摘要
为探索发动机散热器外部气流场与内部液流流动规律及耦合传热特性,搭建了发动机冷却系统试验台并选择465Q型发动机管带式散热器进行试验研究。测定8种风扇转速下散热器正面与背面各15个测点的静压强和护风圈8个测点的总压强与静压强及风扇轴功率,经过计算获得散热器表面和护风圈出口轴向气流速度分布;在散热器进水流量q_(v)=1.8 m^(3)/h和进水温度t 1=85℃固定工况下,同步测得散热器进出口压力、水温等物理参数,同时完成散热器正面热成像拍摄;绘制出风扇变转速情况下散热器表面压强、速度分布及散热特性等变化曲线,拟合出一系列函数方程式。研究结果表明:随着风扇转速提高,散热器表面的气流量增大,气流平均速度提高,散热量呈现先增后减趋势,分析数据可得散热器气流表面平均速度与散热量近似满足1.7次方相似换算关系。
In order to explorethe flow pattern and the coupled heat transfer characteristics of external airflow field and internal fluid flow of the engine radiator,an engine cooling system test-bed was built and the 465Q engine ribbon-tubular radiator was selected for an experimental research.The axial velocity distributions on the surface of the radiator and the outlet of the wind duct were obtained by measuring andcalculating the static pressures of each 15 measuring points on the front and the back of the radiator,as well as the total pressures,the static pressuresand thefan shaft powers of 8 measuring points on the wind duct outletat 8 kinds of fan rotational speed.At the same time,the study synchronicallymeasured the physical parametersof the radiator,such aspressuresand temperatures at the inlet and the outlet,and conducted the frontal thermographyof the radiator,under the definite conditions of influent flow q_(v)=1.8 m^(3)/h and inlet water temperature t_(1)=85℃.The study then plotted curves of the surfacepressure,the velocity distribution,as well as the heat transfer characteristicsofthe radiator changing with variable fan speed,and fitted a series of function equations.The results show that with the increase of fan speed,the airflow rate and the average airflow velocity increases,the heat dissipation tends to increase at first and then decrease.The analysis data shows that the average airflow surface velocity and the heat dissipation of the radiator approximately meet the similar conversion relationship of 1.7 times.
作者
胡雅文
沙毅
倪君辉
唐涛
HU Yawen;SHA Yi;NI Junhui;TANG Tao(School of Mechanical and Energy Engineering,Zhejiang University of Science and Technology,Hangzhou 310023,Zhejiang,China;College of Intelligent Manufacturing,Taizhou University,Taizhou 318000,Zhejiang,China;Continental Temic Automotive System(Shanghai)Co.,Ltd.,Shanghai 201807,China)
出处
《浙江科技学院学报》
CAS
2021年第5期423-431,共9页
Journal of Zhejiang University of Science and Technology
基金
国家自然科学基金项目(51677171)。
关键词
汽车管带式散热器
空气场特性
变转速
热成像
automobileribbon-tubular radiator
air-field property
variable speed
thermography
