![]() ![]() Multiple cylinders are connected to the crankshaft, oriented so that while some pistons are imparting rotation to the crankshaft during their power strokes, other pistons are being pushed back to the top of the cylinders during their exhaust strokes. As the piston is returned to the top of the cylinder during the exhaust stroke, the products of combustion (exhaust gases) are pushed out an exhaust valve. Combustion occurs intermittently – only during the power stroke – whereas in gas turbines combustion occurs continuously. Combustion of the air-fuel mixture causes an accelerated expansion of high pressure gases, which push the piston to the bottom of the cylinder during the power stroke, imparting rotation to the crankshaft. In diesel engines, the fuel is injected into the cylinder near the end of the compression stroke when the air has been compressed enough to reach the auto-ignition temperature.
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