火焰撞击障碍物形成的溢流火焰融合行为研究

Experimental study on flame merging behavior of spilled flame generated by flame impinging on obstruction

为深入了解核电厂横向多层电缆桥电缆火灾,针对横向多层电缆火焰撞击障碍物形成的溢流火焰融合现象开展试验研究。试验分别在10、14、28、42、56和84 kW等不同火焰热释放速率(HRR)和0.1、0.2、0.3、0.4和0.5 m等不同挡板-燃烧器距离条件下进行。对比分析不同工况下的火焰间歇概率图,引入火焰融合概率来描述火焰融合现象,发现火焰的融合行为可由火焰HRR和挡板-燃烧器距离的比值来量化区分。当比值小于200时,溢流火火焰完全不融合,为不融合区;当比值大于600时,溢流火火焰完全融合,为完全融合区;当比值大于200小于600时,溢流火火焰间歇融合,为间歇融合区。

In order to further study cable fire of multi-layer horizontal cable tray in nuclear power plants,a series of tests for spilled flame merging caused by flame impinging on obstruction were carried out.Experiments were conducted for HRR at 10,14,28,42,56 and 84 k W and distance between plate and burner at 0.1,0.2,0.3,0.4 and 0.5 m.Then,figure of flame intermittence probability under different conditions were compared and analyzed,and flame merging probability was introduced to describe merging phenomenon.It was found that such behavior can be quantitatively divided according to ratio of HRR to distance between plate and burner.When the ratio is less than 200,it is a non-merging zone as spilled flame does not merge.As the ratio is larger than 600,it will merge constantly,thus a constant-merging zone while between 200 and 600,it merges intermittently,therefore an intermittent-merging zone.