横向声波作用下油池火焰燃烧行为模拟  

Simulation of Combustion Behavior of Pool Flame Under Transverse Acoustic Wave

作　　者：张玉涛 林国铖 张园勃 杨杰 黄一鸣 Zhang Yutao;Lin Guocheng;Zhang Yuanbo;Yang Jie;Huang Yiming(School of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]西安科技大学安全科学与工程学院,西安710054

出　　处：《燃烧科学与技术》2023年第4期381-389,共9页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51774233).

摘　　要：为研究声波对开放环境下油池火焰的扰动行为,基于对流传质模型对声压为0.85 Pa、2.10 Pa、3.42 Pa和4.78 Pa声波作用下的油池火焰进行了模拟研究.模拟结果与实验结果在火焰形态、燃烧质量损失等方面符合较好.研究发现,声压的增加能够使得空气与油池表面的乙醇气体层混合得更为均匀,进而促进油池杯口局部区域的燃烧;当火焰在声波作用0.4 s后进入周期性脱落状态,脱落周期与声波周期一致.油池表面温度在不稳定流带来强迫对流作用以及火焰自身热反馈作用下振荡变化,在频域上也表现出噪声信号.声波能够引起火焰两侧涡旋对的不对称变化,使火焰发生破碎,正涡量与负涡量交错区域增大.此外,声压的提高能够加快火焰表面涡旋的运动速度并加剧火焰局部结构的拉伸断裂.本研究为声波控制油池火焰燃烧行为的相关研究提供了参考.In order to study the control behavior of acoustic wave on pool flame in open environment,the pool flame under the acoustic pressure of 0.85 Pa,2.10 Pa,3.42 Pa and 4.78Pa was simulated,respectively,based on the convective mass transfer model.The results show that the simulation results are in good agreement with the experimental results in terms of flame shape and combustion mass loss.It is found that the increase of sound pressure can make the air more evenly mixed with the ethanol gas layer on the surface of the pool,thus promoting the combustion in the local area of the cup mouth of the pool.When the flame enters the periodic shedding state after 0.4 s of sound wave action,the shedding period is consistent with the sound wave period.The pool surface temperature oscillates under the forced convection caused by unstable flow and the thermal feedback of the flame itself,and a noise signal occurs in the frequency domain.The acoustic wave can cause the asymmetric change of vortex pairs on both sides of the flame,break the flame,and increase the staggered area of positive vorticity and negative vorticity.In addition,the increase of sound pressure can accelerate the movement of vortex on the flame surface and aggravate the tensile fracture of local structure of flame.This study provides a reference for the research on the combustion behavior of pool flame controlled by acoustic waves.

关 键 词：声波强迫 油池火焰 对流传质 傅里叶变换 拉伸率 

分 类 号：TF051[冶金工程—冶金物理化学]