The Analysis And Simulation Research Of The Water Jacket Flow Field Of The Engine

With the continual development of science and technology,the methods of design in the engines and their component have significant transformed,and follows the enhanced design quality the performance of the engine also obtain unceasing enhancement. The affection of the coolant flow in engine's cooling system focus on the cooling effective,heat load of the parts,the distribution and usage of heat energy. Meanwhile,the emissions of the engine are closely related to the coolant temperature. With the approaches to increase output power used perfectly improving cooling system have become the important tasks to design the original engines. Now,the numerical simulation of the flow and heat transfer in the engine water jacket becomes a principal method to optimum cooling system.This article has taken a section of Beijingα1.6 four cylinder gasoline engine water jacket flow field as the object for studying. Using the three-dimensional CAD software UG to establish the cylinder water jacket flow field geometry model, and has taken the essential simplification as far as the possible in the guarantee with the original water cavity consistent. The model is checked and meshed by the FLUENT front-processed GAMBIT, subsequently, the water jacket flow field are computed and displayed,and then the results are post-processed and analyzed all by FLUENT.By the simulation calculation of the flow field in water jacket of the four cylinder gasoline engine,the results show that the design is comparatively to be reasonable and can achieve the cooling effect. But it also has some deficiencies, mainly displays the speed of cooling liquid is not too large in the cylinder head water jacket,the distribute of the temperature is not uniformed, and they still had further to make the improvement. Therefore, this article use three improved programme and do the simulation calculation to the improved flow field of the water jacket. The results show that the speed of cooling liquid is increased largely in the cylinder head water jacket, and the distribute of the temperature is more uniformed.Through the three-dimensional CFD numerical simulation of the cylinder water jacket in gasoline engine,we have got the massive flow field information and have offered certain theoretical foundation for development and improvement of the series gasoline engine cylinder.