Combined flame radiation and cross-correlation method for velocity measurement of burning particles
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摘要: 针对高温燃烧颗粒运动速度在线测量难题,提出了结合火焰辐射与互相关法的燃烧颗粒速度测量方法,并设计了相应的测量装置对平面火焰炉实验系统中燃烧煤粉颗粒速度进行了测量,布置了上下游2个相距6 mm的火焰辐射光强测点,通过对该2测点辐射光强进行互相关分析计算得到燃烧颗粒运动速度,实验获得了变工况下燃烧颗粒运动速度的变化情况,同时将其与数值模拟结果对比,相对偏差不超过10%,验证了该方法可为诸如锅炉煤粉燃烧、固体火箭发动机推进剂燃烧等恶劣环境下燃烧颗粒速度测量提供一种简单、有效的测量方法。Abstract: For online velocity measurement problem of high temperature burning particles, the measurement method which combines flame radiation and cross correlation method is presen-ted,and the measurement device has been designed to measure the velocity of burning pulverized coal particles in the flat flame burner experimental system.The two upstream and downstream measuring points at a distance of 6 mm are set to obtain the flame radiation signals of burning par-ticles.The velocity is determined from the cross-correlation analysis of the two signals.Thus, the time evolution of particle velocity under different conditions is obtained.Compared to the results of computational fluid dynamic,the relative deviations have been found to be less than 10%.The result shows that this method can provide a simple and effective method for measuring the burning particle velocity in the harsh environment such as coal combustion in a boiler and pro-pellant combustion in a solid rocket motor.
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