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Ground Or Not To Ground Receiving Antenna In Storm ?
Russ wrote:
On Sun, 18 Dec 2005 12:39:09 -0800, Roy Lewallen wrote: Russ wrote: Doesn't the delta P of a fuel-air bomb travel at greater than the speed of sound? No. Roy Lewallen, W7EL The definition of dentonation includes the flame front moving at supersonic speeds. http://www.globalsecurity.org/milita...itions/fae.htm Yes, I can understand the flame front moving faster than sound, if it's not a pressure wave. I don't know the mechanism, but presume it's propagated by radiant heat. That is, a flame occurs, and its heat radiates and superheats nearby material, causing it to flame. That would be propagation by electromagnetic wave, i.e., infrared "light". The radiation would travel at the speed of light, with the apparent speed of the front being dictated by how fast the material is heated and ignited by the radiated heat. Propagation by this mechanism and at this speed would end as soon as the flame front reached the outside of the vapor cloud, beyond which the resulting pressure wave would travel at the speed of sound. I'm not an expert at this, but I'm quite sure that the only way you can get a mechanical wave to travel faster than sound is if the behavior of the air becomes nonlinear at some compression level. That could conceivably happen as a result of an explosion, but I don't think so. If anyone has any references describing such nonlinear behavior, I'd love to learn more about it. Roy Lewallen, W7EL |
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