多孔径穿孔板控制液雾燃烧不稳定的研究

研究了一种带可调背腔的多孔径穿孔板声阻尼器的吸声特性，并通过声学模型预测了穿孔板的吸声特性。实验研究了偏流穿孔板对液雾燃烧器的燃烧室、气室内波动的动态压力及热释放率的控制效果。多孔径穿孔板存在两种孔径:小孔半径均为1.0 mm，大孔半径分别为1.5、2.0、2.5、3.0 mm。发现孔径差异过大的穿孔板消声性能不佳。但是大小孔径相近的穿孔板对腔室内的热声振荡有明显衰减效果。安装穿孔板后，燃烧室脉动压力下降59%~84%，放热波动下降47%~87%，同时火焰形态变得稳定。 

Study on controlling liquid fuel spray combustion instability by multi-aperture perforated plate

The sound absorption characteristics of the multi-aperture perforated plate acoustic dampers with adjustable back cavities were studied. The sound absorption characteristics of the perforated plates were predicted via an acoustic model. The experiment was conducted to research the control effect of the perforated plates on the dynamic pressure and heat release rate in the chamber and plenum under a bias flow. The multi-aperture perforated plates had two apertures:the radius of the small holes was 1. 0 mm,and the radii of the large holes were 1. 5,2. 0,2. 5, 3. 0 mm, respectively. It was found that the sound absorption performance of perforated plates with large difference in aperture was not good. However, perforated plates with small difference in aperture had a significant attenuation effect on the thermoacoustic oscillations in the chamber. After installing the perforated plate, the pressure in the chamber was reduced by 59%-84%, the heat release fluctuation was reduced by 47%-87%,and the flame shape can be stabilized.