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How to satisfy the takeoff noise requirements for a supersonic transport

Michel, Ulf (1987) How to satisfy the takeoff noise requirements for a supersonic transport. AIAA 11th Aeroacoustics Conference, 19. - 21. Oktober 1987, Palo Alto, California, USA.

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Abstract

The noise during takeoff of a supersonic transport is calculated for the flyover and the lateral reference noise measurement points defined by ICAO Annex 16. Only the contribution of jet mixing noise is considered. The influences of the following parameters are considered: jet speed, aircraft weight, aircraft wing loading, aircraft lift-to-drag ratio, and the amount of power cutback after takeoff. The influence of the takeoff procedure is also studied. It is shown that jet speed has the largest influence of all parameters and that values of about 400 m/s or less are required to satisfy the noise limits that are currently valid for subsonic aircraft. Such low jet speeds can be achieved by choosing large engine bypass ratios or by employing ejector mixers with large nozzle exit diameters. The first solution may be difficult to realize technically for a supersonic transport, the second solution requires that the mixer can be fully retracted, which may be impossible because of its size.

Document Type:Conference or Workshop Item (Paper)
Title:How to satisfy the takeoff noise requirements for a supersonic transport
Authors:
AuthorsInstitution or Email of Authors
Michel, Ulfulf.michel@dlr.de
Date:19 October 1987
Status:Published
Keywords:jet noise, supersonic transport, noise limits
Event Title:AIAA 11th Aeroacoustics Conference
Event Location:Palo Alto, California, USA
Event Type:international Conference
Event Dates:19. - 21. Oktober 1987
Organizer:American Institute of Aeronautics and Astronautics
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Quiet Air Traffic (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Prof. Dr.-Ing. Ulf Michel
Deposited On:14 Apr 2010 16:26
Last Modified:14 Apr 2010 16:26

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