摩托车发动机冷却水套流场特性及结构改进

Flow Field Characteristics and Structure Improvement of Motorcycle Engine Cooling Water Jacket

选取CFD流体分析软件STAR-CCM+对摩托车发动机冷却水套进行流场数值模拟及结构改进研究。结果表明,水套原方案缸孔布局不合理,导致冷却水套冷却液流动均匀性较差,排气侧及火花塞侧高温区域冷却较差,不利于高温区域冷却。在水套原方案上减小进气侧缸孔流通面积后,排气侧及火花塞侧冷却液流速明显提升,冷却液利用率提高,保证了高温区域的有效冷却。实验测试结果显示冷却水套结构改进后发动机的缸温降低8℃,表明冷却水套改进结构有效,冷却性能提升明显。研究方法及结果可为摩托车发动机冷却水套的结构设计提供理论参考。

The CFD fluid analysis software STAR-CCM+is chosen to conduct the flow field analysis and structural improvement of motorcycle engine cooling jacket.Results show that the unreasonable layout of cylinder holes in the original scheme of water jacket leads to poor flow uniformity,poor cooling in the high temperature area at the exhaust side and the spark plug side,which is not conducive to the cooling of high temperature area.After reducing the flow area of cylinder hole on the intake side in the original water jacket scheme,the flow velocity of coolant on the exhaust side and the spark plug side was significantly increased,and the utilization rate of the coolant was improved,which ensured the effective cooling of high temperature area.The experimental results show that cylinder temperature of the engine with the improved cooling water jacket structure decreased by 8 degrees,which indicates that the improved cooling water jacket structure is effective and the cooling performance is significantly improved.The research method and results can provide theoretical reference for the structural design of motorcycle engine cooling water jacket.