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Internal-combustion engines are the most broadly applied and widely used power-generating devices currently in existence.

Examples include gasoline engines, diesel engines, gas-turbine engines, and rocket-propulsion systems.

Internal-combustion engines are divided into two groups: continuous-combustion engines and intermittent-combustion engines.

The continuous-combustion engine is characterized by a steady flow of fuel and oxidizer into the engine. A stable flame is maintained within the engine (e.g., jet engine). The intermittent-combustion engine is characterized by periodic ignition of air and fuel and is commonly referred to as a reciprocating engine. Discrete volumes of air and fuel are processed in a cyclic manner. Gasoline piston engines and diesel engines are examples of this second group.

Internal-combustion engines can be delineated in terms of a series of thermodynamic events. In the continuous-combustion engine, the thermodynamic events occur simultaneously as the oxidizer and fuel and the products of combustion flow steadily through the engine. In the intermittent-combustion engine, by contrast, the events occur in succession and are repeated for each full cycle.

With the exception of rockets (both solid rocket motors and liquid-propellant rocket engines), internal-combustion engines ingest air, then either compress the air and introduce fuel into the air or introduce fuel and compress the air-fuel mixture.

Then, common to all internal-combustion engines, the air-fuel mixture is burned, work is extracted from the expansion of the hot gaseous products of combustion, and ultimately the products of combustion are released through the exhaust system. Their operation can be contrasted with that of external-combustion engines (e.g., steam engines), in which the working fluid does not chemically react and energy gain is achieved solely through heat transfer to the working fluid by way of a heat exchanger.

The most common internal-combustion engine is the four-stroke, gasoline-powered, homogeneous-charge, spark-ignition engine.

in this application explained about the component parts, types and mechanism of Internal-combustion engine clearly and easily.

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