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首页> 外文期刊>Combustion and Flame >Investigations On The Self-excited Oscillations In A Kerosene Spray Flame
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Investigations On The Self-excited Oscillations In A Kerosene Spray Flame

机译：煤油喷雾火焰中自激振荡的研究

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A laboratory scale gas turbine type burner at atmospheric pressure and with air preheat was operated with aviation kerosene Jet-A1 injected from a pressure atomiser. Self-excited oscillations were observed and analysed to understand better the relationship between the spray and thermo-acoustic oscillations. The fluctuations of CH* chemiluminescence measured simultaneously with the pressure were used to determine the flame transfer function. The Mie scattering technique was used to record spray fluctuations in reacting conditions with a high speed camera. Integrating the Mie intensity over the imaged region gave a temporal signal acquired simultaneously with pressure fluctuations and the transfer function between the light scattered from the spray and the velocity fluctuations in the plenum was evaluated. Phase Doppler anemometry was used for axial velocity and drop size measurements at different positions downstream the injection plane and for various operating conditions. Pressure spectra showed peaks at a frequency that changed with air mass flow rate. The peak for low air mass flow rate operation was at 220 Hz and was associated with a resonance of the supply plenum. At the same global equivalence ratio but at high air mass flow rates, the pressure spectrum peak was at 323 Hz, a combustion chamber resonant frequency. At low air flow rates, the spray fluctuation motion was pronounced and followed the frequency of the pressure oscillation. At high air flow rates, more effective evaporation resulted in a complete disappearance of droplets at an axial distance of about 1/3 burner diameters from the injection plane, leading to a different flame transfer function and frequency of the self-excited oscillation. The results highlight the sensitivity of the self-excited oscillation to the degree of mixing achieved before the main recirculation zone.
机译：在大气压力和空气预热下的实验室规模燃气轮机式燃烧器，是通过从压力雾化器注入的航空煤油Jet-A1来运行的。观察和分析自激振荡，以更好地了解喷雾与热声振荡之间的关系。与压力同时测量的CH *化学发光的波动用于确定火焰传递函数。使用Mie散射技术通过高速相机记录反应条件下的喷雾波动。对成像区域上的Mie强度进行积分可得到与压力波动同时获得的时间信号，并评估了从喷雾散射的光与气室中的速度波动之间的传递函数。相位多普勒风速仪用于在注入平面下游的不同位置以及各种工况下进行轴向速度和液滴尺寸的测量。压力谱显示出峰值，其频率随空气质量流量而变化。低空气质量流量运行的峰值为220 Hz，与供气室的共振有关。在相同的全局当量比下，但在高空气质量流量下，压力谱峰在323 Hz（燃烧室共振频率）处。在低空气流量下，喷雾波动运动明显，并遵循压力振荡的频率。在高空气流速下，更有效的蒸发导致液滴在距喷射平面约1/3的燃烧器直径的轴向距离处完全消失，从而导致不同的火焰传递函数和自激振荡频率。结果突出了自激振荡对在主再循环区之前达到的混合程度的敏感性。

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