Numerical Simulation Study On Intake Port Of C14D Engine

In the gasoline engine, the intake port is one of the key factors which determine flow coefficient and the formation of the mixture gas and the process of the combustion. The entering air volume and the produced flow state is the main factors for the dynamic of the engine and economy and emission performance.The traditional design of the intake adopt the experiential design and the repeating experiments on the stablized experiment table.There are bigger blindness and limitations in the designation and long design cycle and the large expense and difficult to get ideal scheme.Based on three-dimensional numerical simulation of the gas flow in the intake,can obtain flow coefficient and the spatial distribution of the parameters such as the air pressure and flow velocity in the intake and establish the relationship between the shape and location of the intake and the rule and characteristics including flow coefficient of the gas,it has provided the basis for the design and improvement of the intake and exhaust of automobile engine.The mainly work of this study:1. Reviews the development of engine method, the fluid intake by laws of physics, mathematics model and finite element related theory2. Using the three-dimensional modelling software UG to establish solid model.3. Using FIRE to establish the grid of the calculation domain for the intake-valve - cylinder.4. Using FIRE to start the three-dimensional simulation to get the result of three-dimensional simulation for the flow coefficient and the velocity field of the air flow and stress field and the rolling trail chart5. Comparing different turbulence model of simulated result influence.6. On the basis of the original model, increasing tangential component to the inlet which is about adding in straight inlet and changing the angle of the combustion room and contrast the simulation results of these two methods of improvement.The significance of this paper:using the CFD simulation calculation of the inlet to analysis the rule about the influence of the inlet structure on the flow coefficient and combining the method of CAD/CFD to analysis the influence of the tangential inlet and the changes of angle of the combustion room on the flow field of the inlet and the rolling flow in the cylinder.