充装条件对超细干粉灭火剂水平直管内喷放流量的影响

发布时间：2018-08-16 11:22

【摘要】：为研究不同充装条件下超细干粉灭火剂在水平直管内的气固两相流动特性,搭建超细干粉灭火剂水平直管喷放试验台,改变充装比和起始充装压力,测量管内的沿程压力分布,比较喷放流量和气固比的变化,重点分析了超细干粉灭火剂在水平管内的释放过程、沿程压降和充装比临界值。结果表明,超细干粉灭火剂的释放过程有喷放前期、平稳喷放和喷放后期3个阶段,其中平稳喷放阶段是灭火剂有效作用时间。沿程压降几乎不受灭火剂充装比的影响,但随起始充装压力增大而增大。此外,喷放流量曲线上的临界转捩曲线与气固比计算值曲线上转捩曲线相吻合,起始充装压力为2.5 MPa、4.2 MPa和10 MPa时,喷放流量曲线对应的充装比临界值分别为0.412 kg/L、0.439 kg/L和0.458 kg/L。充装比小于临界充装比时,喷放流量随充装比增大而减小;充装比大于临界充装比时,喷放流量变化不大。而且临界充装比随充装压力单调递增。
[Abstract]:In order to study the gas-solid two-phase flow characteristics of superfine dry powder extinguishing agent in horizontal straight pipe under different filling conditions, a test bed for horizontal direct pipe injection of ultra-fine dry powder extinguishing agent was built, and the pressure distribution along the pipe was measured by changing the filling ratio and initial filling pressure. The release process of superfine dry powder fire extinguishing agent in horizontal pipe, the critical value of pressure drop and filling ratio along the horizontal pipe are analyzed by comparing the change of jet discharge flow rate and gas-solid ratio. The results show that the release process of ultrafine dry powder extinguishing agent includes three stages, I. e., the pre-spray stage, the stable spray stage and the later stage, in which the effective action time of the extinguishing agent is stable. The pressure drop along the range is almost independent of the charge ratio of the extinguishing agent, but increases with the increase of the initial filling pressure. In addition, the critical transition curve on the jet discharge flow curve coincides with the transition curve on the gas-solid ratio calculation curve. When the initial filling pressure is 2.5 MPA ~ (2. 2) MPa and 10 MPa, the critical filling ratio corresponding to the injection / discharge flow curve is 0.412 kgL / L 0.439 kg/L and 0.458 kgL / r, respectively. When the filling ratio is less than the critical filling ratio, the ejection flow rate decreases with the increase of the filling ratio, and when the filling ratio is larger than the critical filling ratio, the jet discharge rate does not change much. And the critical filling ratio increases monotonously with the filling pressure.
【作者单位】：南京理工大学化工学院;上海飞机设计研究院;
【基金】：教育部高等学校博士学科点专项科研基金项目(20123219120017)
【分类号】：X932

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