Large Eddy Simulations of Hot Supersonic Jets for Aeroacoustics

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$744,193.00
Award Year:
2011
Program:
STTR
Phase:
Phase II
Contract:
N68335-11-C-0026
Agency Tracking Number:
N09A-008-0009
Solicitation Year:
2009
Solicitation Topic Code:
N09-T008
Solicitation Number:
2009.A
Small Business Information
Cascade Technologies Incorporated
2445 Faber Place, #100, Palo Alto, CA, -
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
179576715
Principal Investigator:
Yaser Khalighi
Technical Lead
(650) 521-0243
khalighi@turbulentflow.com
Business Contact:
Shoreh Hajiloo
General Manager
(650) 521-0243
hajiloo@turbulentflow.com
Research Institution:
California Institute of Technology
Mary Gibson
1200 East California Blvd.,
Mail Code 201-15
Pasadena, CA, 91125-
(626) 395-2494
Nonprofit college or university
Abstract
LES will be used to calculate flow and noise issuing from realistic engine configurations such as realistic engine nozzle throats, serrated nozzles, straight ramp diffusers, and over/under expanded operation. Nozzle geometry and operating conditions can be specified by the government with the objective of validating noise prediction capability on the basis of realistic parameters. Where necessary, additional testing will be conducted by UTRC to generate data sets representative of military engines entering into service today. LES results will be used to provide data to improve the fidelity of nonlinear PSE models. These models will be exercised in order to investigate how nozzle design affects the mechanisms of noise radiation. Compared to Phase I, a more rigorous data processing routines to much longer time series from LES will be conducted, we will run more NPSE cases with higher numbers of modes and to insure that there are not convergence problems with the PSE approach. In addition, modeling of nonlinear effects in PSE models will be supplemented with sub-grid-scale models to account for interaction of wavepackets with fine-scale turbulence.

* information listed above is at the time of submission.

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