OPTIMIZATION OF COWL AND RAMP ANGLES OF SUPERSONIC INTAKE OF RAMJET ENGINE

Supersonic inlet diffusers plays an important role in the performance of air-breathing engines, particularly in the context of ramjet engines.Ramjet engines are known for their simplicity and high speed capabilities , making them valuable in aircraft and missile propulsions. The efficiency of a ramjet engine was highly dependent on the performance of supersonic inlet diffuser.The diffuser was responsible for slowing down and compressing the the incoming supersonic air( mach number 3 to 5) into subsonic air( mach number 0.3 to 0.4) for combustion in the engine. So, the performance of the ramjet engine was affected by supersonic inlet diffuser. Supersonic inlet diffuser performance improved by suitable cowl and ramp geometry design. Present study focuses on finding optimal cowl and ramp angles of supersonic inlet diffuser. Pressure recovery and outlet mach number were numerically obtained at cowl angle(110, 120, 130, and 140), first ramp angles(30,40, and 50) and second ramp angles(210, 220, and 230 ).