Scramjet engine


    In News

    Scramjet engine’s hot test was conducted successfully at ISRO’s Propulsion Research Complex in Tamil Nadu

    About scramjet

    • A scramjet engine is an improvement over the ramjet engine as it efficiently operates at hypersonic speeds and allows supersonic combustion. 
      • Thus it is known as Supersonic Combustion Ramjet, or Scramjet.
    • It allows supersonic combustion by breathing oxygen from the at hen allows the oxygen to mix with hydrogen already stored in the vehicle to trigger combustion, and produce the desired thrust to lift the satellite to its designated orbit. 


    • A ramjet is a form of air-breathing jet engine that uses the vehicle’s forward motion to compress incoming air for combustion without a rotating compressor. 
    • Fuel is injected in the combustion chamber where it mixes with the hot compressed air and ignites. 
    • A ramjet-powered vehicle requires an assisted take-off like a rocket assist to accelerate it to a speed where it begins to produce thrust.
    • Ramjets work most efficiently at supersonic speeds around Mach 3 (three times the speed of sound) and can operate up to speeds of Mach 6. However, the ramjet efficiency starts to drop when the vehicle reaches hypersonic speeds.