The Thermal Properties of Insulation Defecs in Pressure Vessels and Infrared Detection
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摘要: 建立压力容器保温层缺陷的热特性分析模型，通过数值模拟红外检测对保温层缺陷热特性的影响因素进行研究，分析了环境因素、热激励强度、热激励时间对其影响。结果表明：辐射温度低于300 ℃，增加热激励会降低表面最大对比温度，而高于300 ℃后，增加热激励会增大对比温度。激励时间增加，最大对比温度趋势为先升后降，在稳定状态时其对比温度最小。风速、表面黑度对热特性影响较大，环境温度影响则较小。Abstract: The temperature distribution model of thermal insulated pressure vessel was established. The effect of the environmental factors, thermal incentive intensity and were studied thermal incentive time to the test was analyzed. The influencing factors about detection of pressure vessel defects by using computational fluid dynamics software Fluent and infrared detection experiments. The results showed that: When the radiation temperature is below 300 ℃, increasing the thermal excitation will reduce the maximum contrast temperature. Whereas when it is higher than 300 ℃, increasing the thermal excitation will increase the maximum contrast temperature. With the thermal incentive time increasing, the trend of maximum contrast temperature rises first and falls later and the minimum contrast temperature appears in stable state. The influence of wind speed and surface blackness in environmental factors for the accuracy of testing experiment is severer. The influence of the environmental temperature can be ignored.
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