摘要:
为研究水平管道空间煤尘爆炸火焰传播特性，以水平玻璃管道煤尘爆炸实验装置为依托，以褐煤为研究对象，构建了煤尘爆炸火焰传播特性数学模型和水平管道几何模型，采用数值模拟方法研究了水平管道空间煤尘爆炸不同时刻沿水平管道长度方向（z方向）火焰传播特性、爆炸反应充分时沿z方向火焰温度传播特性及不同截面火焰温度传播特性。研究结果表明：① 不同时刻爆炸火焰传播距离模拟值与实测值最大误差为0.09 m，最小误差为0.01 m，验证了数值模拟方法的可行性。② 煤尘爆炸反应充分时，水平管道空间可划分为初始扬尘区z=0～0.1 m、高温点火区z=0.1～0.3 m、温度跃升区z=0.3～0.56 m、高温核心区z=0.56～0.86 m和高温扩散区z=0.86～1.4 m。③ 煤尘爆炸反应充分时，z=0.2 m处截面上，距圆心越近则温度越低，说明该区域虽为爆源，但不是爆炸热量释放核心区；z=0.2，0.4 m处截面最外围近壁区域存在约500 K窄环形低温区，这是由于管壁设置温度恒为常温300 K所致；z=0.86~1.4 m处截面上，距圆心越近则温度越高，截面距高温核心区越远则温度越低。数值模拟结果与火焰实际传播情况相符。
Abstract:
In order to research flame propagation characteristics of coal-dust explosion in horizontal pipeline space, based on coal-dust explosion experimental equipment with horizontal glass pipeline, mathematical models of flame propagation characteristics of coal-dust explosion and geometry model of horizontal pipeline were constructed taking lignite as research object, and numerical simulation method was used to research flame propagation characteristics of coal-dust explosion along pipeline length direction (z direction) in horizontal pipeline space at different time and flame temperature propagation characteristics along z direction and in different cross-sections when explosion reaction was sufficient. The research results show: ① The maximum error between simulated value of explosion flame propagation distance and the measured one is 0.09 m at different time, and the minimum error is 0.01 m, which verifies feasibility of the numerical simulation method. ② When coal-dust explosion reaction is sufficient, the horizontal pipeline space can be divided into initial dusting zone of z=0-0.1 m, high temperature ignition zone of z=0.1-0.3 m, temperature jump zone of z=0.3-0.56 m, high temperature core zone of z=0.56-0.86 m and high temperature diffusion zone of z=0.86-1.4 m. ③When coal-dust explosion reaction is sufficient, in cross-section at z=0.2 m, the closer the location is to circle center, the lower the temperature at the location is, which indicates that the region is explosion source, but it is not core area of explosive heat release. There are narrow annular low temperature zones of about 500 K in the outermost peripheral wall region of cross-sections at z=0.2 m and z=0.4 m, which are due to constant pipeline wall temperature of 300 K.In cross-section at z=0.86-1.4 m, the closer the location is to circle center, the higher the temperature at the location is, and the farther the cross-section is away from high temperature core zone, the lower temperature is. The numerical simulation results are consistent with actual flame propagation.
百度学术
下载:
