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Thrust Augmentation

Thrust Augmentation. What is it?. A method of extracting more power from Internal Combustion Engines. Piston engines:-. Supercharging or turbo charging. Forced air aspiration. Higher Octane fuels. More power per bang. Gas turbines engines:-. Booster engines.

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Thrust Augmentation

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  1. Thrust Augmentation What is it? A method of extracting more power from Internal Combustion Engines

  2. Piston engines:- Supercharging or turbo charging Forced air aspiration Higher Octane fuels More power per bang Gas turbines engines:- Booster engines HS121 Trident and early V/STOL a/c Water injection + more fuel Methanol Water injection Afterburning Mainly military but also Concorde Other methods RATO – Rocket Assisted Take-Off Single use only Rocket boosters Thrust Augmentation

  3. Piston engines:- Supercharging or turbo charging Forced air aspiration Higher Octane fuels More power per bang Gas turbines engines:- Booster engines HS121 Trident and early V/STOL a/c Water injection + more fuel Methanol Water injection Afterburning Mainly military but also Concorde Other methods RATO – Rocket Assisted Take-Off Single use only Rocket boosters Thrust Augmentation

  4. Dart Engine Series Water Methanol Tank and Pump Torque Pressure (ENGINE POWER) Water Methanol Control Unit Torque Pressure (ENGINE POWER) Water Methanol Injection How is it injected? Water cools the turbine and increases pressure and therefore velocity = more power. Cooler turbine means more fuel (methanol) can be added = more power. In the Dart engine, more power means coarser propeller pitch = more thrust. Use limited because of combustion characteristics Thrust Augmentation

  5. Increased Primary Fuel flow Water flow Primary Fuel flow Take a closer look here Water Injection Rolls-Royce Spey Series Water cools the turbine and increases pressure and therefore velocity = more power. Cooler turbine means more fuel can be added = more power. Thrust Augmentation

  6. Typical Reheat System Rolls-Royce Phantom Spey and Jaguar Adour series Thrust Augmentation

  7. Engine Rear End Reheat System (Afterburner) Variable Nozzle Heat Shields Spray Tubes Vapour Gutters Thrust Augmentation

  8. Thrust Augmentation

  9. Variable Nozzle ‘Closed’ Engine Gas Stream without Reheat Thrust Augmentation

  10. Reheat Starts with Vapour Gutters Spraying Fuel Thrust Augmentation

  11. Then Spray Tubes add more fuel to combustion process And Variable Nozzle ‘Opens’ This is to prevent higher jet pipe pressure to ensure that reheat has no effect on jet engine Thrust Augmentation

  12. Visible ‘Shock’ waves appear in exhaust plume! FA18 Hornet on Carrier Take-off – Reheat Lit MacDonald Douglas F4 Phantom – Reheat Lit Does the Afterburner get hot? Just a little bit!! Use of the afterburner is restricted to take-off and combat only (except Concorde of course) due to the extremely high fuel consumption rate Thrust Augmentation

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