Numeric Simulation Based On KIVA-3V On Air Intake In Four Cylinder Vehicle With The Diesel Engine

The air intake system is the important constituent of engine. The air intake system quality could decide the engine performance directly. The air intake has the important influence to the internal combustion engine of each performance index. With the development of economy and society , lots of countries' environmental protection consciousness have a great enhancement. In order to reduce the air pollution, the engine emissions performance has gained more and more attentions. Then whether or not the design of intake part is reasonable effects directly the size of fresh air taken in the cylinder.Then the engine the efficiency, the power and the emissions performance could be influenced.Therefore, it is necessary to conduct the research on the flow of gas taken in the intake part of the engine.At present, the researches on the flow of gas taken in the intake part of the engine in our country mainly depend on experiments. Carrying on massive experiments on the laboratory bench costs too much time and energy.And the experimental methods seems to be obsolete,which cannot meet the need of modern high performance engine development work. Although the Numerical simulation also is at the phase of exploitation, some people have made the Numerical simulation on the intake part.It had proved the feasibility of obtaining the air intake discharge coefficient by using Numerical simulation.Concequently, using the multi-dimensional value simulation technology is one effective research method.This topic utilizes the KIVA-3V software,and simulated time the different tire valve opening air admission Daoist believers field distribution. Through the visualization post-processing, people obtain in the gas channel pressure distribution field and the flow of gas velocity distribution field and so on the mass data information, get time various rotational speeds mass flow and the mean velocity of stream,and gain time the different rotational speed discharge coefficient through the computation.Then you can carry on the comparative analysis with the experiment discharge coefficient to obtain the discharge coefficient and the mean velocity of stream along with the engine speed change rule.Thus provides the reliable theory basis for the design and the improvement air intake,.It can also guide the the development of new engines and enhance the old engines' performance .As a result ,you can reduce the experimental expense. It has a vital significance to shorten the run time and save the massive manpower as well as physical resources.