气固射流扩散火焰形态研究

This study investigates the flame geometrical features of the gas-solid jet diffusion flame (GSJDF). A new facility is designed and built using the Venturi effect, by which the jet diffusion flame can entrain the micron-sized solid particles at constantrate. The uniform white quartz sands of 147 μm and 178 μm in diameters were used for test, respectively. In particular, the gas jet diffusion flame (gas jet fire) formed by closing the side sand inlet is compared with it. Theoretical analysis and experimental result make sense that the addition of sand reduces the flame temperature, and then increases the flame height and the lift-off height by increasing the flame Froude number and decreasing the flame burning speed, respectively. The GSJDF of 147 μm sand has a higher flame height and lift-off height than that of 178 μm sand, for the total mass of 147 μm sand entrained into the flame is larger and so leads to a less flame temperature. In addition, the GSJDF holds a larger trend to produce the lift-off phenomena and a higher flame height than the jet diffusion flame, which also indicates the role of sand in the flame temperature reduction.