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Acoustic Signature of a Supersonic Jet Emanating from a Rectangular C-D Nozzle

Haukur Hafsteinsson (Institutionen för tillämpad mekanik, Strömningslära) ; Niklas Andersson (Institutionen för tillämpad mekanik, Strömningslära) ; Bhupatindra Malla ; Ephraim Gutmark
54th AIAA Aerospace Sciences Meeting, 2016, San Diego, United States, 4-8 January 2016 (2016)
[Konferensbidrag, refereegranskat]

We live in a world with ever increasing air traffic and the demand for fuel efficient low noise emitting aircraft is high. The use of blended wing bodies (BWB) has gained interests within the aerospace industry due to its potential for reduced fuel consumption. These type of aircraft are generally equipped with rectangular nozzles. The drawback of such nozzles is increased instability of the emanating jet which increases the risk of higher noise radiation. Understanding the instability patterns and the underlying flow physics is therefore the key to improved stability and reduced noise. In the presented paper, an LES/CAA approach is utilized to predict the flow dynamics and the radiated noise from a rectangular nozzle. The nozzle is operated at underexpanded conditions. The simulations are compared with experiments and are used as a complement to the experimental data for improved understanding of the flow physics. The supersonic jet is found to exhibit an intense flapping motion followed by a large jet spreading in the minor-axis plane. In general, the prediction of the most amplified frequency and higher harmonics observed in the near-field and far-field spectra is in agreement with the experiment. Two types of flow events associated with the generation of high amplitude acoustic waves are detected. These events are identified as vortex-collision and shock-leakage through the shear layer.

Nyckelord: LES, CAA, Supersonic Jet, Aeroacoustics

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Denna post skapades 2016-01-20. Senast ändrad 2017-03-03.
CPL Pubid: 231008


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Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Strömningslära (2005-2017)


Hållbar utveckling
Strömningsmekanik och akustik

Chalmers infrastruktur

C3SE/SNIC (Chalmers Centre for Computational Science and Engineering)