内燃机缸盖水腔内过冷沸腾数值模型研究  

Research of Subcooled Boiling Numerical Models in Cylinder-Head Water-Jacket of Internal Combustion Engines

作　　者：李智[1] 黄荣华[1] 程晓军[1] 李威[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,湖北武汉430074

出　　处：《内燃机学报》2010年第3期247-252,共6页Transactions of Csice

基　　金：科技部"863"计划节能与新能源汽车重大专项资助项目(2008AA11A121)

摘　　要：比较了不同沸腾传热计算关联式用于矩形截面管道水平流动沸腾状况下的计算精度,并以计算精度较高的BDL模型为基础,选择合适的方法建立了蒸汽泡生成率与壁面沸腾传热的联系。然后基于欧拉均相模型框架,并结合描述各种沸腾现象的子模型,建立了新的可用于内燃机缸盖水腔内过冷沸腾数值模拟的两相流模型。最后以实际发动机缸盖水腔为研究对象,进行了沸腾传热与气液两相流的计算,并分析了沸腾因素对缸盖冷却效果的影响及缸盖水腔中的气泡堵塞状况。Calculation accuracy of different boiling heat transfer correlations is compared, which is implemented in a rectangle cross-section pipe for horizontal subeooled boiling flow. The relationship between steam bubble generation rate and wall boiling heat transfer is established based on high accuracy BDL model. Based on the framework of Euler mixture model combined with submodels for various boiling phenomenon, a two-phase flow model to simulate the subcooled boiling flow in IC engine cylinder-head is proposed. Production engine cylinder-head water-jacket is chosen for studying. Calculation of boiling heat transfer and vapor-liquid two-phase flow are implemented. Analysis on impact of boiling factor on cooling of cylinder head and bubble congestion condition is conducted.

关 键 词：缸盖水腔 沸腾传热 气液两相流 模型 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]