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- Xref: sparky sci.electronics:21654 sci.energy:6470 rec.autos:30606
- Path: sparky!uunet!cs.utexas.edu!sun-barr!olivea!charnel!rat!kestrel.edu!king
- From: king@reasoning.com (Dick King)
- Newsgroups: sci.electronics,sci.energy,rec.autos
- Subject: Re: Flywheel batteries as EV power source
- Message-ID: <1992Dec28.195730.29404@kestrel.edu>
- Date: 28 Dec 92 19:57:30 GMT
- References: <1992Dec22.214616.27043@fcom.cc.utah.edu> <1992Dec25.134459.7728@ke4zv.uucp> <Bzu6DJ.I6v@ns1.nodak.edu>
- Sender: news@kestrel.edu (News)
- Organization: Reasoning Systems, Inc., Palo Alto, CA
- Lines: 28
- Nntp-Posting-Host: drums.reasoning.com
-
- In article <Bzu6DJ.I6v@ns1.nodak.edu> csmith@plains.NoDak.edu (Carl Smith) writes:
- >In article <1992Dec25.134459.7728@ke4zv.uucp> gary@ke4zv.UUCP (Gary Coffman) writes:
- >
- >>You don't understand. The gasoline *does* contain the same amount of
- >>energy as the flywheel, that's the whole point of the exercise. But
- >>liquid gasoline can't explode. Only gasoline vapor properly mixed
- >>with oxygen, 14:1 air/fuel ratio, can explode.
- >
- >Normally I wouldn't find fault with such an insignificant detail, but
- >I have seen this so many times during this tread that I thought I would
- >make a comment. 14:1 is the IDEAL mixture, but there is a rather wide
- >range over which the mixture will ignite. Eventually it will be so rich
- >that it will be hard to ignite due to "lack of oxygen," and in the other
- >direction there can be so little gas fumes that you couldn't cause an
- >explosion. You don't need perfect 14:1 to cause an explosion.
-
-
- The ambient temperature also matters.
-
- The key point is that a certain volume of the proposed explosive has to give
- off enough heat to raise a like volume to the ignition point. This is an
- easier constraint to meet for higher temperatures.
-
- The reason why Diesel engines can run unthrottled but Otto engines can't, is
- that the cylinder misture is raised above the ignition point by compression.
- Therefore, any mixture, however lean, is already explosive.
-
- -dk
-