Download or read book The Use of Acoustic Scale Models for Investigating Near Field Noise of Jet and Rocket Engines written by Walter V. Morgan and published by . This book was released on 1961 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Use of Acoustic Scale Models for Investigating Near Field Noise of Jet and Rocket Engines written by and published by . This book was released on 1961 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Use of Acoustic Scale Models for Investigating Near Field Noise of Jet and Rocket Engines written by Walter V. Morgan and published by . This book was released on 1961 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analytical and experimental studies have been made to examine the feasibility of using acoustic scale models for near field noise investigations. Analyses show that the important characteristics of noise generation, propagation, and measurement can be scaled. A few deviations from this involve small errors which are negligible in the near field. The most straightforward model duplicates the gas flow parameters of the full scale engine. The validity of such models has been demonstrated by a series of tests for a wide variety of nozzle exit conditions, from turbojet through rocket exhausts, and whether in a free field or in the presence of objects which interfere with the flow, such as shaped nozzles and flame deflectors. It is further determined both analytically and experimentally that models may be simplified without impairing the results of a scaled test. Considerations in simplifying a model include: reduction of the nozzle size; absence or presence of reflecting surfaces; use of fewer than the full scale number of engines; and use of a substitute gas which is different from and at a lower temperature than that in the full scale engine.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Environmental Effects on Materials and Equipment written by and published by . This book was released on 1962 with total page 856 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1966 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Environmental Effects on Materials Equipment written by and published by . This book was released on 1962 with total page 846 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book WADC University of Minnesota Conference on Acoustical Fatigue written by Walter J. Trapp and published by . This book was released on 1961 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Astronautics Information Literature Search written by Jet Propulsion Laboratory (U.S.) and published by . This book was released on 1963 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies of Rocket Noise Simulation with Substitute Gas Jets and the Effect of Vehicle Motion on Jet Noise written by Walter V. Morgan and published by . This book was released on 1963 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: The feasibility of using helium jets as a practical substitute for actual rockets in scale model acoustic tests was investigated by conducting an experimental program with four heated helium models. Sufficient evidence is presented to indicate that the substitute gas modeling concept is valid, i.e., simulation of rocket noise can be achieved if the essential rocket flow parameters are duplicated. It is not possible to duplicate all flow parameters simultaneously and retain the essential feature of simplicity; compromises must be made. The helium model per formed best. This evaluation is based on agree ment in sound pressure levels with a small solid propellant rocket. An investigation was made to determine the effect of flight vehicle motion on propulsion system noise propagated to parts of the vehicle located in the near field. Ex periments were performed using a 0.6-in. diam eter heated air jet operating in a 16-in. diameter acoustically-treated wind tunnel. Experi mental results compare favorably with predic tions based on the hypothesis which explains the effect of vehicle motion by two separate factors: the noise produced by a jet in motion depends on the relative velocity between the jet and the air through which it moves; and a shifting of the noise radiation pattern toward the rear occurs because of combined effects of vehicle motion and the finite velocity of sound.

Download or read book Supression of Jet Noise with Emphasis on the Near Field written by Kenneth M. Eldred and published by . This book was released on 1963 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography of Scientific and Industrial Reports written by and published by . This book was released on 1963 with total page 1018 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book WADC Technical Report written by United States. Wright Air Development Division and published by . This book was released on 1959 with total page 1318 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Flames and Flame Properties written by Defense Documentation Center (U.S.) and published by . This book was released on 1964 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ASD Technical Report written by and published by . This book was released on 1961 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contribution of Combustion Noise to Overall Rocket Exhaust Jet Noise written by Loren E. Bollinger and published by . This book was released on 1966 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NASA Contractor Report written by and published by . This book was released on 1974 with total page 1460 pages. Available in PDF, EPUB and Kindle. Book excerpt: