The Research Of One-step Hydrogen/Air Reaction Kinetic Mechanism Based On The Prediction Of Ignition Delay Time

With the development of computer technology and numerical theories, numerical simulation has become an important research method in combustion science. However, to figure out the chemical kinetic mechanism of fuel combustion accurately is the foundation and premise for research of fuel combustion characteristic, such as ignition characteristics, flame transmitting characteristics, etc., through numerical simulation.This article regarded the chemical kinetic mechanism of hydrogen combustion as the object of research, simplified the detailed chemical kinetic mechanism by adjusting the arrhenius parameters(pre-exponential factor, temperature coefficient and activation energy) in the reaction rate expression of its one-step reduced chemical reaction. A result that the ignition delay time of one-step reduced kinetic mechanism equaled to that of detailed chemical kinetic mechanism was achieved under the same initial conditions(initial temperature, pressure and excess air coefficient).First, the activation energy which ensured that the ignition delay time of one-step reduced kinetic mechanism equaled to that of detailed chemical kinetic mechanism was obtained by using the Chemkin burning software. Then the activation energy of the unknown state, which could be used to calculate the ignition delay time of the one-step reduced kinetic mechanism was obtained by using the three-dimensional linear interpolation method. Finally, the feasibility and practicability of this method were verified by demonstrating the interpolation results and the comparison results with other one-step mechanisms. At the same time, it indicated that the one-step reduced kinetic mechanism can replace the detailed chemical reaction mechanism effectively.