基于微积分的LPG和CNG喷射火模型建立和三维数值模拟

发布时间：2018-12-14 20:30

【摘要】：由液体和气体泄漏引发的喷射火灾事故屡见不鲜,而现有的喷射火模型却有诸多缺陷。将喷射火形状近似为圆锥,鉴于液体和气体的泄漏速度随压强和温度均有变化、点源离地面会有一定高度、风速对火焰倾角也有影响、圆锥喷射中心线上每个点源对目标的热辐射均不同等实际情况,新建液体和气体扩展半径的计算方法,引入风速对火焰高度和火焰偏角的作用,比较AGA法和Thornton模型,发现AGA法更加符合实际,再利用微积分原理建立三维点源喷射火模型,展示火焰形状对目标的影响,从而得出热辐射的最终危险性。最后以LPG和CNG储罐喷射火事故为例进行对比验证,首次模拟出喷射火的形状,更清晰准确地展示了目标入射热辐射通量随目标点位置的变化和危险范围,可为火焰阵面处的消防安全决策提供参考。
[Abstract]:Spray fire accidents caused by liquid and gas leakage are common, but the existing jet fire models have many defects. The shape of the jet fire is approximately conical. Since the leakage velocity of liquid and gas varies with the pressure and temperature, the point source will have a certain height from the ground, and the wind speed will also have an effect on the flame inclination. The thermal radiation of each point source on the center line of conical injection is different from that of the target. The calculation method of expanding radius of liquid and gas is established, and the effect of wind speed on flame height and angle of flame is introduced, and the AGA method and Thornton model are compared. It is found that the AGA method is more in line with the reality, and then the three-dimensional point source fire model is established by using the calculus principle to show the influence of the flame shape on the target, and the ultimate danger of thermal radiation is obtained. Finally, taking the fire accident of LPG and CNG tanks as an example, the shape of the jet fire is simulated for the first time, and the change of the incident heat radiation flux with the location of the target point and the dangerous range are more clearly and accurately displayed. It can provide reference for fire safety decision of flame front.
【作者单位】：西南石油大学化学化工学院;
【基金】：国家自然科学基金项目(51474187) 四川省安全监管局(四川煤监局)安全生产科技项目(scaqjgjc_stp_20150023)
【分类号】：X932

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