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Fwd: Link /Prandtl-Glauert singularity

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  • MGC
    ... What Supersonic Looks Like. http://news.yahoo.com/s/livescience/20090630/sc_livescience/whatsuperson iclookslike
    Message 1 of 1 , Jul 1, 2009
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      --- In LWJF@yahoogroups.com, "MGC" <max_g_cunningham@...> wrote:


      What Supersonic Looks Like.



      http://news.yahoo.com/s/livescience/20090630/sc_livescience/whatsuperson\
      \
      iclookslike
      <http://news.yahoo.com/s/livescience/20090630/sc_livescience/whatsuperso\
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      niclookslike>


      Robert Roy Britt
      <http://us.rd.yahoo.com/dailynews/livescience/sc_livescience/byline/what\
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      supersoniclookslike/32545689/SIG=11qqe5uu2/*http://www.livescience.com/p\
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      hp/contactus/author.php?r=rb>
      Editorial Director
      LiveScience.com
      <http://us.rd.yahoo.com/dailynews/livescience/sc_livescience/byline/what\
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      supersoniclookslike/32545689/SIG=10sog4vj6/*http://www.livescience.com>
      robert Roy Britt
      <http://us.rd.yahoo.com/dailynews/livescience/sc_livescience/byline/what\
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      supersoniclookslike/32545689/sig=11qqe5uu2/*http://www.livescience.com/p\
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      hp/contactus/author.php?r=rb>
      editorial Director
      livescience.com
      <http://us.rd.yahoo.com/dailynews/livescience/sc_livescience/byline/what\
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      supersoniclookslike/32545689/sig=10sog4vj6/*http://www.livescience.com>
      – Tue Jun 30, 9:35 am ET
      The breaking of the sound barrier is not just an audible phenomenon. As
      a new picture from the U.S. military shows, Mach 1 can be quite visual.



      This widely circulated new photo
      <http://us.rd.yahoo.com/dailynews/livescience/sc_livescience/storytext/w\
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      hatsupersoniclookslike/32545689/SIG=12ip326rt/*http://www.livescience.co\
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      m/strangenews/090630-sound-barrier-prandtl-glauert.html> shows a Air
      Force F-22 Raptor aircraft participating in an exercise in the Gulf of
      Alaska June 22, 2009 as it executes a supersonic flyby over the flight
      deck of the aircraft carrier USS John C. Stennis.



      The visual phenomenon, which sometimes but not always accompanies the
      breaking of the sound barrier
      <http://us.rd.yahoo.com/dailynews/livescience/sc_livescience/storytext/w\
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      hatsupersoniclookslike/32545689/SIG=11tc9jgoe/*http://www.livescience.co\
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      m/mysteries/070323_mach_speed.html> , has also been seen with nuclear
      blasts
      <http://us.rd.yahoo.com/dailynews/livescience/sc_livescience/storytext/w\
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      hatsupersoniclookslike/32545689/SIG=1ftde7a7g/*http://www.livescience.co\
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      m/php/multimedia/imagedisplay/img_display.php?s=strangenews&c=rbritt-col\
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      umnist-153x65&l=&pic=090517-nuclear-bomb-trinity-02.jpg&cap=The+first+nu\
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      clear+bomb+explosion+at+the+Trinity+Test+Site+New+Mexico%2C+July+16%2C+1\
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      945%2C+taken+from+6+miles+away.+As+Los+Alamos+director+J.+Robert+Oppenhe\
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      imer+watched+the+demonstration%2C+he+recalled+a+line+from+the+Hindu+scri\
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      pture%2C+the+Bhagavad+Gita%2C+%22Now+I+am+become+Death%2C+the+Destroyer+\
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      of+worlds.%22+Credit%3A+Library+of+Congress&title=> and just after
      space shuttles launches, too. A vapor cone was photographed as the
      Apollo 11 moon-landing mission rocketed skyward
      <http://us.rd.yahoo.com/dailynews/livescience/sc_livescience/storytext/w\
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      hatsupersoniclookslike/32545689/SIG=1g8t1vsu8/*http://www.livescience.co\
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      m/php/multimedia/imagedisplay/img_display.php?s=strangenews&c=rbritt-col\
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      umnist-153x65&l=&pic=090630-apollo-11-sound-02.jpg&cap=The+Apollo+11+Sat\
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      urn+V+lifted+off+with+astronauts+Neil+A.+Armstrong,+Michael+Collins+and+\
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      Edwin+E.+Aldrin,+Jr.,+on+July+16,+1969,+from+Kennedy+Space+Center,+en+ro\
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      ute+to+the+first+moon+landing.+A+vapor+cone+seen+in+the+image+is+thought\
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      +to+be+related+to+the+breaking+of+the+sound+barrier,+in+a+phenomenon+cal\
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      led+a+Prandtl%C3%B1Glauert+singularity.+Credit%3A+NASA&title=> in 1969.



      The phenomenon is not well studied. Scientists refer to it as a vapor
      cone, shock collar, or shock egg, and it's thought to be created by
      what's called a Prandtl-Glauert singularity.



      Here's what scientists think happens:



      A layer of water droplets gets trapped between two high-pressure
      surfaces of air. In humid conditions, condensation can gather in the
      trough between two crests of the sound waves produced by the jet. This
      effect does not necessarily coincide with the breaking of the sound
      barrier, although it can. To learn more, click here
      <http://us.rd.yahoo.com/dailynews/livescience/sc_livescience/storytext/w\
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      hatsupersoniclookslike/32545689/SIG=11tc9jgoe/*http://www.livescience.co\
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      m/mysteries/070323_mach_speed.html> .

      --- End forwarded message ---
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