CUED Publications database

On the mechanism and reduction of installed jet noise

Lyu, B and Dowling, AP (2017) On the mechanism and reduction of installed jet noise. In: UNSPECIFIED.

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Abstract

© 2017, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved. A experimental study of jet installation effects is conducted in this paper by operatinga cold jet at Mach number 0.5. Installed jet noise spectra at different observer angles are measured. Both H (the separation distance between the jet centerline and the at plate) and L (the distance between the jet nozzle and the trailing edge of the at plate) are varied and their effects on installed jet noise are investigated. The exponential dependence of installed jet noise on the separation distance H is clearly demonstrated. The experimental results are then compared with the earlier developed model of the authors. Excellent agreement is achieved at low frequencies, where the installation is mostly pronounced. Lobed nozzles are also included in this paper to study its impacts on installed jet noise. The study shows a 1 ~ 1:5 dB noise reduction over the whole frequency range, but little change to the installation effects, due to the use of lobed nozzles. The prediction model can therefore also be used to predict the installed jet noise for lobed nozzles.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Subjects: UNSPECIFIED
Divisions: Div A > Fluid Mechanics
Div A > Energy
Depositing User: Cron Job
Date Deposited: 01 Aug 2017 02:17
Last Modified: 03 Aug 2017 03:00
DOI: