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基于能量守恒定律,提出一种高温、塑性变形条件下固体接触换热系数的测试方法。以此为基础,开发试制了一套不同接触条件下的固体接触换热系数的测试系统。设计了合理的实验方案,并利用该测试系统测试了H13钢与SA508-3钢在不同初始界面温差、接触载荷下的接触换热系数。研究实测结果发现,在高温下(900℃以上),接触换热系数随着接触载荷增大而增大,且呈现较好的幂律关系;初始界面温度对接触换热系数影响较小;初始界面温差对幂指数的影响较小。实测温度数据与数值模拟数据相吻合,表明该测试系统具有较好的精度与可靠性,具有工业实用价值。
Based on the law of conservation of energy, a test method for the contact heat transfer coefficient of solid under high temperature and plastic deformation was proposed. Based on this, a series of test systems for developing solid contact heat transfer coefficients under different contact conditions were developed. A reasonable experimental scheme was designed and used to test the contact heat transfer coefficient of H13 steel and SA508-3 steel at different initial interface temperature and contact load. The results show that at high temperature (above 900 ℃), the contact heat transfer coefficient increases with the increase of contact load, and shows a good power law; initial interface temperature has little effect on the contact heat transfer coefficient; initial Interface temperature difference has little effect on the power index. The measured temperature data are consistent with the numerical simulation data, indicating that the test system has good accuracy and reliability, with industrial practical value.