Dai Qingling, Zhang Shengbo, Zhang Shiwei, Sun Huilai, Huang Mingming
School of Mechanical and Intelligent Manufacturing, Jiu Jiang University, Jiujiang, Jiangxi 332005, China.
School of Mechanical and Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China.
ACS Omega. 2021 Oct 5;6(41):27140-27149. doi: 10.1021/acsomega.1c03814. eCollection 2021 Oct 19.
In this work, the propagation of CH/air deflagration flames in three semi-confined ducts with different obstacles was numerically investigated using large eddy simulation (LES). The shape of the premixed flame, flow field structure, and overpressure characteristics of the interaction between the flame and the obstacle are simulated accurately in three ducts with obstacles of different heights. The results show that the structure of the flame is changed by the presence of obstacles, and a change in the shape of the hemispherical conical brush appears, and a flame vortex is generated by the entrapment of unburned premixed gas on the left side of the obstacles. In the process of CH/air deflagration, the existence of obstacles would lead to the change in combustion velocity and overpressure relief velocity and then have a certain influence on the peak of overpressure and the shape of the premixed flame.
在这项工作中，采用大涡模拟（LES）对CH/空气爆燃火焰在三种带有不同障碍物的半封闭管道中的传播进行了数值研究。在三种具有不同高度障碍物的管道中，精确模拟了预混火焰的形状、流场结构以及火焰与障碍物相互作用的超压特性。结果表明，障碍物的存在改变了火焰结构，出现了半球形锥形刷形状的变化，并且在障碍物左侧因未燃烧预混气体的截留而产生了火焰涡。在CH/空气爆燃过程中，障碍物的存在会导致燃烧速度和超压释放速度的变化，进而对超压峰值和预混火焰形状产生一定影响。
