The present study aims to clarify the effects of turbulence intensity and coal concentration on the spherical turbulent flame propagation of a pulverized coal particle cloud. A unique experimental apparatus was developed in which coal particles can be dispersed homogeneously in a turbulent flow field generated by two fans. Experiments on spherical turbulent flame propagation of pulverized coal particle clouds in a constant volume spherical chamber in various turbulence intensities and coal concentrations were conducted. A common bituminous coal was used in the present study. The flame propagation velocity was obtained from an analysis of flame propagation images taken using a high-speed camera. It was found that the flame propagation velocity increased with increasing flame radius. The flame propagation velocity increases as the turbulence intensity increases. Similar trends were observed in spherical flames using gaseous fuel. The coal concentration has a weak effect on the flame propagation velocity, which is unique to pulverized coal combustions in a turbulent field. These are the first reports of experimental results for the spherical turbulent flame propagation behavior of pulverized coal particle clouds. The results obtained in the present study are obviously different from those of previous pulverized coal combustion studies and any other results of gaseous fuel combustion research.

本研究旨在阐明湍流强度和煤浓度对煤粉云的球形湍流火焰传播的影响。开发了一种独特的实验设备，其中煤颗粒可以均匀地分散在两个风扇产生的湍流场中。在不同的湍流强度和煤浓度条件下，进行了粉煤颗粒云在恒定体积球室内的球形湍流火焰传播实验。本研究中使用了普通的烟煤。火焰传播速度是通过对使用高速相机拍摄的火焰传播图像进行分析而获得的。发现火焰传播速度随着火焰半径的增加而增加。火焰传播速度随着湍流强度的增加而增加。在使用气体燃料的球形火焰中也观察到了类似的趋势。煤浓度对火焰传播速度的影响微弱，这是在湍流场中粉煤燃烧所独有的。这些是粉煤颗粒云的球形湍流火焰传播行为的实验结果的第一份报告。在本研究中获得的结果与以前的煤粉燃烧研究以及气态燃料燃烧研究的任何其他结果明显不同。这些是粉煤颗粒云的球形湍流火焰传播行为的实验结果的第一份报告。在本研究中获得的结果与以前的粉煤燃烧研究以及气态燃料燃烧研究的任何其他结果明显不同。这些是粉煤颗粒云的球形湍流火焰传播行为的实验结果的第一份报告。在本研究中获得的结果与以前的粉煤燃烧研究以及气态燃料燃烧研究的任何其他结果明显不同。