The Generation and Radiation of Supersonic Jet Noise. Volume V - Appendix II. Shock Associated Noise Data PDF Download
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Author: Peter A. Lush Publisher: ISBN: Category : Languages : en Pages : 243
Book Description
A series of experiments was conducted for the purpose of clearly isolating and quantifying the noise sources associated with supersonic jet noise and for establishing the effect of refraction on the radiated field of these sources, as well as establishing the range of validity of available theoretical formulas for predicting the radiation field characteristics of these sources. Shock-associated noise, both discrete and broadband, was investigated thoroughly. This Appendix contains sequences of data in the form of narrow band spectra illustrating the existence of these types of shock associated noise in the jet flows investigated. (Author).
Author: Peter A. Lush Publisher: ISBN: Category : Languages : en Pages : 243
Book Description
A series of experiments was conducted for the purpose of clearly isolating and quantifying the noise sources associated with supersonic jet noise and for establishing the effect of refraction on the radiated field of these sources, as well as establishing the range of validity of available theoretical formulas for predicting the radiation field characteristics of these sources. Shock-associated noise, both discrete and broadband, was investigated thoroughly. This Appendix contains sequences of data in the form of narrow band spectra illustrating the existence of these types of shock associated noise in the jet flows investigated. (Author).
Author: Publisher: ISBN: Category : Languages : en Pages : 416
Book Description
The characteristics of the sound field of shock-containing under- expanded jets are studied by measuring the noise from a two-inch diameter convergent nozzle over an extensive envelope of supercritical jet operating conditions. The measurements, which are accurate and comprehensive, were conducted in the Lockheed anechoic facility. The results are presented in this Volume in a systematic manner in the form of narrowband spectra. The details pertinent to the experimental program and the data presentation format are summarized below. The total noise spectrum from an incorrectly expanded jet flow contains discrete components (or screech) in addition to the basic turbulent mixing noise and the broadband shock-associated noise. In order to study the trends and dependencies of the broadband component accurately, it is vital to keep the contamination by screech to a minimum in the experimental program. In the present experiments, screech suppression was successfully achieved by wrapping all surfaces surrounding the nozzle exit with sound absorbing material, and incorporating a small projection inside the nozzle lip. This projection interrupts the feedback loop between the first shock and the nozzle exit plane, which has been previously proposed and verified as the physical mechanism of screech generation. The detailed calibration tests, conducted prior to the main shock-associated noise experiments, established that all results are essentially uncontaminated by the presence of screech.
Author: Peter A. Lush Publisher: ISBN: Category : Languages : en Pages : 172
Book Description
A series of experiments was conducted for the purpose of clearly isolating and quantifying the noise sources associated with supersonic jet noise and for establishing the effect of refraction on the radiated field of these sources, as well as the radiation field characteristics of these sources. Results from the turbulent-mixing tests and the shock-associated tests are appended to this report in separate volumes. The turbulence noise 1/3 octave corrected data appear in Appendix I and the shock-associated narrow-band spectra appear in Appendix 2. (Author).
Author: Robert H. Burrin Publisher: ISBN: Category : Languages : en Pages : 575
Book Description
A series of experiments was conducted for the purpose of clearly isolating and quantifying the noise sources associated with supersonic jet noise and for establishing the effect of refraction on the radiated field of these sources, as well as establishing the range of validity of available theoretical formulas for predicting the radiation field characteristics of these sources. Turbulent mixing region noise from a fully expanded supersonic flow exhausting from a well designed convergent-divergent nozzle was measured over a very wide range of operational parameters. This Appendix contains computer printouts obtained from a jet noise data analysis program for turbulent mixing region noise. (Author).
Author: Publisher: ISBN: Category : Languages : en Pages : 460
Book Description
This volume discusses (1) turbulent mixing noise tests and observations relative to effects of temperature and Mach number on intensity, directivity, and spectra; (2) numerical solutions of the Lilley theory for sound radiated from point sources simulating small-scale turbulence noise sources, and comparisons of these solutions with experimental data relating to temperature and velocity effects on directivity and spectra; (3) the theory describing the development of the large-scale coherent motion of the jet structure and the far- field noise radiated from this turbulence; (4) a detailed discussion and interpretation of the jet turbulence and mean velocity data; and (5) a comprehensive description of the shock-associated noise tests, a preliminary description of the broadband shock-associated noise model, and a discussion of shock-associated noise in the overall jet noise picture.
Author: Harry E. Plumblee Publisher: ISBN: Category : Languages : en Pages : 46
Book Description
The report contains a detailed list of proposed recommendations for work necessary to attain the goal of developing technology for significantly reducing supersonic aircraft propulsion system noise. The recommendations and proposed work task are based on the research findings reported in Volume 1 and Volumes 3-6 of this report. Recommendations for experimental and theoretical studies of turbulent-mixing jet noise, shock-associated noise and upstream noise are detailed in the technical plan. Also recommendations for improvements in instrumentation and noise suppression studies are listed. (Author).
Author: Peter A. Lush
Author: Peter A. Lush
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Author: Lockheed-Georgia Company
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Author: Peter A. Lush
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Author: Robert H. Burrin
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Author: Harry E. Plumblee