工业喷嘴雾化冷却特性测试方法

基于非稳态导热原理，设计并开发了一套喷嘴喷雾冷却特性测试实验装置。将Q215钢种试样加热并恒定表面温度，然后通过对表面进行喷雾强制冷却，连续采集并保存冷却过程中试件不同测点的温度变化。通过Matlab与VC6.0接口编程，离线拟合密度、比热容及导热系数等热物性参数与温度拟合方程以及不同测点温度与时间的拟合方程。结合测试的拟合方程，对非稳态导热方程进行离散处理间接测量表面的传热系数，进而评价喷嘴冷却特性。通过系列现场测试实验，测试喷雾冷却过程中表面温度，水流密度及喷水压力等条件下表面的传热系数，实验结果真实反映了喷雾冷却条件下喷嘴的冷却特性，并表明该方法可行，能实现喷嘴冷却特性测试及喷嘴性能评价。

Measurement method for spray cooling characteristics of industrial nozzle

In order to study the cooling characteristics of the nozzle, a test platform is designed and developed for spray cooling feature measurement based on unsteady state heat conduction. By heating and keeping Q215 metal samples up to some surface temperature, a series of temperature data are collected by S7-200 modules during spray force cooling. Through Visual C++6.0 and Matlab interface programming, a series of regression equation with thermodynamic property versus temperature, such as density, specific heat capacity, and thermal conductivity etc., and with temperature versus sample time are obtained. The surface heat transfer coefficient and spray cooling feature of nozzle can be indirectly measured by the regression equations. The relation between surface heat transfer coefficient versus temperature, spray pressure and water intensity are investigated by means of the testing equipment. The experiment result shows the method is feasible and can be used in spray cooling feature measurement for all kinds of nozzle.