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Examples
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Rapid condensation of water vapor due to a sonic shock produced at sub-sonic speed creates a vapor cone known as a Prandtl–Glauert singularity, which can be seen with the naked eye.
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Most notable is this one of the Prandtl–Glauert singularity bow shock that formed around the 327-foot-tall rocket as it went supersonic at about 39 seconds into the flight.
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The cloud effect is caused by a vapour cone also known as the ‘Prandtl-Glauert singularity’.
Amazing Photo Of Stealth Bomber Approaching Sound Barrier | Impact Lab 2009
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Here's the full shot from the lead image showing the Prandtl–Glauert singularity, and here's Wikipedia's definition: The Prandtl–Glauert singularity or P.G. singularity is sometimes referred to as a vapor cone, shock collar, or shock egg.
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There's some debate whether the aircraft themselves are breaking the sound barrier, or if the condensation effects merely reflect locally transsonic flow (we're talking about a fluid dynamics situation called a Prandtl-Glauert singularity, the clouds being low-pressure regions - thanks to Kentaro Mori for this detail).
Archive 2004-04-01 Ray Girvan 2004
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There's some debate whether the aircraft themselves are breaking the sound barrier, or if the condensation effects merely reflect locally transsonic flow (we're talking about a fluid dynamics situation called a Prandtl-Glauert singularity, the clouds being low-pressure regions - thanks to Kentaro Mori for this detail).
Shockwave condensation Ray Girvan 2004
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An unpublished Royal Aircraft Establishment report by H. Glauert dated May 1919 (which follows a briefer March 1918 report which Lindemann, Glauert, and one other contributor coauthored) includes a contemporary and authoritative account:
Getting Out of a Spin Rhodes, Richard 1988
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Compressible flow effects are considered using Prandtl-Glauert, but transonic effects are not simulated other than an empirical mach-divergent drag increase.
Softpedia - Windows - All Softpedia Mac OS 2010
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Compressible flow effects are considered using Prandtl-Glauert, but transonic effects are not simulated other than an empirical mach-divergent drag increase.
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But it was to prove a day of mixed fortunes for Gidney who was beaten 3&2 by Glauert in the afternoon singles at Costa Ballena.
Shropshire Star 2009
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