Turbo Jet Engine
Why in News?
India’s Defence Research and Development Organisation (DRDO) on July 22, 2026, has successfully developed the country's first indigenous Expendable Turbo Jet Engine in the 350-kg thrust class.
What is a Turbojet Engine?
- Definition: A gas turbine engine that generates propulsive thrust by accelerating a continuous stream of air through an exhaust nozzle.
- Working Principle: Operates on the thermodynamic Brayton cycle via four stages:
- Intake: Sucks atmospheric air into the engine.
- Compression: Raises air pressure and temperature using rotating blades.
- Combustion: Mixes fuel with pressurized air and ignites it to release massive energy.
- Exhaust: Forces hot gases through a turbine (to spin the compressor) and out the rear nozzle at extreme speeds to produce forward thrust.
- Performance: Highly efficient at high speeds and high altitudes, making it ideal for supersonic military aircraft and missile systems.
- Comparison with Turbofans: Unlike commercial turbofans which bypass air around the engine core for fuel efficiency at low speeds, a pure turbojet directs all airflow through the core, prioritizing high absolute thrust and compact size.
New Indigenous Engine
- Design and Authority: Developed entirely by DRDO-GTRE based in Bengaluru.
- Manufacturing Partner: Produced by Hyderabad-based Azad Engineering in a rapid 24-month timeline.
- Technical Architecture: Features a single-spool setup including a 4-stage axial-flow compressor, an annular combustor, a single-stage uncooled axial turbine, and a fixed exit nozzle.
- The "Expendable" Factor: Designed as a single-use engine optimized for low cost, light weight, and high reliability during one-way strategic missions.
- Primary Applications: Tailored to power long-range cruise missiles, naval anti-ship weapons, loitering munitions, and target attack drones.
- Strategic Advantage: Drastically extends weapon range and speed (up to 450 kmph) compared to traditional solid-fuelled rocket motors, allowing precision strikes without deploying manned aircraft.
