Download or read book The Generation and Radiation of Supersonic Jet Noise Jet flow measurement and analysis with special emphasis on remote sensing devices written by Lockheed-Georgia Company and published by . This book was released on 1972 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Generation and Radiation of Supersonic Jet Noise Volume VI Jet Flow Measurement and Analysis with Special Emphasis on Remote Sensing Devices Crossed Beam Schlieren Laser Doppler Velocimeter Pulsed Laser Interferometer written by Michael J. Fisher and published by . This book was released on 1972 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report describes three remote sensing devices developed to measure jet exhaust fluctuating density gradients, mean and turbulent velocity and mean temperature are described. These instruments are a crossed-beam schlieren, a laser Doppler velocimenter, and a pulsed laser interferometer. A jet turbulence facility was developed, along with five 2 inch diameter jet nozzles (one convergent and four con-div, up to Mach 2.0), for the purpose of providing laboratory controlled conditions, in order to properly evaluate the remote sensing instruments. (Author).

Download or read book The Generation and Radiation of Supersonic Jet Noise Summary of supersonic jet noise studies written by and published by . This book was released on 1972 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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:

Download or read book The Generation and Radiation of Supersonic Jet Noise written by Lockheed-Georgia Company and published by . This book was released on 1972 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Generation and Radiation of Supersonic Jet Noise Volume 1 Summary of Supersonic Jet Noise Studies written by and published by . This book was released on 1972 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book The Generation and Radiation of Supersonic Jet Noise Progress toward a unified theory of jet engine noise written by Lockheed-Georgia Company and published by . This book was released on 1972 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Generation and Radiation of Supersonic Jet Noise Theory of turbulence generated jet noise noise radiation from upstream sources and combustion noise written by and published by . This book was released on 1972 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1995 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aeronautical Engineering written by and published by . This book was released on 1988 with total page 916 pages. Available in PDF, EPUB and Kindle. Book excerpt: A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA)

Download or read book The Generation and Radiation of Supersonic Jet Noise written by Geoffrey M. Lilley and published by . This book was released on 1972 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report presents a series of specific theoretical studies directed toward the solution of jet noise generation and radiation, upstream noise radiation and combustion noise generation. Three theories are presented. Lilley's work is a new theory of jet noise generation, based on identification of acoustic and source generation terms. The acoustic 'converted wave equation' derived includes the Pridmore-Brown/Mungur shear refraction term. Plumblee presents a theoretical analysis and numerical solution techniques for solving for the radiation field from a source within a jet flow and specifically deals with radiation from an acoustic distribution initally specified at the end of a circular exhaust duct termination through the jet flow to the surrounding medium. Finally, Strahle presents a theory on afterburner type combustion noise generation and radiation. Order of magnitude analyses are made in an attempt to estimate acoustic power levels and refraction effects are also investigated. (Author).

Download or read book The Generation and Radiation of Supersonic Jet Noise Volume 4 Shock Associated Noise Data written by and published by . This book was released on 1976 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Government Reports Index written by and published by . This book was released on 1973 with total page 972 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Generation and Radiation of Supersonic Jet Noise written by Lockheed-Georgia Company and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Generation and Radiation of Supersonic Jet Noise Volume 1 Summary written by and published by . This book was released on 1976 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains a summary of all the work accomplished in a detailed investigation of the noise characteristics of supersonic jet aircraft, as well as a summary of items in an exploratory program. There are three main sections. The first summarizes the problems with existing theories at the time the contract was initiated. The second outlines the criteria for a unified self-consistent theory of aerodynamic noise generation, and presents, a brief derivation of Lilley's equation which is the basis for the theoretical studies in jet noise generation and radiation. The third section summarizes the work accomplished.

Download or read book The Generation and Radiation of Supersonic Jet Noise written by Philip Ellis Doak and published by . This book was released on 1972 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Existing theories of aerodynamic noise generation are critically reviewed with special emphasis on conceptual adequacy and physical scope with special reference to supersonic jet noise. In this review the basic work of Stokes, Kirchoff and Rayleigh on fluctuating motions in fluids is recalled and developed to provide a firm basis for the critique. The advantages and disadvantages of acoustic analogy theories such as Lighthill's are thoroughly discussed in Section 11.3. A contribution is made towards removing the criticisms made by Lighthill of Ribner's 'isotropic source tensor' theory. New developments such as those by Crow, Lilley and Doak are emphasized. On the basis of the evidence provided by the critical review, a new unified theory for jet noise has been devised. (Author).