通过对影响油气受热着火的关键因素进行研究，为发展主动防护技术提供理论依据。基于系统的实验和分析，探究了快速氧化现象、热源加热速度、热源面积与爆燃空间比例对热着火发生时临界浓度、着火概率和着火延迟期的影响，提出了温升热源条件受限空间能否发生热着火的综合判据。该判据认为：如果油气体积分数低于2.4%，受限空间体积与热源面积比值小于0.64 m，那么即使温度达到873 K，湿度降低到18%～21%，着火也不会发生。%The purpose of this paper is to provide theory for the development of protective technology against fire through re-search on the key factor of thermal ignition of gasoline-air mixture under the condition of heat source of temperature rising. The ef-fects of heating speed of heat source,rapid oxidation phenomenon,and strict of space scale on the critical concentration,ignition in-tensity and probability,ignition delay period are explored. Based on debate of experiment results,the general criteria of thermal igni-tion under the condition of gasoline-air mixture contacting with hot wall continuously where temperature is rising have been got. They are as follows:if gasoline stream concentration is less than 2.4%,the ration of space volume and heat wall area is less than 0.64 m;then even temperature gets to 873 K and ambient humility is less than 18%~21%,thermal ignition can not happen.
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