气雾射流冷却热圆筒的传热研究  

Heat Transfer of Hot Cylinder During Aerosol Jet Cooling

作　　者：魏万洪 赵增武 张亚竹[1] 韩毅[1,2] 高泽楠 

机构地区：[1]内蒙古科技大学能源与环境学院,内蒙古包头014010 [2]内蒙古科技大学内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室,内蒙古包头014010

出　　处：《铸造技术》2018年第1期107-110,共4页Foundry Technology

基　　金：国家自然基金资助项目(51264030);内蒙古自然科学基金资助项目(2013MS0723)

摘　　要：在自制周期性换热的实验平台上,利用加热圆筒实现动态周期性换热,测得其高温圆筒表面的温度与热流密度。采用布置在圆筒内部热电偶测得其近壁面温度,利用二维非稳态导热反问题计算方法实现表面温度和热流密度的测量。圆筒以其轴心,水平旋转,转速为0、5、10、15 r/min,初始温度为1 150℃。实验结果表明:缸筒静止时,冲击区的临界热流密度为3.33 MW/m^2,是漫流区临界热流密度的两倍。缸筒周期性换热时,临界热流密度最大值出现在射流的"上游区";对于缸筒在不同的转速,随着转速的增加临界热流密度(CHF)逐渐减小,从1.73 MW/m^2减小到1.23 MW/m^2。A cylinder experimental platform was used to measure the temperature and heat flux of hot cylinder surface. Thermocouples inside cylinder were used to measure near-wall temperature. A two-dimensional unsteady heat conduction calculation of inverse problem solution was used to estimate cylinder surface temperature and heat flux from measured temperature. The hot cylinder horizontally rotates and initial temperature is 1 150℃. The experamental results show that, When the cylinder is stationary, the critical heat flux （CHF） in impinging zone is 3.33 MW/m^2, it is two times in overflow zone. In the case of a rotating cylinder, the maximum of heat flux is not in the jet centerline but in the ＂upstream zone＂. The critical heat flux decreases with the increase of rotating speed, from 1.73 MW/m^2 to 1.23 MW/m^2.

关 键 词：气雾射流 传热反问题 静止表面 周期性换热 

分 类 号：TK124[动力工程及工程热物理—工程热物理] TG249[动力工程及工程热物理—热能工程]