Author : Arthur W. Goldstein
Publisher :
Page : 102 pages
File Size : 19,88 MB
Release : 1970
Category : Airplanes
ISBN :
Low noise turbofan engine without aerodynamic blade loading.
Author :
Publisher :
Page : 642 pages
File Size : 13,39 MB
Release : 1977
Category :
ISBN :
Author :
Publisher :
Page : 1370 pages
File Size : 46,23 MB
Release : 1981
Category : Aeronautics
ISBN :
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author : United States. Superintendent of Documents
Publisher :
Page : 1252 pages
File Size : 28,99 MB
Release : 1973
Category : Government publications
ISBN :
February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index.
Author :
Publisher :
Page : 776 pages
File Size : 47,98 MB
Release : 1971
Category : Mechanics, Applied
ISBN :
Author :
Publisher :
Page : 356 pages
File Size : 45,57 MB
Release : 1978
Category : Aeronautics
ISBN :
Author :
Publisher :
Page : 1386 pages
File Size : 32,37 MB
Release :
Category : Government publications
ISBN :
Author : United States. Superintendent of Documents
Publisher :
Page : 1466 pages
File Size : 13,13 MB
Release : 1976
Category : United States
ISBN :
Author :
Publisher :
Page : 118 pages
File Size : 14,42 MB
Release : 1980
Category : Science
ISBN :
Author :
Publisher :
Page : 68 pages
File Size : 16,96 MB
Release : 1974
Category : Acoustical materials
ISBN :
An analysis procedure was developed for design of acoustically treated nacelles for high bypass turbofan engines. The plan was applied to the conceptual design of a nacelle for the quiet engine typical of a 707/DC-8 airplane installation. The resultant design was modified to a test nacelle design for the NASA Lewis quiet fan. The acoustic design goal was a 10 db reduction in effective perceived fan noise levels during takoff and approach. Detailed nacelle designs were subsequently developed for both the quiet engine and the quiet fan. The acoustic design goal for each nacelle was 15 db reductions in perceived fan noise levels from the inlet and fan duct. Acoustically treated nacelles were fabricated for the quiet engine and quiet fan for testing. Performance of selected inlet and fan duct lining configurations was experimentally evaluated in a flow duct. Results of the tests show that the linings perform as designed.
