Mostafa Mahmoodi - Malek Ashtar University of Technology, Aerospace University Complex, Tehran, Iran
Kiumars Khani Aminjan - Young Researchers and Elite Club, Islamic Azad University, Astara Branch, Astara, Iran

All motors in jets have an inlet part for bringing free air into motor which we call it inlet duct. Inlet duct is placed before compressor and has considerable impact on trust amount. It is in various shapes and sizes which each one has specific characteristics with respect to motor and airplane speed. But, their common characteristics include having the lowest pressure reduction and the lowest distortion. In this paper, the air inlet of a fourth generation warplane (Sukhoi 24) is considered fo the numerical simulation. Then, with regard to its motor characteristics according to Jane’s aero-engines and with respect to experimental relations and existed plans, its air inlet is modeled and numerically analyzed by FLUENT software. With regard to the conducted analysis for H=0 and obtaining 1.07 for Mach number, air inlet will be analyzed in two conditions: subsonic and supersonic. more pressure reduction and more distortion have been observed in the subsonic condition. Of course, with respect to the nature of Sukhoi 24 which is a raptor warplane, it is expected that desirable results can be obtained for supersonic condition (The efficiency was 98.64% and distortion was about 0.32).

Sukhoi 24,Air inlet,Pressure reduction,Pressure efficiency,Distortion