CFD Simulation Of The Coolant Flow In Engine Cylinder Block And Head

In this paper, an experimental research and the numerical simulation of the coolant flow in the cylinder head and cylinder block are performed on the cooling-water system of one vehicle engine with highly-intensified heavy-duty.From the documents about the measuring and display methods of the flow field, the calculating of the numerical simulation, the writer summarize the status quo and development trend of the cooling water flow research both in the test area and numerical simulation in domestic and overseas. Then introduce the CFD's basic theory in detail, the process, and each step's characteristic in the process. The flow field in a engine body and engine head is simulated, survey the credibility of the simulation, adopt different turbulence model to proceed simulation, demonstrate the economical and practical of the k-εmodel. According to the simulation calculation, analyze the flow field's characteristic, the uniformity of each cylinder discharge and the velocity in bridge of the nose. As the velocity in the triangular space between two inlet ports is little low, enlarging the upstream hole, the calculating results show that the flow field has little change, but the velocity in the bridge of the nose is enhanced.In this paper, the author also consider the mesh quality, mesh quantity and wall roughness'impacts for the CFD numerical simulation. From this purpose, author use the orthogonal experimental design to determine the impacts. Choosing the orthogonal table, computing according to the rule of orthogonal experimental design, doing range analysis and variance analysis. Find the mesh quality has significant impact for the CFD simulation. There is interaction between mesh quality and mesh quantity.The research shows it is creditable to analyze the flow in engine water jacket by CFD. it was precision and tempi best compromise selection while adopting mesh quantity for 2 million around, mesh quality not less than 0.2, as well as k-εmode to proceed six-cylinder the cooling water flow in six-cylinder engine block and engine head . It can satisfy the accuracy requirement in engineering.