Attenuation effects of perforated plates with heterogeneously distributed holes on combustion instability in a spray fla
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DOI 10.1007/s12206-020-1042-2
Journal of Mechanical Science and Technology 34 (11) 2020 Original Article DOI 10.1007/s12206-020-1042-2 Keywords: · Bias flow · Combustion instability · Heterogeneously distributed holes · Perforated plates · Spray
Attenuation effects of perforated plates with heterogeneously distributed holes on combustion instability in a spray flame combustor Hao Zhou, Zihua Liu, Hao Fang, Chengfei Tao, Mingxi Zhou and Liubin Hu
Correspondence to: Hao Zhou [email protected]; Mingxi Zhou [email protected]
Citation: Zhou, H., Liu, Z., Fang, H., Tao, C., Zhou M., Hu, L. (2020). Attenuation effects of perforated plates with heterogeneously distributed holes on combustion instability in a spray flame combustor. Journal of Mechanical Science and Technology 34 (11) (2020) 4865~4875. http://doi.org/10.1007/s12206-020-1042-2
Received June 10th, 2020 Revised
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Zheda Road 38, Hangzhou 310027, China
Abstract
Perforated plates have been widely used in combustors to attenuate harmful sounds. In this study, the acoustic absorption capability of plates with heterogeneously distributed holes under bias flow was evaluated in an impedance tube, and the sound attenuation effect of each plate located in the liquid fuel combustor inlet section was experimentally studied. The perforated plate with heterogeneously distributed large holes showed the best control effect under the designed experimental conditions. After control, the peak dynamic pressure in the chamber and plenum decreased by 90 % and 75 %, respectively, and the reduction in the heat release fluctuation was 60 %. When the primary air flow rate deviated from the optimal value, the plate with large holes still reduced the pressure amplitude in the chamber by approximately 70 %. It was also found that installing the perforated plate with a back cavity had the dual effect of gaining and damping combustion instability.
August 13th, 2020
Accepted August 18th, 2020 † Recommended by Editor Yong Tae Kang
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
1. Introduction Currently, combustion instability has become one of the major challenges in the design and development of modern industrial furnaces, gas turbines, and liquid rockets [1, 2]. Unsteady heat release is generated by the perturbations of the flame area, which acts as a sound radiation source in turn. The self-sustained combustion oscillations are usually generated due to the dynamic interactions between unsteady heat release and oscillatory acoustic flow, as first proposed by Rayleigh [3]. The formation of instabilities in liquid spray lean combustion is more complicated than that in lean premixed combustion, because the atomization and vaporization, droplet size and distribution, droplets-vapor-air entrainment and mixing, and droplets-flameturbulence interactions will all affect the heat release process [4, 5]. Some acoustic oscillations in the inlet tube are associated
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