- External combustion engine
An external combustion engine (EC engine) is a
heat enginewhere an (internal) working fluidis heated by combustion of an external source, through the enginewall or a heat exchanger. The fluidthen, by expanding and acting on the mechanismof the engine produces motion and usable work. [ [http://www.merriam-webster.com/dictionary/external%20combustion external combustion - Definition from the Merriam-Webster Online Dictionary] ] The fluid is then cooled, compressed and reused (closed cycle), or (less commonly) dumped, and cool fluid pulled in (open cycle air engine).
Combustion" refers to burning fuelwith an oxidizer, to supply the heat. Engines of similar (or even identical) configuration and operation may use a supply of heat from other sources such as nuclear, solar, geothermal or exothermic reactions not involving combustion; but are not then strictly classed as external combustion engines.
The working fluid can be a
gasas in a Stirling engine, or steamas in a steam engine. The fluid can be of any composition; gasis by far the most common, although even single-phase liquidis sometimes used. In the case of the steam engine, the fluid changes phases between liquid and gas.
Internal combustion engine
Solar thermal rocket(an externally heated rocket)
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external-combustion engine — [eks tʉr′nəlkəm bus′chən, eks tʉrn′ lkəm bus′chən; ik stʉr′nəlkəm bus′chən, ik stʉrn′ lkəm bus′chən] n. an engine, as a steam engine, that obtains its power from heat produced by burning fuel outside the cylinder, turbine, etc. * * * … Universalium
external-combustion engine — [eks tʉr′nəlkəm bus′chən, eks tʉrn′ lkəm bus′chən; ik stʉr′nəlkəm bus′chən, ik stʉrn′ lkəm bus′chən] n. an engine, as a steam engine, that obtains its power from heat produced by burning fuel outside the cylinder, turbine, etc … English World dictionary
external-combustion engine — noun a heat engine in which ignition occurs outside the chamber (cylinder or turbine) in which heat is converted to mechanical energy • Hypernyms: ↑heat engine • Hyponyms: ↑steam engine * * * noun : a heat engine that derives its heat from fuel… … Useful english dictionary
external combustion engine — An engine that burns its fuel outside the engine. A steam engine is an external combustion engine … Dictionary of automotive terms
external-combustion engine — /əkˌstɜnəl kəmˈbʌstʃən ɛndʒən/ (say uhk.sternuhl kuhm buschuhn enjuhn) noun an engine in which the ignition of the fuel mixture takes place outside the engine cylinder. Compare internal combustion engine … Australian English dictionary
external combustion engine — noun Date: 1915 a heat engine (as a steam engine) that derives its heat from fuel consumed outside the cylinder … New Collegiate Dictionary
External Combustion Engine — An engine in which fuel is burned (or heat is applied) to the outside of a cylinder; a Stirling engine … Energy terms
external-combustion engine — exter′nal combus′tion en gine n. an engine, as a steam engine, in which fuel ignition takes place outside the cylinder or turbine … From formal English to slang
Combustion engine — may refer to: Internal combustion engine External combustion engine This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change … Wikipedia
combustion engine — noun : an engine that derives its motive force from the energy of combustion compare external combustion engine, internal combustion engine * * * any of various types of engines driven by energy produced by combustion … Useful english dictionary