Study Of Reduced Primary Reference Fuel (PRF) Chemical Kinetic Mechanism And Experiment Of Shock Tube Test Bench

In order to reduce the internal combustion engine emissions and improve the combustion efficiency,it is necessary to study the combustion process of the internal combustion engine and explore the new combustion mode,which is indispensable to study the chemical kinetic mechanism of fuel combustion.Combustion and chemical reaction process in internal combustion engine is very complex,the need for detailed chemical kinetics of fuel to a certain degree of simplification in order to be coupled with the CFD software calculation.A detailed mechanism of primary reference fuel(PRF)involving 1034 components and 4236 base reactions is simplified by the direct relation graph method combining total packing method to a reduced mechanism involving 43 components and 137 base reactions.In order to verify the effectiveness of the reduced mechanism,this paper also builds a high-pressure atomization shock tube platform to measure the ignition delay of PRF under different fuel ratio,pressure,temperature and equivalent ratio.The simulation results of the reduced mechanism were compared with the experimental results and the reduced mechanism was modified based on the comparison results.The results show that the direct relationship graph method can be used to find the coupling relationship between the components in the mechanism.By controlling the relationship threshold,the large number of redundant components and reactions can be eliminated quickly and effectively.Combining the total packing method,the larger detailed mechanism can be simplified to a smaller,simpler mechanism.The experimental results show that the lower the equivalent ratio,the shorter the ignition delay(the temperature is above 1200K);the higher the temperature and pressure,the shorter the ignition delay;the PRF value has no significant effect on the ignition delay.The experimental results satisfy the Arrhenius theorem.Compared with the experimental results,the reduced mechanism simulation results of the PRF fuel ignition delay in the corresponding experimental conditions show that the total system reaction path is shortened in the reduced mechanism,and the reaction rate is accelerated.The simulation ignition delay is shorter than the experimental results.The reduced mechanism can better predict the ignition delay of PRF and partial component concentration after the correction of the reaction rate coefficient of the total packing reactions,indicating that the final New-PRF reduced mechanism is effective.