Host: The Japan Society of Mechanical Engineers
Name : The Ninth International Conference on Modeling and Diagnostics for Advanced Engine Systems (COMODIA 2017)
Date : July 25, 2017 - July 28, 2017
Chemical kinetics of natural gas combustion receives much attention for the improvement of gas turbine engines with the difficulties of flashback, blow-off and combustion instabilities. This study aimed to develop a skeletal reduction mechanism for the combustion of natural gas. By using a detailed chemical kinetics mechanism of acyclic saturated hydrocarbons composed of up to C7 species, we found that methane, ethane, propane, and n-butane are surrogate components for the prediction of ignition delay time and laminar flame velocity of natural gas. Although minor components from C5 to C7 enhance the reactivity at lower temperatures, the mixture in which these minor species are replaced into n-butane can reproduce the ignition delay time of original natural gas within 25% error. Then, we performed the reaction path and sensitivity analysis for the combustion of surrogate components by using a detailed chemical kinetics mechanism, and identified the unnecessary species based on the 5% of branching ratio and sensitivity. The present skeletal reduction mechanism which includes 77 species and 334 reactions can reproduce the ignition delay times and laminar flame velocities predicted by detailed chemical mechanism.
