Turbulent Combustion Interaction Models for LES Simulations of High Speed Flow

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA8650-12-C-2246
Agency Tracking Number: O2-1216
Amount: $749,975.00
Phase: Phase II
Program: STTR
Awards Year: 2012
Solicitation Year: 2010
Solicitation Topic Code: OSD10-T001
Solicitation Number: 2010.B
Small Business Information
2445 Faber Place, #100, Palo Alto, CA, -
DUNS: 179576715
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Hung Le
 General Manager
 (650) 521-0243
 hle@cascadetechnologies.com
Business Contact
 Donna Carrig
Title: Chief Financial Officer
Phone: (650) 521-0243
Email: carrig@cascadetechnologies.com
Research Institution
 University of Michigan
 Krista L Campeau
 Wolverine Tower,1st Flr,R1066
3003 South State Street
Ann Arbor, MI, 48109-1274
 (734) 936-1289
 Nonprofit college or university
Abstract
This work will develop and validate a high-fidelity LES combustion model based on Flamelet Progress Variable approach for accurate prediction of high-speed turbulent combustion. The flamelet-modeling paradigm facilitates consideration of detailed reaction chemistry and complex turbulence-chemistry interaction, which is critical for high-speed hydrocarbon combustion. A work plan is proposed that integrates systematic model analysis using relevant DNS databases, algorithmic developments, and model validation against relevant experimental data. The Phase-II efforts will address critical modeling aspect that have been identified in Phase I in association with the prediction of JICF autoignition regimes, air-fuel mixing, and heat-transfer. To this end, it is proposed to develop and implement an unsteady flamelet progress-variable model in order to provide an accurate description of transient ignition regimes that are present in high-speed turbulent combustion regimes. To enable a computationally efficient chemistry representation technique that provides a rigorous error control, in situ adaptive tabulation (ISAT) will be employed. The unsteady flamelet-model will be extended to include the effect of heat losses. The models will be implemented in Cascade"s state-of-the-art unstructured LES solver, CharLES and it be used to simulate the HIFIRE Direct Connect Rig experiment for which a proof of concept LES was demonstrated in Phase I.

* Information listed above is at the time of submission. *

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