摘要
针对内燃机缸盖鼻梁区严重的热负荷问题,以一款高强化增压水冷式柴油机为研究对象,借助内窥式高速摄像技术,搭建了缸盖水腔内鼻梁区沸腾换热试验系统.在不同柴油机运行工况下分别获得了不同进口过冷度及进口流速下沸腾气泡演化行为图像.图像分析结果表明:在标定工况下,随着冷却液过冷度的下降,沸腾气泡数量增多,尺寸增长加快,气泡滑移速度增加;在最大转矩工况下,沸腾气泡当量直径比低速大负荷工况时增大20%,左右,气泡滑移速度比低速大负荷工况时提高近2倍.
Thermal load in the bridge zone of cylinder head is generally a serious issue in internal combustion engines.Based on a water-cooled diesel engine with high turbocharging boost ratio,an experiment of boiling heat transfer in the bridge zone of cylinder head was conducted by means of endoscopic high-speed photography technology.Under different operating conditions of the diesel engine,the evolution behaviour of boiling bubbles at different subcoolings and inlet velocities was obtained.The results of image analysis show that there is a significant increase in bubble numbers,bubble sizes and bubble slip velocity with the decrease of coolant subcooling under the rated power condition.The bubble equivalent diameter under the maximum torque condition is about 20% larger than that under low-speed and high-load operations.The bubble slip velocity is nearly 2 times higher than that under lowspeed and high-load operations.
作者
董非
张朝烛
龚伟
蒋亮
侯刘闻迪
胥振龙
Dong Fei;Zhang Chaozhu;Gong Wei;Jiang Liang;Hou Liuwendi;Xu Zhenlong(School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China;FAW Jiefang Wuxi Diesel Engine Factory, Wuxi 214026, China;State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China)
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2018年第3期252-257,共6页
Transactions of Csice
基金
国家自然科学基金资助项目(51406070)
江苏省"六大人才高峰"资助项目(JXQC-008)
江苏高校优势学科建设工程资助项目(PAPD)
关键词
柴油机
沸腾换热
可视化
气泡
演化行为
diesel engine
boiling heat transfer
visualization
bubble
evolution behavior
