Turbo-compound engine

<p>A turbo-compound engine is a <a href="/facts/Reciprocating_engine/ItLAxmW3">reciprocating engine</a> that employs a <a href="/facts/Turbine/gqosKCkI">turbine</a> to recover energy from the exhaust gases. Instead of using that energy to drive a <a href="/facts/Turbocharger/xuabwHlB">turbocharger</a> as found in many high-power <a href="/facts/Aircraft_engine/XJo2Bd2e">aircraft engines</a>, the energy is instead sent to the output shaft to increase the total power delivered by the engine. The turbine is usually mechanically connected to the <a href="/facts/Crankshaft/oYCe9nB3">crankshaft</a>, as on the <a href="/facts/Wright_R-3350_Duplex-Cyclone/1AnowCoR">Wright R-3350 Duplex-Cyclone</a>, but electric and hydraulic power recovery systems have been investigated as well.
</p><p>As this recovery process does not increase <a href="/facts/Fuel_consumption/URhdQ7Wl">fuel consumption</a>, it has the effect of reducing the <a href="/facts/Specific_fuel_consumption_(shaft_engine)/udhf1eYn">specific fuel consumption</a>, the ratio of fuel use to power. Turbo-compounding was used for commercial airliners and similar long-range, long-endurance roles before the introduction of <a href="/facts/Turbojet/8FMD6dNg">turbojet</a> engines. Examples using the Duplex-Cyclone include the <a href="/facts/Douglas_DC-7B/4WKtLyfm">Douglas DC-7B</a> and <a href="/facts/Lockheed_L-1049_Super_Constellation/oxWrMtWp">Lockheed L-1049 Super Constellation</a>, while other designs did not see production use.
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Turbo-compound engine open-in-new

Turbo-compound engine