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Author : W. C. Sperry
Publisher :
ISBN 13 :
Total Pages : 394 pages
Book Rating : 4.3/5 (91 download)
Download or read book Fundamental Study of Jet Noise Generation and Suppression written by W. C. Sperry and published by . This book was released on 1960 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Der unfehlbare Ratten und Mäuse-, als auch Hamster- ... und Motten-Vertilger ... written by and published by . This book was released on 1864 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : W. C. Sperry
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.3/5 (91 download)
Download or read book Fundamental Study of Jet Noise Generation and Suppression written by W. C. Sperry and published by . This book was released on 1961 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Erik Leonard Mollø-Christensen
Publisher :
ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.:/5 (135 download)
Download or read book Jet Noise Generation and Suppression written by Erik Leonard Mollø-Christensen and published by . This book was released on 1959 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : W. R. Semrau
Publisher :
ISBN 13 :
Total Pages : 240 pages
Book Rating : 4.:/5 (19 download)
Download or read book Research on Jet Noise Generation and Suppression written by W. R. Semrau and published by . This book was released on 1964 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental and analytical investigations on jet noise generation and suppression have resulted in a verification of the concept that jet noise is uniquely related to mean flow velocity distribution in the jet wake. Advances have been made in analytical techniques for calculating aerodynamic properties of free jet flow and the related acoustic properties of the flow and verification of the assumption that negligible attenuation of sound occurs during propagation through multi-element jet flows has been achieved. Investigation of selective water injection as a jet noise suppression scheme has indicated little promise for in-flight noise reduction. Studies of noise generation by high temperature and high pressure ratio jets have extended the state-of-the-art in the area of high temperature flow noise suppression, and have resulted in a means for predicting total acoustic power beyond the limits of applicability of the Lighthill parameter. (Author).
Author : W. C. SPERRY
Publisher :
ISBN 13 :
Total Pages : 1 pages
Book Rating : 4.:/5 (227 download)
Download or read book Fundamental Study of Jet Noise Generation and Suppression written by W. C. SPERRY and published by . This book was released on 1960 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: THE FUNDAMENTAL ASPECTS OF JET NOISE GENERATION AND SUPPRESSION ARE EXAMINED AND EVALUATED. Initially, the basic equations of acoustics and fluid dynamics are considered with respect to the usual simplifying assumptions; the non-linear characteristics that lead to increased generality are emphasized. The Lighthill theory of subsonic jet stream noise and theories of supersonic jet stream noise are studied and extended. An analytical representation for the sound field surrounding a jet is provided which yields a solution giving some insight to noise generating mechanisms. Finally, a general review and analysis is provided of the experimental studies of others concerning jet noise generation and suppression. Volume I contains the technical details and Volume II is a bibliography. (Author).
Author : General Electric Company
Publisher :
ISBN 13 :
Total Pages : 451 pages
Book Rating : 4.:/5 (35 download)
Download or read book Research Investigation of the Generation and Suppression of Jet Noise written by General Electric Company and published by . This book was released on 1961 with total page 451 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : University of Tennessee (Knoxville campus). Space Institute
Publisher :
ISBN 13 :
Total Pages : 666 pages
Book Rating : 4.E/5 ( download)
Download or read book Proceedings of a Short Course on "Noise Generation and Suppression in Aircraft," Held at the University of Tennessee Space Institute, Tullahoma, Tennessee, January 29-February 2, 1968 written by University of Tennessee (Knoxville campus). Space Institute and published by . This book was released on 1968 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Elizabeth Isakson
Publisher :
ISBN 13 :
Total Pages : 57 pages
Book Rating : 4.:/5 (222 download)
Download or read book Fundamental Study of Jet Noise Generation and Suppression written by Elizabeth Isakson and published by . This book was released on 1963 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 211 pages
Book Rating : 4.:/5 (227 download)
Download or read book Fundamental Study of Jet Noise Generation and Suppression. Volume 1. Experimental and Theoretical Investigations of Model Jet Exhaust Stream Noise and the Development of Normalizing Parameters for Size and Temperature written by and published by . This book was released on 1963 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: Part 1: Far-field sound pressure levels were measured in an anechoic room for noise generated by cold air flow through a wide variety of small nozzle configurations including converging, converging diverging, and annular types with and without center core flow. The results are examined in terms of flow and acoustic power performance, directivity, and power spectral density. Normalization parameters are developed for both size and temperature which show good agreement between flow and acoustic performance of small cold jet nozzles, large hot jet nozzles, and jet engines. A particular configuration of annular plug nozzles exhibited remarkably good acoustic performance with no measurable loss of mass flow performance. Part 2: A simplified theory on the acoustical attenuation qualities of an extended plug nozzle is presented. The theory is based upon similarity relationships and on the location of shock structure, a parameter which remains constant in supersonic flow. Theoretical curves of noise attenuation versus nozzle geometrical parameters show reasonable agreement with our experimental cold jet results for a nozzle exhibiting ten to fifteen decibels reduction over a wide mass flow range. Design criteria is given which indicate that twenty or more decibels reduction may be accomplished by an optimally designed nozzle.
Download or read book The Generation and Radiation of Supersonic Jet Noise: Future studies for definition of supersonic jet noise generation and reduction mechanisms written by and published by . This book was released on 1972 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : MARGARET. EMMITT
Publisher :
ISBN 13 :
Total Pages : 1 pages
Book Rating : 4.:/5 (227 download)
Download or read book Fundamental Study of Jet Noise Generation and Suppression. Volume Ii. Bibliography written by MARGARET. EMMITT and published by . This book was released on 1960 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: The bibliography is divided into two parts. The first part (AD-264 919) consists of unannotated references chosen from the 1150 documents which were evaluated during the program. They are considered to be significant contributions to the basic subject categories mentioned above. These references are arranged chronologically by year and within each year alphabetically according to author. The second part consi ts of annotated references which were essential to the theoretical discussions to be found in Volume I. They are arranged alphabetically according to author. The name or names of the scientific personnel who selected each reference follows each annotation. (Author).
Author : Harry E. Plumblee
Publisher :
ISBN 13 :
Total Pages : 46 pages
Book Rating : 4.:/5 (227 download)
Download or read book The Generation and Radiation of Supersonic Jet Noise. Volume II. Future Studies for Definition of Supersonic Jet Noise Generation and Reduction Mechanisms written by Harry E. Plumblee and published by . This book was released on 1972 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : J. T. Kelsall
Publisher :
ISBN 13 :
Total Pages : 23 pages
Book Rating : 4.:/5 (227 download)
Download or read book Suppression of Refraction in Jet Noise by Cooling written by J. T. Kelsall and published by . This book was released on 1975 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Noise generation in an air jet can be described in terms of a convection factor. The velocity gradients in the flow refract the sound, giving rise to a commonly observed final directivity. In the experiments outlined here the effects of convection and refraction on directivity are examined for a jet of very cold air. An attempt is made to determine whether any interdependence between convection and refraction can be detected experimentally in narrow band jet noise data. In the reported investigation liquid nitrogen was used to cool a jet of air (at nozzle speeds 0.21 to 0.28 of ambient sound speed) down to temperatures (between -110C and -155C) at which the refraction from the opposed velocity and temperature gradients produced cancellation effects.
Author : T. F. Balsa
Publisher :
ISBN 13 :
Total Pages : 719 pages
Book Rating : 4.:/5 (227 download)
Download or read book High Velocity Jet Noise Source Location and Reduction written by T. F. Balsa and published by . This book was released on 1978 with total page 719 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the results of Task 2 conducted under the subject program over a period of 45 months. Task 2 was formulated as a fundamental theoretical and experimental study aimed at an understanding of the noise generation and suppression mechanisms of high velocity jets. The mechanisms investigated included changes in turbulence structure, fluid shielding, and alteration of convective amplification of jet noise sources. Several other areas such as physical shielding, shock associated noise, lip noise, effect of fluid/particle additives on jet noise, orderly structure in jets, ejector aeroacoustics, and flight effects on jet noise were also investigated. The most significant achievements of Task 2 were as follows. A unified aeroacoustic theory composed of three ingredients were developed: (1) the prediction of mean properties of the jet plume, (2) deduction of turbulence properties relevant to jet noise by similarity arguments, and (3) the prediction of far-field noise including the effects of fluid shielding. A semiempirical shock noise prediction procedure was also developed. Exhaustive theory-data comparisons for a wide range of nozzle configurations and velocity/temperature combinations were conducted and have confirmed the essential validity of this model as a prediction tool. A comprehensive series of experiments with simple suppressor elements (such as a single rectangular tube, twin jets, linear arrays of jets, circular arrays of jets) was carried out and revealed the importance of acoustic shielding by adjacent jets. A fundamental series of experiments, specifically tailored to reveal fluid shielding as a jet noise suppression mechanism, was successfully conducted.
Author : A.S. Ginevsky
Publisher : Springer Science & Business Media
ISBN 13 : 9783540201434
Total Pages : 264 pages
Book Rating : 4.2/5 (14 download)
Download or read book Acoustic Control of Turbulent Jets written by A.S. Ginevsky and published by Springer Science & Business Media. This book was released on 2004-01-22 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph presents recent results of experimental research relating to control of aerodynamic and acoustic characteristics of subsonic and supersonic turbulent jets by acoustic excitation of different intensity and frequency. Coherent structures in subsonic turbulent jets and their sensibility to harmonic acoustic excitation are studied, as well as the generation and suppression of turbulence in subsonic jets under acoustic excitation. The book covers active and passive methods of controlling supersonic non-isobaric jet characteristics and, in particular, suppression of discrete components of aerodynamic jet noise. Numerical simulation methods of subsonic turbulent jets are analyzed. Examples of practical realization of the presented methods are given in application to jet noise reduction of turbojet engines and to auto-oscillation suppression in wind tunnels with open test section.
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721139750
Total Pages : 106 pages
Book Rating : 4.1/5 (397 download)
Download or read book Jet Noise Modeling for Supersonic Business Jet Application written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-15 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document describes the development of an improved predictive model for coannular jet noise, including noise suppression modifications applicable to small supersonic-cruise aircraft such as the Supersonic Business Jet (SBJ), for NASA Langley Research Center (LaRC). For such aircraft a wide range of propulsion and integration options are under consideration. Thus there is a need for very versatile design tools, including a noise prediction model. The approach used is similar to that used with great success by the Modern Technologies Corporation (MTC) in developing a noise prediction model for two-dimensional mixer ejector (2DME) nozzles under the High Speed Research Program and in developing a more recent model for coannular nozzles over a wide range of conditions. If highly suppressed configurations are ultimately required, the 2DME model is expected to provide reasonable prediction for these smaller scales, although this has not been demonstrated. It is considered likely that more modest suppression approaches, such as dual stream nozzles featuring chevron or chute suppressors, perhaps in conjunction with inverted velocity profiles (IVP), will be sufficient for the SBJ. Stone, James R. and Krejsa, Eugene A. and Clark, Bruce J. Glenn Research Center NAS3-00178; WBS-22-781-30-12
