Numerical Simulation And Optimization Of Cooling Jacket In The Gasoline Engine By CFD

With the increasingly stringent environmental regulations and non-renewable resource exhausting, the whole performance of the internal combustion engine should be improved. Many factors influence the engine's performance, high temperature impact it a lot.The cooling performance is poor, vehicles will be used in high temperature condition, the main issue is engine overheat and lubrication performance degradation, which eventually led to the economic performance and power engine performance, reliability and durability worsening. So the engine cooling system research is of great significance. And one of the main cooling system design difficulties is cooling channel calculation design, and to conduct more accurate calculation must conduct 3d complex flow simulations and numerical simulation design is the most effective tool to realize this process.This paper is also applied for engineering, studying oil and gas flow mixing process of port-fuel-injected gasoline engine as the basic research, based on the two-phase flow basic principles, start numerical simulation of gas flow, Jet fuel and oil mixing in port to cylinder process.This paper introduces the basic process of the computational fluid dynamics (CFD) and its basic principle ,that is the theoretical basis of application calculation, when applied conservation equation and discrete method; Summarizes the process of establishing calculation mesh model and parameter calculation conditions. According to the actual requirements of the engineering project of development work, combined with computational fluid dynamics software AVL, two sets of different cylinder cushion structure optimization model for grid model was constructed, and done a lot of simulation calculation.Basic research contents were water jacket with engine cooling performance by the three-dimensional flow field simulation, numerical simulation results of 3d fluid are analyzed, and based on the analysis of the structure optimization scheme was put forward, finally the simulation results are compared, and summarized ideal optimized result.This article through numerical simulation analysis, by 3d model reveals plan of internal cooling engine water fluid flow distribution; Through the optimization of the structure, control key parts of the diesel exhaust temperature (such as the base and injector door between "bridge of the nose" area), get relatively uniform temperature distribution and reduce power loss and heat, so as to improve the reliability of the components and engine performance. And provide reference and basis for the cooling water flow field optimization design.