Optimum design of the inlet port profile of a ramjet extended range projectile

Abstract

The air-inlet is one of the important components of the stamped extended range engine. Its performance directly affects the thrust of the ramjet engine, which in turn affects the range of the projectile. Because the stamped extended range projectile has the characteristics of simple structure, light weight and small volume, the inlet profile of the stamped extended range projectile is generally unadjustable, and the air-inlet surface quality directly determines the performance of the air-inlet. And the resistance characteristics of the shells. Since the air-inlet is associated with the curved portion of the projectile, the curved portion is one of the main sources of resistance to the projectile, so it is necessary to optimize the design of the air-inlet profile. Firstly, based on the CFD flow field simulation, the optimal design method of the air-inlet profile is studied. The parametric modeling, flow field simulation and optimization strategy of the air-inlet are integrated on the platform to realize automatic optimization. The optimization of the nozzle is optimized by this optimized design method, which proves its feasibility. Then, the single-objective optimization and multi-objective optimization of the air-inlet profile are carried out, and the geometric model is established to more accurately describe the flow field characteristics and obtain a more accurate air-inlet profile. Finally, a supersonic wind tunnel test was carried out on the optimized air-inlet, and the wall static pressure and the total outlet pressure of the windward side and the leeward side were measured and compared with the simulated Mach number of 2.5 and 2.0. Comparative Results. The two are basically the same, indicating that the numerical simulation results can basically reflect the pressure change and the change of the total pressure in the air-inlet. Therefore, the reliability of simulation-based optimization results is high.