Chemical Kinetic Model Reduction and Efficient Implementation Strategies for Hypersonic Propulsion Applications

摘要

For hypersonic propulsion conditions of interest, several mechanism reduction strategies have been developed by taking advantage of broad range of chemical time scales under high temperature conditions. The reduction methodologies include application of (ⅰ) principal component analysis based on sensitivity of ignition, flame propagation, extinction limits and partially-stirred reactor simulations to extract skeletal reaction models, (ⅱ) quasi-steady state approximation to obtain reduced reaction models, and (ⅲ) rate-controlled constraint-equilibrium dimension reduction method to represent the chemistry using a reduced set of represented species. In addition, implementation of the in-situ adaptive tabulation approach to partially-stirred reactor simulations has been demonstrated for a set of selected mixing conditions relevant for turbulent reacting flows. In this paper, the above model reduction approaches have been applied to a newly optimized ethylene-air detailed kinetic model.