Jmdonev: 1 revision imported

2018-09-03T22:23:41Z

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energy>Jmdonev at 21:34, 21 August 2018

2018-08-21T21:34:38Z

← Older revision		Revision as of 21:34, 21 August 2018
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	[[Category:Done ~~2015~~-07-24]]		[[Category:Done 2018-08-03]]
	<onlyinclude>'''Specific power''' or '''power-to-weight ratio''' is a measure of performance for an [[engine]] in a vehicle or in a power plant. It is defined as the [[power]] output by it divided by its [[mass]],<ref>OED in entry on specific (July 8, 2015) it says (in definition d): d. Physics. Of or designating a dimensionless number equal to the ratio of the value of a property of a given substance to the value of the same property of some reference substance (as water) or of vacuum under the same conditions, so providing a relative value for comparison with different substances, as specific gravity (see gravity n. 4c); specific heat (see heat n. 2d); specific inductive capacity = dielectric constant n. at dielectric adj. 2b; specific viscosity, the difference between the viscosity of a solution of a given concentration and that of the pure solvent, divided by the viscosity of the pure solvent. The energy education team has interpreted this to include specific power. This term has been used in places online.</ref> typically in units of [[watt\|W]]/[[kilogram\|kg]] or [[horsepower\|hp]]/lb.</onlyinclude> This value allows for a clear metric of the power that is independent of the vehicle or [[power plant]]'s size.		<onlyinclude>'''Specific power''' or '''power-to-weight ratio''' is a measure of performance for an [[engine]] in a vehicle or in a power plant. It is defined as the [[power]] output by it divided by its [[mass]],<ref>OED in entry on specific (July 8, 2015) it says (in definition d): d. Physics. Of or designating a dimensionless number equal to the ratio of the value of a property of a given substance to the value of the same property of some reference substance (as water) or of vacuum under the same conditions, so providing a relative value for comparison with different substances, as specific gravity (see gravity n. 4c); specific heat (see heat n. 2d); specific inductive capacity = dielectric constant n. at dielectric adj. 2b; specific viscosity, the difference between the viscosity of a solution of a given concentration and that of the pure solvent, divided by the viscosity of the pure solvent. The energy education team has interpreted this to include specific power. This term has been used in places online.</ref> typically in units of [[watt\|W]]/[[kilogram\|kg]] or [[horsepower\|hp]]/lb.</onlyinclude> This value allows for a clear metric of the power that is independent of the vehicle or [[power plant]]'s size:

	[[Turbine]]s typically have the largest specific power for an engine~~, which~~ makes them useful for airplanes in order to achieve sufficient [[lift]]. Sports car engines will also typically have a fairly high specific power, allowing them to have increased [[acceleration]] and handling.		<center><math>\textrm{Specific power} = \frac{\textrm{Power}}{\textrm{mass}}</math></center>

			[[Turbine]]s, like a gas turbine in a plane, typically have the largest specific power for an engine. This makes them useful for airplanes in order to achieve sufficient [[lift]], like in Figure 1. Sports car engines will also typically have a fairly high specific power, allowing them to have increased [[acceleration]] and handling.

	Some examples:<ref>R. Ryan, NASA. (July 8, 2015). ''Lessons in Systems Engineering - The SSME Weight Growth History'' [Online], Available: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20090004620.pdf</ref>		Some examples:<ref>R. Ryan, NASA. (July 8, 2015). ''Lessons in Systems Engineering - The SSME Weight Growth History'' [Online], Available: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20090004620.pdf</ref>


	{\| class="wikitable"		{\| class="wikitable"
	\|-		\|-
	! Engine Type !! Power / Mass !! Specific Power		! Engine Type !! Power (W) / Mass (kg) !! Specific Power (W/kg)
	\|-		\|-
	\| Automobile engine \|\| ~~200 hp~~ / ~~370 lb~~ \|\| ~~0.54 hp/lb~~		\| Automobile engine \|\| 149140 / 168 \|\| 888
	\|-		\|-
	\| Indycar Engine \|\| ~~800 hp~~ / ~~275 lb~~ \|\| ~~2.91 hp/lb~~		\| Indycar Engine \|\| 596560 / 125 \|\| 4772
	\|-		\|-
	\| Jet Engine \|\| ~~52900 hp~~ / ~~2800 lb~~ \|\| ~~18.9 hp/lb~~		\| Jet Engine \|\| 39447523 / 1270.059 \|\| 31061
	\|-		\|-
	\| Space Shuttle Main Engine <br/> Fuel Turbopump \|\| ~~72000 hp~~ / ~~775 lb~~ \|\| ~~93 hp/lb~~		\| Space Shuttle Main Engine <br/> Fuel Turbopump \|\| 53690391 / 352 \|\| 152530
	\|}		\|}

			[[File:natgasturb.png\|thumb\|center\|800px\|Figure 1. A diagram of a gas turbine engine. Aircraft gas turbines have the very large specific powers because they're designed to be light for their given power.<ref>Wikimedia Commons [Online], Available: https://upload.wikimedia.org/wikipedia/commons/4/4c/Jet_engine.svg</ref>]]
			==For Further Reading==
			*[[Engine]]
			*[[Power]]
			*[[Turbine]]
			*[[Acceleration]]
			*[[Horsepower]]
			*Or explore a [[Special:Random\|random page]]

	==References==		==References==
	{{reflist}}		{{reflist}}
	[[Category:Uploaded]]		[[Category:Uploaded]]

J.williams: 1 revision imported

2015-08-26T21:31:40Z

1 revision imported

← Older revision	Revision as of 21:31, 26 August 2015
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J.williams at 16:59, 12 August 2015

2015-08-12T16:59:04Z

New page

[[Category:Done 2015-07-24]]
<onlyinclude>'''Specific power''' or '''power-to-weight ratio''' is a measure of performance for an [[engine]] in a vehicle or in a power plant. It is defined as the [[power]] output by it divided by its [[mass]],<ref>OED in entry on specific (July 8, 2015) it says (in definition d): d. Physics. Of or designating a dimensionless number equal to the ratio of the value of a property of a given substance to the value of the same property of some reference substance (as water) or of vacuum under the same conditions, so providing a relative value for comparison with different substances, as specific gravity (see gravity n. 4c); specific heat (see heat n. 2d); specific inductive capacity = dielectric constant n. at dielectric adj. 2b; specific viscosity, the difference between the viscosity of a solution of a given concentration and that of the pure solvent, divided by the viscosity of the pure solvent. The energy education team has interpreted this to include specific power. This term has been used in places online.</ref> typically in units of [[watt|W]]/[[kilogram|kg]] or [[horsepower|hp]]/lb.</onlyinclude> This value allows for a clear metric of the power that is independent of the vehicle or [[power plant]]'s size.

[[Turbine]]s typically have the largest specific power for an engine, which makes them useful for airplanes in order to achieve sufficient [[lift]]. Sports car engines will also typically have a fairly high specific power, allowing them to have increased [[acceleration]] and handling.

Some examples:<ref>R. Ryan, NASA. (July 8, 2015). ''Lessons in Systems Engineering - The SSME Weight Growth History'' [Online], Available: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20090004620.pdf</ref>

{| class="wikitable"
|-
! Engine Type !! Power / Mass !! Specific Power
|-
| Automobile engine || 200 hp / 370 lb || 0.54 hp/lb
|-
| Indycar Engine || 800 hp / 275 lb || 2.91 hp/lb
|-
| Jet Engine || 52900 hp / 2800 lb || 18.9 hp/lb
|-
| Space Shuttle Main Engine <br/> Fuel Turbopump || 72000 hp / 775 lb || 93 hp/lb
|}

==References==
{{reflist}}
[[Category:Uploaded]]

Specific power - Revision history

Jmdonev: 1 revision imported

energy>Jmdonev at 21:34, 21 August 2018

J.williams: 1 revision imported

J.williams at 16:59, 12 August 2015