Chemical Kinetics for Vitiated Flows
Agency / Branch:
DOD / USAF
The flame stability in typical augmenters is largely determined by vitiated air composition and high preheat temperature of the incoming flow. Presence of significant quantities of CO2 and H2O in the vitiated air will affect the oxidation characteristics of jet fuels by increasing the third-body collision efficiencies of initiation and recombination reactions. Traditionally, kinetic models are validated against data acquired for unvitiated air. Thus, it is essential to validate the kinetic models against data obtained at typical augmenter operating conditions. Combustion Science & Engineering, Inc. proposes to acquire new experimental data using vitiated air at low pressures for JP8 and S8 fuels. The data will include sub-atmospheric pressure ignition delay time data (at CSE), atmospheric laminar flame speed data (at Georgia Tech) and sub-atmospheric pressure laminar flame speed experiments (at Princeton University). CSE will also develop a model reduction tool to generate reduced models from detailed kinetic mechanisms that are validated against the experimental data acquired in this project. These reduced kinetic models can be implemented in CFD for practical augmenter simulations for commercial applications. BENEFIT: The ultimate result of this research will be the development of a CFDC modeling tool that will be useful for engineers to design augmentors and other flameholding devices in practical applications. This will provide a design tool for predicting static stability limits and flame propagation in afterburner combustion systems. The market for this product will include gas turbine designers and manufacturers for both military and civilian aircraft. The use of this tool will significantly reduce development costs by eliminating some design iterations and hardware testing, which is quite expensive and time-consuming.
Small Business Information at Submission:
COMBUSTION SCIENCE & ENGINEERING, INC.
8940 Old Annapolis Road Suite L Columbia, MD 21045
Number of Employees: