论文标题
热声学及其在预混合火焰中的检测
Thermo-acoustics and its detection in a premixed flame
论文作者
论文摘要
在内部设计了一种基于光 - 物质相互作用的新光学技术，以检测点火后以及在半开通道中的预混合火焰前端传播时产生的热声障碍。该技术涉及将偏振光光线通过介质传递，其密度或折射率由于声波和/或火焰前方的通过而变化，然后通过光检测器通过分析仪捕获泄漏的去极光的光。该技术应用于涉及预混合火焰传播和郁金香反转的燃烧器。通过将示波器信号与流场的高速摄影进行比较，可以区分热声信号和火焰前端。发现声波在各种轴向位置和时间瞬间拦截了火焰传播。
A new optical technique based on light-matter interaction is devised in-house to detect thermo-acoustic disturbances generated after ignition and during propagation of a premixed flame front in a half open channel. The technique involves passing a polarized laser light through a medium whose density or refractive index varies due to the passage of acoustic waves and/or flame front and then capturing the leaked depolarised light through an analyser by a photo-detector. The technique is applied to combustor involving premixed flame propagation and tulip inversion. The thermo-acoustic signals and the flame front are distinguished by comparing the oscilloscope signal with high speed photography of the flow-field. Acoustic waves are found to intercept the flame propagation at various axial locations and time instants.
