入腔法校准辐射热流计入腔位置的确定

Determination of the Location for Heat Flux Sensor Inside the Cavity Using In-cavity Calibration Method

介绍了辐射热流计的校准方法,并详细说明了入腔法校准辐射热流计的装置和原理。校准是在黑体腔直径50 mm的钠管炉和高温黑体辐射源上进行的。所采用的热流计为水冷圆箔式热流计。建立了等效腔体模型用以计算有效发射率。理论计算和试验结果均表明入腔最佳位置在热流计距黑体腔底面1倍黑体腔直径处。

This paper introduces the methods of heat flux sensor calibration and gives detailed descriptions of in-cavity calibration instruments and principles. The calibration has been performed using a sodium heat pipe blackbody and a high temperature blackbody, both with 50- mm-diam cavities. Heat flux sensors used here are circular foil type and water-cooled. An equivalent cavity model has been established to calculate the effective emissivity. The computations and experimental results show that the optimum location for the sensor is at a distance of about one cavity diameter from the cavity bottom.