Lecture%2025_Compressible%20Flow_part1

Lecture%2025_Compressible%20Flow_part1 - ME309 Fall 2009...

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Unformatted text preview: ME309 Fall 2009 Lecture 25: Compressible Flow Andrew Lee Maurice J. Zucrow Laboratories Purdue University West Lafayette, Indiana The Mach Cone Let's consider a point source of sound that emits a pulse every t seconds Stationary 11/23/2009 Andrew Lee 2 The Mach Cone Let's consider a point source of sound that emits a pulse every t seconds V<C 11/23/2009 Andrew Lee 3 The Mach Cone Let's consider a point source of sound that emits a pulse every t seconds V=C 11/23/2009 Andrew Lee 4 The Mach Cone Let's consider a point source of sound that emits a pulse every t seconds = sin -1 1 M V>C 11/23/2009 Andrew Lee 5 The Mach Cone Example 12.4 In tests of a protective material, we wish to photograph bullet as it impacts a jacket made of the material. A camera is set up a perpendicular distance d from the target plane. We wish to determine the perpendicular distance d from the target plane at which the camera must be placed such that the sound of the bullet will trigger the camera at the impact time. Note: The bullet speed is measured to be 550 m/s; the delay time of the camera is 0.005 s. 5m d=? 11/23/2009 Andrew Lee 6 Propagation of Sound Waves 11/23/2009 Andrew Lee 7 Propagation of Sound Waves The speed of sound in a medium 11/23/2009 Andrew Lee 8 ...
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This note was uploaded on 04/28/2010 for the course ME 309 taught by Professor Merkle during the Spring '08 term at Purdue University-West Lafayette.

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Lecture%2025_Compressible%20Flow_part1 - ME309 Fall 2009...

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