High Temperature Oxidation Of Gasoline Primary Reference Fuel And Its Kinetic Mechanism Reduction

As one of the most important alternative solution for the internal combustionengine technology whose development is shaped by demands for higher engineefficiency, lower emissions and competitive cost, the practical application ofpremixed compression ignition faces challenges from narrow operational region,transient operation deterioration, parameter oversensitive and the difficulty for robustcontrol. To further investigate the essence of combustion characteristic and thegoverning factor of premixed compression ignition engine, fundamental experimentand numerical study concerning the kinetic procedure of gasoline are carried out,skeletal reduction on the detailed chemical mechanisms fuel is also performed.PRF (Primary reference fuel) is selected as the surrogate for commercial gasolineand its low pressure laminar burner stabilized flame is detected to validate thecalculation result of three detailed mechanisms. Mole fraction profiles and rates ofproduction (ROP) of5final products,6olefins,6alkynes (diolefin) predicted by thedetailed mechanisms are compared with the experimental results. The mechanisms arevalidated to keep good track of experimental profiles for final products while moredeviation are observed when olefins and alkynes are concerned. The reason of suchdeviation is analyzed through ROP study and corresponding revision on themechanisms promote the accuracy of their predictions.Skeletal reduction is then performed on the two of the detailed mechanisms basedon the methods of DRG and DRGEP with CO and H radical being chosen as thebinding species. Such choice of binding species is found to be more representative forthe overall procedure of oxidation compared with fuel molecules. The reductionprovides four series of skeletal mechanisms and a prototype is chosen for each of theseries. The prediction of the skeletal mechanisms agrees well with the originaldetailed mechanism on the basis of about90%size reduction and nearly100timesincrease on the computation efficiency. The reduction on size makes the skeletalmechanisms more suitable for further time scale analysis.