Numerial Simulation Of Fuel Reformed Diesel Working Process Based On Chemical Reaction Mechanism

The air pollution already become a problem of the world, it destroy the ecosystem and the condition of human survival and development normally. The engine is one of main sources of it. It can study the production mechanism of emissions with the simulation software, analyzes the emissions with different engine conditions, provide the theory basis to reduce the engine emissions. The software of CFD is the effective tool of the heat transfer, the mass transfer, the momentum transfer and the combustion, the polyphase flow and the chemical reaction research, and FLUENT is one of the software which has most comprehensive function and wide application.Simulates fuel reformed of ZS195 diesel, analyzes the distribution of in cylinder flow field, turbulent kinetic energy, temperature, oxygen, diesel oil, NOX, soot, average pressure and average temperature. The result shows that the NOX emission increases and the soot emission reduces after mixing CO. Simulation value is close to experimental value. The NOX emission and soot emission reduce simultaneously after mixing H2, CO and EGR. The large-scale computation needs to cost many time with the serial computing now.However it may enhance the computation speed of the FLUENT with the parallel computing. This article has tested the influence which each kind of parallel computing plan enhances the computation speed. The result shows that the parallel computing can not increase the computing speed obviously when amount of calculation is small. But it can when amount of calculation is big. The LINUX system is better than the WINDOWS XP system for the performance of parallel computing. The computer dominant frequency is higher, the parallel computing performance is better.