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5-2 External Combustion Engines

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An external combustion engine is an engine where a fluid is heated by an external source.  A steam engine is an example of external combustion. The combustion (or burning) that powers the steam engine in the diagram below comes from coal or wood.  This occurs outside of the engine.

Steam is created when water is turned into a vapor or gas as it is heated by a combustion chamber.  The steam expands the volume of water by about 1600 times.  The force caused by this expansion is the source of all steam-powered engines.  Look at the steam engine below.

Locomotive

The water pressure drives a piston back and forth.  The piston is attached to the crankshaft.  The crankshaft changes the back-and-forth motion of the piston to a turning motion that drives the steam engine.

Directions: Answer the questions about steam and internal combustion engines.

1. expands the volume of water by about 1600 times.

2. The combustion (or burning) that powers a steam engine comes from or wood.

3. A is attached to a crankshaft.

4. Does the combustion that powers a steam engine occur inside or outside the engine?

5. Steam is created when water is turned into a vapor or gas as it is heated by a chamber.

 

 

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External Combustion Engine