Efficiency Methodologies for Chemical Reactions of JP-8

ABSTRACT: It is essential to have reliable reduced kinetic models that are capable of predicting transient combustion phenomena such as ignition and extinction under augmentor operating conditions. Combustion Science & Engineering, Inc. proposes to develop a robust, computationally efficient reduced kinetic modeling tool for aviation jet fuels that can be coupled with unsteady flow models such as LES to simulate static stability limits in augmentors. A three-prong attack is proposed in this project. CSE will develop computational tools to develop global reduced kinetic models using lumped-parameterization as well as time-scale based dimensional reduction methods such as Rate-Controlled Constrained- Equilibrium (RCCE) and Path Flux Analysis (PFA). Improvement to the computational efficiency of storage and retrieval of in-Situ Adaptive Tabulation (ISAT) using RCCE, and implementation of multi-timescale dynamic adaptive chemistry (MTS-DAC) scheme to save computational time for CFD simulations. Computational efficiency and accuracy will be improved in all areas that are critical to modeling reacting flows: the finite rate kinetic mechanisms and the implementation of the kinetics into turbulent combustion CFD. BENEFIT: The ultimate result of this research will be the development of a modeling tool that will be useful for engineers to design combustors, augmenters 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.