Optimization Design for Water Jacket of 4G24 Gasoline Engine

Abstract

Use CFD (Computational Fluid Dynamics) technique to simulate the water jacket of 4G24 gasoline engine is an effective way to look into the internal flow status of the water jacket. After calculation analysis, it is found that part of regional flow rate is too low in the cylinder head and block water jacket, where is easy to form dead areas. The HTC (Heat Transfer Coefficient) on cylinder block intake side is low, and needs to be improved. Total pressure loss of water jacket surface is too large. Based on above calculation analysis, as optimized schemes, place a baffle at the inlet in front of the cylinder, add some holes on the top of cylinder block by use of clear sands holes to guide water from cylinder block to cylinder head and form better water flow lines. After optimization, dead areas were eliminated, heat transfer effect of cylinder block intake side is improved. Total pressure loss of water jacket surface is basically unchanged or slightly increased. By comparing some optimized schemes, place a baffle at inlet is found to be the best one.