Shock heating - Revision history

Benstern: added links

2008-06-01T16:32:43Z

added links

← Older revision		Revision as of 11:32, 1 June 2008
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	'''Shock heating''' is a proposed explanation for supersonic velocities in certain high-performance precharged [http://www.pyramydair.com/cgi-bin/model.pl?model_id=379 air rifles], because it is impossible for ambient temperature air to accelerate a projectile to faster than the speed of sound.		'''Shock heating''' is a proposed explanation for supersonic velocities in certain high-performance precharged [http://www.pyramydair.com/cgi-bin/model.pl?model_id=379 air rifles], because it is impossible for ambient temperature air to accelerate a projectile to faster than the speed of sound.

	In shock heating, which only occurs at or slightly above the speed of sound in the gas, the flow of gas in the barrel essentially trades pressure for heat. The now heated gas has a higher speed of sound, allowing it to reach a higher velocity.		In shock heating, which only occurs at or slightly above the speed of sound in the gas, the flow of gas in the [[barrel]] essentially trades [[pressure]] for heat. The now heated gas has a higher speed of sound, allowing it to reach a higher velocity.

	Although it is suspected that this shock heating occurs in a large number of weak shocks, or even a continuous 'shock volume', in the current versions of the [[GGDT]] physics model it is modeled as a single strong shock immediately behind the projectile. This is done to keep computation time reasonable, and produces fairly accurate predictions.		Although it is suspected that this shock heating occurs in a large number of weak shocks, or even a continuous 'shock volume', in the current versions of the [[GGDT]] physics model it is modeled as a single strong shock immediately behind the projectile. This is done to keep computation time reasonable, and produces fairly accurate predictions.

Boilingleadbath: categorized

2007-04-15T12:23:04Z

categorized

← Older revision		Revision as of 07:23, 15 April 2007
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	[http://www.spudfiles.com/spudtech_archive/viewtopic.php?t=8365 Second thread on shock heating]		[http://www.spudfiles.com/spudtech_archive/viewtopic.php?t=8365 Second thread on shock heating]

			[[category:Concepts]]

Boilingleadbath: changed links

2007-04-15T10:18:32Z

changed links

← Older revision		Revision as of 05:18, 15 April 2007
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	Although it is suspected that this shock heating occurs in a large number of weak shocks, or even a continuous 'shock volume', in the current versions of the [[GGDT]] physics model it is modeled as a single strong shock immediately behind the projectile. This is done to keep computation time reasonable, and produces fairly accurate predictions.		Although it is suspected that this shock heating occurs in a large number of weak shocks, or even a continuous 'shock volume', in the current versions of the [[GGDT]] physics model it is modeled as a single strong shock immediately behind the projectile. This is done to keep computation time reasonable, and produces fairly accurate predictions.

	Although successful, it's [http://~~forums~~.~~spudtech~~.com/~~topic~~.~~asp~~?~~TOPIC_ID~~=13463 disputed] ~~(membership required)~~ if it's the correct interpretation of the phenomenon.		Although successful, it's [http://www.spudfiles.com/spudtech_archive/viewtopic.php?t=13463 disputed] if it's the correct interpretation of the phenomenon.

	== sources ==		== sources ==

	[http://~~forums~~.~~spudtech~~.com/~~topic~~.~~asp~~?~~TOPIC_ID~~=13463 New explanation]		[http://www.spudfiles.com/spudtech_archive/viewtopic.php?t=13463 New explanation]

	[http://~~forums~~.~~spudtech~~.com/~~topic~~.~~asp~~?~~ARCHIVE=true&TOPIC_ID~~=8265 Original thread on shock heating]		[http://www.spudfiles.com/spudtech_archive/viewtopic.php?t=8265 Original thread on shock heating]

	[http://~~forums~~.~~spudtech~~.com/~~topic~~.~~asp~~?~~ARCHIVE=true&TOPIC_ID~~=8365 Second thread on shock heating]		[http://www.spudfiles.com/spudtech_archive/viewtopic.php?t=8365 Second thread on shock heating]

Boilingleadbath at 04:30, 27 July 2006

2006-07-27T04:30:44Z

New page

'''Shock heating''' is a proposed explanation for supersonic velocities in certain high-performance precharged [http://www.pyramydair.com/cgi-bin/model.pl?model_id=379 air rifles], because it is impossible for ambient temperature air to accelerate a projectile to faster than the speed of sound.

In shock heating, which only occurs at or slightly above the speed of sound in the gas, the flow of gas in the barrel essentially trades pressure for heat. The now heated gas has a higher speed of sound, allowing it to reach a higher velocity.

Although it is suspected that this shock heating occurs in a large number of weak shocks, or even a continuous 'shock volume', in the current versions of the [[GGDT]] physics model it is modeled as a single strong shock immediately behind the projectile. This is done to keep computation time reasonable, and produces fairly accurate predictions.

Although successful, it's [http://forums.spudtech.com/topic.asp?TOPIC_ID=13463 disputed] (membership required) if it's the correct interpretation of the phenomenon.

== sources ==

[http://forums.spudtech.com/topic.asp?TOPIC_ID=13463 New explanation]

[http://forums.spudtech.com/topic.asp?ARCHIVE=true&TOPIC_ID=8265 Original thread on shock heating]

[http://forums.spudtech.com/topic.asp?ARCHIVE=true&TOPIC_ID=8365 Second thread on shock heating]