Author: James W. RussellPublisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 128
Book Description
An Empirical Method for Predicting the Mixing Noise Levels of Subsonic Circular and Coaxial Jets
Author: James W. RussellPublisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 128
Book Description
Empirical Source Noise Prediction Method with Application to Subsonic Coaxial Jet Mixing Noise
Author: W. E. ZorumskiPublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 82
Book Description
Empirical Source Noise Prediction Method with Application to Subsonic Coaxial Jet Mixing Noise
Author: W. E. ZorumskiPublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 84
Book Description
NASA Technical Paper
Author: Development of an Empirical Method for Predicting Jet Mixing Noise of Cold Flow Rectangular Jets
Author: James W. RussellPublisher:
ISBN:
Category : Acoustical engineering
Languages : en
Pages : 88
Book Description
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.
Development of an Empirical Methods for Predicting Jet Mixing Noise of Cold Flow Rectangular Jets
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781720478560
Category :
Languages : en
Pages : 98
Book Description
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
Scientific and Technical Aerospace Reports
Author: Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1126
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Scientific and Technical Information Output of the Langley Research Center for Calendar Year 1984
Author: Monthly Catalog of United States Government Publications
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 974
Book Description
AGARD Conference Proceedings
Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and DevelopmentPublisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 386
Book Description