Accession Number:

ADA422149

Title:

Aeroacoustic Optimization and Control

Descriptive Note:

Final technical rept. 1 Jan 2000-30 Sep 2002

Corporate Author:

CALIFORNIA UNIV LOS ANGELES

Report Date:

2003-04-02

Pagination or Media Count:

152.0

Abstract:

Much attention has been given to the jet noise problem since the jet engine became a power plant for aircraft after the Second World War, but there has been little modeling progress for realistic geometries. Scaling laws such as Lighthills famous P oc U8 sound-power scaling with jet exit velocity that are derived from these theories have been enormously successful in motivating higher bypass engines to reduce noise, but they have offered little further guidance for improvements through nozzle geometries or active flow control. The aircraft noise problem has recently become more pressing as both military and civilian use of air space increase. At present, the noise of some military aircraft is so intense that it can actually fatigue aircraft components. Airbase noise is becoming an important issue with several some successful lawsuits involved. Personnel are also affected - early predictionsresults suggest that the JSF landing in vertical mode will be too loud for ground personnel to tolerate. The civilian aerospace sector faces their own serious aircraft noise problems. Technology transfer from the present work supports intense noise control efforts at domestic aerospace companies as well.

Subject Categories:

  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE