energy storage in a volume was considered. A modeling approach for real time turbofan engine model was presented by employed inter-component volume (ICV) method. The pressure and temperature differential equations were established. The pressure and temperature were calculated through numerical integral without iterative. A turbofan engine transient model was coded by means of employing the solver equations and C++ programming language. By comparison

the calculation results have quite remarkable consistency with those results calculated by Gasturb 10 which is famous commercial software in aero-engine. The simulation results show that the maximum relative errors of high pressure compressor

turbine inlet temperature and the surge margin of compressor are within 1% and ICV method avoids iterative so the computer's running time is evidently reduced.