关键词: 运输机；数值计算；附加前体力；短舱前罩力；升阻极曲线

Abstract: Three-dimesional model has been carried out based on a typical transport airplane for the pur.pose of exploring intake drag determination method in integrated design of airplane and aeroengine. Numericalcalculations were conducted for different flight altitudes，Mach numbers and engine conditions based on the flight test data. According to the numerical results，determination method of intake drag increment was put forward andvariation of addtional front force and nacelle front force with capture area ratio，flight altitude and Mach numberwas summarized. Simulation results show that the change of engine power condition and capature area ratio leadsto the variation of intake drag. However，flight altitude has no effects on nacelle front force coefficients and addi.tional front force coefficients according to the thrust/drag division method in AGARD-CP-150.

Key words: Transport airplane；Numerical calculation；Additional front force；Nacelle front force；Air. plane lift resistance pole curve