旋流对冲正庚烷液池着火温度影响机理研究  

Ignition Mechanism of N-Heptane Liquid Pool in a Rotating Counter Flow

作　　者：陆祖安 杨金玲 邹春[2] 李文宇 贾汇桥 夏文祥 史海洋 Lu Zu’an;Yang Jinling;Zou Chun;Li Wenyu;Jia Huiqiao;Xia Wenxiang;Shi Haiyang(Guangdong Midea Kitchen&Water Heater Appliances Manufacturing Co.Ltd,Foshan 528000,China;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]广东美的厨卫电器制造有限公司,佛山528000 [2]华中科技大学煤燃烧国家重点实验室,武汉430074

出　　处：《燃烧科学与技术》2023年第4期421-428,共8页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51776081).

摘　　要：采用数值模拟方法对正庚烷液池在不同入射速度和不同转速下的着火温度进行了数值模拟.结果表明:在一定的入射速度下,正庚烷着火温度随转速的增加而单调下降.根据扩散和化学反应的影响,正庚烷液池在旋转对冲中的着火机理可分为3种类型:第1类型中,扩散对着火温度的影响占主导地位;在第2种类型中,一个重要特征是形成了回流区,此时扩散和化学反应共同主导着火温度.第3种类型中,化学反应在着火过程中起主导作用.The ignition temperature of a n-heptane liquid pool in a rotating counterflow configuration is investigated numerically at different injection velocities and various rotational speeds.The results show that,at a fixed injection velocity,the n-heptane ignition temperature decreases monotonically with the increase of rotational speed.The ignition mechanism of the n-heptane liquid pool in a rotating counterflow can be divided into three types according to the effects of diffusion and chemical reactions.In the first type,the effects of diffusion are dominant on the ignition temperature.In the second type,a backflow zone occurs,and diffusion and chemical reactions jointly exert comparable influence on the ignition temperature.In the third type,the effects of chemical reactions dominate the ignition.

关 键 词：稀薄燃烧 旋流 正庚烷 着火特性 回流区 

分 类 号：TK11[动力工程及工程热物理—热能工程]