气缸盖鼻梁区水腔结构及两相流动参数对沸腾传热影响研究  

Study on Effect of Cylinder Head Bridge Zone Structure and Two-Phase Flow Parameters on Boiling Heat Transfer

作　　者：何联格[1] 左正兴[1] 向建华[1] 

机构地区：[1]北京理工大学机械与车辆学院,北京100081

出　　处：《内燃机工程》2014年第3期62-68,共7页Chinese Internal Combustion Engine Engineering

基　　金：国家重点基础研究发展计划资助项目(1030021210710)

摘　　要：针对高强化柴油机气缸盖鼻梁区严重的热负荷问题,将鼻梁区结构简化为一个矩形加V形截面形状,建立了参数化模型。采用气液两相流沸腾传热计算模型,对其简化模型进行了流固耦合传热仿真计算。在此基础上,采用试验设计方法,研究了冷却水进口速度、温度和沸腾时所产生的气泡尺寸等两相流动参数及在矩形尺寸不变的条件下,V形高度和下部宽度的变化对鼻梁区最高温度的影响。研究结果表明:鼻梁区最高温度随冷却水进口速度、气泡尺寸、V形高度及下部宽度的增大而降低,随冷却水进口温度的升高而升高;V形高度方向的变化对沸腾传热产生的影响比下部宽度方向的变化更明显,冷却水进口速度的变化对沸腾传热产生的影响比进口温度的变化更明显。For research on heat load in heavy duty diesel engine cylinder head bridge zone, the bridge zone structure was simplified as rectangle ＋ V-shape to establish the parametric model. By using gas-liquid two-phase flow boiling heat transfer model,the fluid-solid coupling heat transfer system was simulated. On the basis,effects of cooling water inlet velocity and temperature, boiling bubble size and V-shape height and lower width on bridge zone highest temperature were examined by using the experimental design method. Results show that the bridge zone highest temperature decreases with cooling water inlet velocity, bubble size, V-shape height and lower width increasing, and increases with cooling water inlet temperature increasing; effect of V-shape height change on boiling heat transfer is greater than that of change in lower width;effect of cooling water inlet velocity change on boiling heat transfer is more obvious than that of inlet temperature.

关 键 词：内燃机 气缸盖鼻梁区 冷却水腔 沸腾传热 气液两相流 流固耦合传热 

分 类 号：TK422.4[动力工程及工程热物理—动力机械及工程]