单色高温计测量火焰动态温度的可行性实验研究

Experimental Study on the Feasibility of Dynamic Temperature Measurement Using a Single Wavelength Pyrometer

一种测量固体表面温度的单色高温计经改进后,用于火焰动态温度测量,本文设计了三组实验对其可行性进行研究,即:黑火药与铝热剂的分层火焰温度测量实验、单色高温计与热电偶的测温对比实验和激波管内氢氧爆炸火焰动态温度测量实验。结果表明,当目标尺寸远大于单色高温计红外视场时,所测火焰温度可视为单色高温计光轴上的最高温度;采用单色高温计和热电偶同时测量发光火焰的温度,测量结果相差不到6.2%;单色高温计所测氢氧爆炸火焰的动态温度曲线,较好地反映了爆炸火焰的动态传播规律;经改进的单色高温计可以用于爆炸火球等发光火焰的动态温度测量。

A type of single wavelength pyrometer used for temperature measurement of solid surface was improved and employed to measure the dynamic temperatures of flames. Three experiments were designed to check the feasibility of the pyrometer in this paper, namely the temperature measurement of layered flames of the black powder and the thermit, the comparison experiments of the single wavelength pyrometer and the thermocouple, and the dynamic temperature measurement of hydrogen- oxygen explosion in the shock tube. The results indicated that the measured temperature could be regarded as the highest temperature on the ray axis of the pyrometer when the size of the target was much larger than the field of view of the pyrometer; the measured values of the lighting flame by pyrometer and thermocouple were close, and the measurement error was less than 6.2 % ; the dynamic temperature curves of hydrogen-oxygen explosion measured by the pyrometer accord with the propagation laws of explosive flame well. It can be concluded that the improved single wavelength pyrometer can be used to measure the lighting flame＇s dynamic temperature.