Operation and Performance of Reciprocating Engine

560 WordsFeb 2, 20182 Pages
Operation and Performance of Reciprocating Engine As an accident investigator, understanding the operation and performance of the reciprocating engine is essential. Reciprocating engine can be branched into two groups, the 2-stroke and 4-stroke operating cycles. The 2-stroke reciprocating engine completes a power cycle in only one crankshaft revolution and two strokes, compression and power stroke. This is achieved when power and compression stroke happens simultaneously while the piston is near the bottom of its travel. The 4-stroke reciprocating engine operates on the 4-stroke 5-event cycle, which are the intake, compression, power, exhaust stroke and ignition event. During the intake stroke, the piston descends from top dead center (TDC) with the exhaust valve closed and the intake valve open to the bottom dead center (BDC) of the cylinder. As the piston descends, a mixture of air and fuel from the carburetor is drawn into the cylinder. After the intake valve closed, the piston moves back toward TDC of the cylinder compressing the fuel-air mixture. Just before the piston is close to TDC, ignition takes place by a spark plug in gasoline engines which produces an electric spark in the fuel-air mixture. The piston move back down toward BDC resulted by the pressure from the combustion of the compressed fuel-air mixture. This causes the crankshaft to rotate, thus turning the propeller. During the exhaust stroke, it expels the used fuel-air mixture through the exhaust valve

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