Stability Models for Augmentor Design Tools and Technology Assessment

Award Information
Agency:
Department of Defense
Branch
Air Force
Amount:
$739,733.00
Award Year:
2008
Program:
STTR
Phase:
Phase II
Contract:
FA9550-08-C-0039
Award Id:
83308
Agency Tracking Number:
F064-033-0053
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
1330 Charleston Road, Mountain View, CA, 94043
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
179576715
Principal Investigator:
Shoreh Hajiloo
General Manager
(650) 691-6067
hajiloo@turbulentflow.com
Business Contact:
Paviz Moin
President
(650) 224-4882
moin@turbulentflow.com
Research Institution:
STANFORD UNIV.
Sashi Ram
320 Panama Street
Stanford, CA, 94305
(650) 723-2968
Nonprofit college or university
Abstract
Augmentors, increase the thrust of a gas turbine engine by burning additional fuel with hot engine exhaust gases. Maintaining flame stability over a wide range of operating conditions is desired. An understanding of the effects of geometry and combustion processes on the flame stability is required to design advanced, efficient, and stable augmentors. Key factors affecting flame stability are vitiation level of combustion products entering the augmentor, and flame holder vortex shedding. The effect of vitiated air on flame stability has not been analyzed. Flame holders stabilize the flame by creating recirculation wakes and low speed eddies, allowing more fuel to burn. A detailed computational fluid dynamics (CFD) analysis with state-of-the-art physical and chemical models in required for meaningful numerical simulation of the complex physics encountered which involves rapid mixing, recirculation around flame holders, vortex shedding downstream of the bluff bodies and corresponding instabilities. Another major factor in achieving flame stabilization of vitiated air combustion is the competition of auto-ignition and flame propagation. Therefore, in predictive modeling of augmentors, turbulent partially premixed combustion and propagation by auto-ignition fronts, have to be considered. Appropriate large-eddy simulation (LES) tools will be developed and will be validated against carefully designed experiments.

* information listed above is at the time of submission.

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