Turbo Engine

When we think about super cars and supersonic aircrafts, a question always comes in mind that how could these cars attains such a high speed, and the answer is just by using a turbo charged engine.

A turbo-compound engine is a reciprocating engine that employs a blowdown turbine to recover energy from the exhaust gases. The turbine is usually mechanically connected to the crankshaft, as on the DC-7B and the Super Constellation, but electric and hydraulic systems have been investigated as well. The turbine increases the output of the engine without increasing its fuel consumption, thus reducing the specific fuel consumption. The turbine is referred to as a "blowdown turbine" , as it recovers the energy developed in the exhaust manifold during blowdown, that is the first period of the exhaust process when the piston still is on its expansion stroke, this is possible since the exhaust valves open before bottom dead center.

Turbo-compounding was used on on several airplane engines after World War II, including the Napier Nomad and the Wright R-3350. The first aircraft engine to be tested with a power-recovery turbine was the Rolls-Royce Crecy, during WWII.