A Study About Diesel Engine Flow And Combustion Process Influenced By Combustion Room Partiality Rate

The decrease of the energy and the pollution of the environment have been the two serious problems in the world. It has become a highlight to researching the operation process especially combustion process for IC-engine. The method of numerical simulation can effectively forecast the complete performance of IC-engines and partly replace some engine experiment, and carry on various parameter researches in different operational modes without the time and space limit, guide the designs of engines with the new combustion system, optimize the performance of original engines. It can also forecast the power and exhaust emissions of the engine fired with various fuels. Therefore the method of numerical simulation has very powerful vitality and many advantages.KIVA-3V, a multidimensional simulation program developed by U.S. Los Alamos National Laboratory, is introduced in this thesis. With the softwares of Fieldview and MATLAB, the calculated results are visualized to draw animating contour plots and average performance charts. Based on KIVA-3V, the operation process in cylinder of a type 486 diesel engine modified is simulated, the detail information of the flow field in cylinder and average performance graphic charts are obtained and compared with the experimental data. On this foundation, this text calculated a few different partiality rates combustion chamber, and detailed elaborated the different partiality rate condition next inside flow the field, pressure, temperature, exhaust of distribute the circumstance and influences.