THE DERIVATION AND IMPLEMENTATION OF REDUCED KINETIC MODELS FOR PRACTICAL AVIATION FUELS

Combustion chemistry has a key role in the design of low emission and high speed propulsion. The knowledge of the chemistry of relevant practical fuels has reached the point where design problems can in principle be addressed from a rigorous scientific perspective. However, the introduction of detailed chemical reaction mechanisms into complex design computations is not practical at the present time. Systematic reduction approaches have found general application in the area of combustion chemistry and it has been shown that large gains in computational efficiency may be achieved. Inevitable difficulties arise due to the numeric properties of heavily reduced mechanisms and the range of applicability of such mechanisms is often severely curtailed. Limitation of this type may be essentially removed through the use of in site adaptive tabulation techniques (ISAT) which permit consideration of a much larger number of species. Efficiency gains of about 1000 times, compared to the approach of direct integration of the corresponding rate equations, may be obtained. The technique is also ideally suited for use in conjunction with transported pdf calculations of reactive turbulent flows. The present proposal outlines the most promising route for the implementation of aviation fuel chemistry into design computations.