缸盖材料温变效应的理论与试验研究  

The Theoretical and Experimental Study of Temperature Change Effect of Cylinder Head Material

作　　者：邵颖慧[1] 张宇[1] 夏琪玮[1] 黄瑞[1] 俞小莉[1] 

机构地区：[1]浙江大学动力机械及车辆工程研究所,杭州310027

出　　处：《内燃机工程》2013年第4期1-6,共6页Chinese Internal Combustion Engine Engineering

基　　金：国家重点基础研究发展计划项目(613146)

摘　　要：采用数值仿真分析手段,研究了高热流密度条件下蠕墨铸铁平板内部传热状态随物性的变化。结果表明:在常物性和变物性2种不同的假设条件下,平板稳态传热的温度场分布存在显著差异。为了验证仿真分析结果,搭建了试验测试台架,材料常物性假设条件下的数值仿真结果相对试验实测数据的误差最高可达12%,而变物性计算条件下的数值仿真结果与试验数据误差在2%以内。且在某一热流密度范围内,常物性设置的计算结果非常接近变物性设置计算结果及实测值,即在该热流密度范围内的仿真可以用适当温度下的常物性设置来代替变物性设置,以简化计算。在此基础上,针对某机型缸盖结构设计方案,分别计算了常物性和变物性条件下缸盖火力面的温度分布。结果与平板仿真结果吻合,常物性与变物性之间的误差最高为7.03%。In a engine cylinder head made of vermicular cast iron, influence of different thermal property settings on its heat transfer was studied. In numerical simulation analysis, significant different cylinder head temperature field distributions were found in the constant and the variable property settings. Validated by special bench test, in the same condition simulation error of constant property setting can be as much as 12% compared to actual experiment, and for variable property setting it can be controlled within 2 %. Additionally,the result of constant property setting would be very approximate to the result of variable property setting and the real experimental data in certain regions of heat flux. So in these heat flux conditions,the constant property sitting may be used instead of the variable property setting to simplify calculation. On this basis, numerical simulation was executed on a cylinder head design scheme and its temperature field was obtained in the constant and the variable property settings. As shown in the result, the conclusion is similar with the simulation in the 3-D pan head model. The max. error between constant and variable property setting simulations is 7.03 %.

关 键 词：内燃机 高热流密度 蠕墨铸铁 变物性 缸盖传热分析 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]