Simulation On The Intake System For Turbocharged Diesel Engine

Intake system of diesel engine on structure and flow characteristics directly influence power, fuel economy and emission performance of diesel engine. One key to raising power of diesel engine is improving volumetric efficiency and lower resistance to the flow of intake system in air exchange process. And, design and matching the best diesel engine intake system, we can increase the intake flow rate, improve power, improve torque characteristics and lower fuel consumption rate and soot in a certain speed. So, in theory and in practice, it is necessary to research and improve on both performance and structure of intake system.The thesis based on software GT-POWER is applied for establishing the calculation model of turbocharged diesel engine intake system. The calculation can be accord with the experiment result accurately. On the basis of model, the simulation of rated condition is conducted, and main performance is predicted. After, the intake pipe has been optimized. The parameters of intake pipe include the length of main pipe and its diameter, length and diameter of manifold and volume of steady-pressure box. From the analysis of intake parameter's effect on pressure fluctuation and volumetric efficiency, we made a conclusion and found the main affected facts. After confirming constraint and parameters, an optimization model aim to obtain maximum volumetric efficiency in rated condition is set up. The computation results indicate that the intake uniformity is satisfying.The end, it is determined that the exhaust system uses the pulse turbocharged system via matching supercharger, intercooler and turbocharged diesel engine. Based on the system, the combination operating curve variable geometry turbocharger and diesel engine is established, and external characteristics of diesel engine are analyzed. Simulation results showed that diesel engine supercharger match better. The major structural parameters of intercooler are determined aim to reduce the resistance of intercooler. This provides help for design of intercooler.