浸机油棉布引燃及燃烧特性实验研究

Experimental study on ignition and combustion characteristics of cotton soaked with machine oil

设置明火、香烟火和热辐射3种火源,研究机油含量对棉布引燃特性的影响。对于明火条件,还考查了机油含量和含水量对棉布燃烧特性的影响。热辐射引燃实验采用锥形量热仪进行,分别取热辐射强度为25、30、35、40kW/m2。结果表明:随着机油含量增加,明火和热辐射作用下棉布的引燃时间均逐渐缩短,香烟火条件下则影响较小;当机油含量达45%时,棉布被明火引燃的时间缩短近一半;明火作用下棉布的燃烧火焰持续时间先增大后减小,残留物质量先缓慢减小再迅速减小最后趋于恒定;对于29%机油含量的棉布,含水量越大引燃越困难,含水量达13%时棉布不能被引燃。

Three fire source of fire, cigarette and heat radiation were set to study the effects of the machine oil content on the ignition characteristics of cotton under the different fire source condition. Impacts of the machine oil content and water content on the combustion characteristics of cotton under the fire were also examined. The heat radiation ignition experiment was carried out by cone calorimeter with heat radiation intensity of 25, 30, 35 and 40 kW/m^2. The experiment results showed that the ignition time of cotton decreased under the fire and heat radiation with the increase of machine oil content, and the effect under the cigarette fire condition was small. The ignition time of cotton by fire was shorted by nearly a half when the content of machine oil was 45%. The duration of combustion flows under the fire condition firstly increased and then decreased, the resi due weight firstly decreased slowly and then decreased sharply finally trended to be constant. For the cotton with machine oil content of 29%, the larger water content of cotton, the more difficult to be ignited, and cotton cannot be ignited when the content of water in cotton was 13%.