Nozzle Throat Optimization on Acoustics and Performance of a Supersonic Jet
Konferensbidrag (offentliggjort, men ej förlagsutgivet), 2012

Nozzles used in supersonic flight applications have flow contours that cause the flow to differ from isentropic nozzle flow, resulting in less than ideal nozzle performance. The impact of nozzle contour on performance is well quantified, however it is less clear how the nozzle contour affects supersonic jet noise. This work investigates differences in noise characteristics of a sharp throat and contoured throat nozzle to identify the dependencies of supersonic noise components on the nozzle design. The nozzles are designed to be thrust matched at fully expanded conditions. The throat contour does not significantly affect the acoustics at fully expanded conditions, although the nozzle efficiency is increased for the contoured throat nozzle. Contouring the throat causes the nozzle to have screech instabilities over a broader range of operating conditions when imperfectly expanded. A detailed PIV and LES investigation was used to explain the acoustics behavior at all conditions. Reducing the throat shock strength increased the nozzle exit shock strength and periodicity, subsequently increasing the susceptibility to screech. Nozzle performance is increased at all operating conditions with the contoured throat nozzle.

Supersonic Jet Noise Reduction.

CAA

LES

CFD

Författare

Cuppoletti Daniel

Gutmark Ephraim

Haukur Hafsteinsson

Chalmers, Tillämpad mekanik, Strömningslära

Lars-Erik Eriksson

Chalmers, Tillämpad mekanik, Strömningslära

Prisell Erik

18th AIAA/CEAS Aeroacoustics Conference 2012 (33rd AIAA Aeroacoustics Conference); ; 4 June 2012 through 6 June 2012

Styrkeområden

Transport

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

Drivkrafter

Innovation och entreprenörskap

Ämneskategorier

Strömningsmekanik och akustik

DOI

10.2514/6.2012-2256

ISBN

978-160086932-7