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Further Progress in Noise Source Identification in High Speed Jets via Causality Principle

Further Progress in Noise Source Identification in High Speed Jets via Causality Principle

          
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About the Book

To locate noise sources in high-speed jets, the sound pressure fluctuations p/, measured at far field locations, were correlated with each of density p, axial velocity u, radial velocity v, puu and pvv fluctuations measured from various points in fully expanded, unheated plumes of Mach number 0.95, 1.4 and 1.8. The velocity and density fluctuations were measured simultaneously using a recently developed, non-intrusive, point measurement technique based on molecular Rayleigh scattering (Seasholtz, Panda, and Elam, AIAA Paper 2002-0827). The technique uses a continuous wave, narrow line-width laser, Fabry-Perot interferometer and photon counting electronics. The far field sound pressure fluctuations at 30 to the jet axis provided the highest correlation coefficients with all flow variables. The correlation coefficients decreased sharply with increased microphone polar angle, and beyond about 60 all correlation mostly fell below the experimental noise floor. Among all correlations showed the highest values. Interestingly,, in all respects, were very similar to . The and correlations with 90deg microphone fell below the noise floor. By moving the laser probe at various locations in the jet it was found that the strongest noise source lies downstream of the end of the potential core and extends many diameters beyond. Correlation measurement from the lip shear layer showed a Mach number dependency. While significant correlations were measured in Mach 1.8 jet, values were mostly below the noise floor for subsonic Mach 0.95 jet. Various additional analyses showed that fluctuations from large organized structures mostly contributed to the measured correlation, while that from small scale structures fell below the noise floor. Panda, J. and Seasholtz, R. G. and Elam, K. A. Glenn Research Center NASA/TM-2004-212385, AIAA Paper 2003-3126, E-13963 WBS 22-714-08-14 NOISE (SOUND); JET AIRCRAFT NOISE; RAYLEIGH SCATTERING; SOUND PRESSURE; NOISE GENERATORS; PRESSURE OSCILLATIONS; SUBSONIC FLOW; SHEAR LAYERS; NONINTRUSIVE MEASUREMENT; MACH NUMBER


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Product Details
  • ISBN-13: 9798672396224
  • Publisher: Independently Published
  • Publisher Imprint: Independently Published
  • Height: 280 mm
  • No of Pages: 34
  • Spine Width: 2 mm
  • Width: 216 mm
  • ISBN-10: 8672396227
  • Publisher Date: 10 Aug 2020
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 104 gr


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