辐射热作用下金属钠燃烧现象试验研究

Experimental study on the combustion characteristic of sodium metal under heat radiation

在辐射热通量为25~60 kW/m^2条件下对利用锥形量热仪对金属钠的燃烧现象进行了研究,测量了燃烧尾气中的氧气含量与剩余物料的质量。结果表明:随着环境热通量增加,金属钠燃烧现象存在较大差异性,残留物数量逐渐减少至完全参与燃烧。当辐射热通量小于30 kW/m^2时,金属钠未出现明火燃烧;在外界辐射热通量为50~60 kW/m^2时,金属钠发生较不稳定、不充分的明火燃烧;当辐射热通量大于60 kW/m^2时,金属钠发生较为稳定且全面的明火燃烧。

Research on the combustion characteristics of sodium metal was conducted on cone calorimeter with various surrounding radiation heat flux from 25 kW/m^2 to 60 kW/m^2, and the oxygen content in combustion gas and residual mass were measured. The result showed that: with the surrounding radiation heat flux increasing, there were big differences in the combustion phenomena of sodium metal, and the residual mass decrease, until the complete combustion happened. An ambient radiation heat flux smaller than30 kW/m^2 is unable to trigger a flame burning for Sodium metal.When the radiation heat flux is 50~60 kW/m^2, the unstable and inadequate open fire happened. When the radiation heat flux is bigger than 60 kW/m^2, stable and fully open fire happened.