The Prediction and Analysis of Jet Flows and Scattered Turbulent Mixing Noise about Flight Vehicle Airframes
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The Prediction and Analysis of Jet Flows and Scattered Turbulent Mixing Noise about Flight Vehicle Airframes

The Prediction and Analysis of Jet Flows and Scattered Turbulent Mixing Noise about Flight Vehicle Airframes


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About the Book

Jet flows interacting with nearby surfaces exhibit a complex behavior in which acoustic and aerodynamic characteristics are altered. The physical understanding and prediction of these characteristics are essential to designing future low noise aircraft. A new approach is created for predicting scattered jet mixing noise that utilizes an acoustic analogy and steady Reynolds-averaged Navier-Stokes solutions. A tailored Green's function accounts for the propagation of mixing noise about the air-frame and is calculated numerically using a newly developed ray tracing method. The steady aerodynamic statistics, associated unsteady sound source, and acoustic intensity are examined as jet conditions are varied about a large at plate. A non-dimensional number is proposed to estimate the effect of the aerodynamic noise source relative to jet operating condition and airframe position. The steady Reynolds-averaged Navier-Stokes solutions, acoustic analogy, tailored Green's function, non- dimensional number, and predicted noise are validated with a wide variety of measurements. The combination of the developed theory, ray tracing method, and careful implementation in a stand-alone computer program result in an approach that is more first principles oriented than alternatives, computationally efficient, and captures the relevant physics of fluid-structure interaction. Miller, Steven A. Langley Research Center JET AIRCRAFT NOISE; JET MIXING FLOW; TURBULENT MIXING; AEROACOUSTICS; RAY TRACING; PREDICTION ANALYSIS TECHNIQUES; AIRFRAMES; GREEN'S FUNCTIONS; COMPUTER PROGRAMS; ANALOGIES; AERODYNAMIC CHARACTERISTICS; LOW NOISE; REYNOLDS EQUATION; REYNOLDS AVERAGING


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Product Details
  • ISBN-13: 9781719503693
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 279 mm
  • No of Pages: 58
  • Spine Width: 3 mm
  • Width: 216 mm
  • ISBN-10: 1719503699
  • Publisher Date: 22 May 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 159 gr


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