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Impact of Pressure and Fuel Flow Rate on Flame Dynamics in a High Pressure Combustor

机译：压力和燃料流量对高压燃烧器火焰动力学的影响

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This paper describes experiments and analysis on the coupling effects of chamberrnpressure and fuel flow rate on methane-air diffusion flame flickering behaviour.rnPhotomultipliers and high speed imaging techniques have been used to study the frequencyrnand magnitude of the flame oscillation and the change in global flame shape. The instabilityrnbehaviour of the flame was observed to be sensitive to both the fuel flow rate and pressure.rnHigh-speed imaging has shown that the periodical break-up of the methane flame at higherrnflow rates is almost symmetric. However, the methane flames at lower flow rates oscillate inrna more waving manner due to the alternating lateral nature of the outer vortices. The flamernoscillation magnitude (Lf) and oscillation wavelength (l) were obtained from the high speedrnimaging database. It has been observed that the trends of these parameters correlate wellrnwith the standard deviation (s) of mean pixel intensity (MPI), measured from the flame highrnspeed images. The increase in fuel flow rate was observed to increase the magnitude ofrnoscillation. The flickering frequency, however, remains almost constant at each pressure.rnThe dominant flickering frequency of a methane diffusion flame varies with the chamberrnpressure as a function of Pn (f=15.7P0.17).
机译：本文描述了室压和燃料流量对甲烷-空气扩散火焰闪烁行为的耦合效应的实验和分析。rn已使用光电倍增管和高速成像技术研究了火焰振荡的频率和幅度以及整体火焰形状的变化。观察到火焰的不稳定性对燃料流率和压力都敏感。高速成像表明，在较高流率下甲烷火焰的周期性破裂几乎是对称的。然而，由于外部涡流的交替横向特性，较低流速的甲烷火焰以更大的波动方式振荡。从高速成像数据库获得了火焰振荡振幅（Lf）和振荡波长（l）。已经观察到，这些参数的趋势与从火焰高速图像测量的平均像素强度（MPI）的标准偏差相关。观察到燃料流速的增加增加了超晶核化的幅度。然而，闪烁频率在每个压力下几乎保持恒定。甲烷扩散火焰的主要闪烁频率随室压随Pn的变化而变化（f = 15.7P0.17）。

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