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Development of an Empirical Methods for Predicting Jet Mixing Noise of Cold Flow Rectangular Jets

Development of an Empirical Methods for Predicting Jet Mixing Noise of Cold Flow Rectangular Jets

          
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About the Book

This report presents an empirical method for predicting the jet mixing noise levels of cold flow rectangular jets. The report presents a detailed analysis of the methodology used in development of the prediction method. The empirical correlations used are based on narrow band acoustic data for cold flow rectangular model nozzle tests conducted in the NASA Langley Jet Noise Laboratory. There were 20 separate nozzle test operating conditions. For each operating condition 60 Hz bandwidth microphone measurements were made over a frequency range from 0 to 60,000 Hz. Measurements were performed at 16 polar directivity angles ranging from 45 degrees to 157.5 degrees. At each polar directivity angle, measurements were made at 9 azimuth directivity angles. The report shows the methods employed to remove screech tones and shock noise from the data in order to obtain the jet mixing noise component. The jet mixing noise was defined in terms of one third octave band spectral content, polar and azimuth directivity, and overall power level. Empirical correlations were performed over the range of test conditions to define each of these jet mixing noise parameters as a function of aspect ratio, jet velocity, and polar and azimuth directivity angles. The report presents the method for predicting the overall power level, the average polar directivity, the azimuth directivity and the location and shape of the spectra for jet mixing noise of cold flow rectangular jets.Russell, James W.Langley Research CenterAEROACOUSTICS; PREDICTION ANALYSIS TECHNIQUES; AERODYNAMIC NOISE; JET MIXING FLOW; COLD FLOW TESTS; ACOUSTIC FREQUENCIES; DATA REDUCTION; MICROPHONES; SCREECH TONES; SHOCK WAVES; NARROWBAND; AZIMUTH; NOZZLE GEOMETRY...


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Product Details
  • ISBN-13: 9781723948824
  • Publisher: Independently Published
  • Publisher Imprint: Independently Published
  • Height: 280 mm
  • No of Pages: 100
  • Spine Width: 5 mm
  • Width: 216 mm
  • ISBN-10: 1723948829
  • Publisher Date: 23 Sep 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 254 gr


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Development of an Empirical Methods for Predicting Jet Mixing Noise of Cold Flow Rectangular Jets
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