The Generation and Radiation of Supersonic Jet Noise: Future studies for definition of supersonic jet noise generation and reduction mechanisms PDF Download
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Author:
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 52
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Book Description
Author:
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 52
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Book Description
Author: Harry E. Plumblee
Publisher:
ISBN:
Category :
Languages : en
Pages : 46
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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:
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 694
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Author:
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 50
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 47
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Book Description
This is a summary report of the results of a 13-month research program on the generation and reduction of supersonic jet noise. This program was planned as the first phase of a four-phase effort. Tasks compromising this Phase 1 program were as follows: reviews and evaluation of existing theoretical models for supersonic jet noise generation and radiation; development of the framework of a new, unified theory of aerodynamic noise; development of a new theoretical model of turbulent mixing region noise; development of a new theoretical model for calculating propagation and radiation of upstream noise; a preliminary review of combustion noise; tests on turbulent mixing region noise and shock-associated noise; review of the problems of jet flow measurement and analysis; development of new instrumentation for jet flow measurement; establishment of full facilities for the total program; formulation of the program for future studies.
Author: Lockheed-Georgia Company
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 194
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Author: Lockheed-Georgia Company
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 156
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Book Description
Author: Lockheed-Georgia Company
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 322
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 416
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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.
