Influence of the Acoustic Liner in Large Eddy Simulation of Longitudinal Thermoacoustic Instability in a Model Annular Combustor

  • MENG Sheng ,
  • ZHANG Man ,
  • GAO Yi
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  • 1. AECC Commercial Aircraft Engine Co., Ltd., Shanghai 200241, China
    2. School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai 200240, China

网络出版日期: 2024-03-07

基金资助

This work is financially supported by the Natural Science Foundation of Shanghai (Grant No. 22ZR1467900), the National Natural Science Foundation of China (Grant No. 52076136 and U2141221), and the National Major Science and Technology Project of China (Grant No. J2019-III-0002-0045).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024

Influence of the Acoustic Liner in Large Eddy Simulation of Longitudinal Thermoacoustic Instability in a Model Annular Combustor

  • MENG Sheng ,
  • ZHANG Man ,
  • GAO Yi
Expand
  • 1. AECC Commercial Aircraft Engine Co., Ltd., Shanghai 200241, China
    2. School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai 200240, China

Online published: 2024-03-07

Supported by

This work is financially supported by the Natural Science Foundation of Shanghai (Grant No. 22ZR1467900), the National Natural Science Foundation of China (Grant No. 52076136 and U2141221), and the National Major Science and Technology Project of China (Grant No. J2019-III-0002-0045).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024

摘要

尽管人们在燃烧热声不稳定性研究方面做了大量努力,但在现代燃气轮机或航空发动机中成功抑制热声压力振荡仍然具有挑战性。本文通过大涡模拟研究了声衬对模型环形燃烧室纵向热声模态的影响。对于没有声衬的情况,模拟得到的自激纵向热声不稳定结果与实验得到的热声频率和模态结果非常吻合。随后,我们计算了三种不同声衬偏流速度下的环形燃烧室热声振荡特性。结果表明,燃烧室壁面声衬的存在不仅会影响声场,还会影响流场。当偏流速度较大时,会导致强烈的湍流波动,从而使得压力振荡出现间歇性。这表明流动波动和压力振荡之间的耦合在热声系统间歇性的动态过程中起着重要作用。通过进一步动力学分析,表明这种间歇性是由流场对火焰-声耦合的影响造成的。最后,我们采用了一种基于范德波尔(VdP)振荡器的低阶建模方法,通过加入随机强迫,以再现热声系统的演变特性。虽然与实际燃烧系统相比,该低阶模型较为简单,但它仍然有助于我们理解声衬在燃烧室中的抑制效果,以及应用这种装置的潜力。

本文引用格式

MENG Sheng , ZHANG Man , GAO Yi . Influence of the Acoustic Liner in Large Eddy Simulation of Longitudinal Thermoacoustic Instability in a Model Annular Combustor[J]. 热科学学报, 2024 , 33(2) : 710 -724 . DOI: 10.1007/s11630-024-1928-x

Abstract

Although extensive efforts have been made to dampen the thermoacoustic instability, successfully controlling the pressure oscillations in modern gas turbines or aeroengines remains challenging. The influence of the acoustic liner on the longitudinal thermoacoustic mode in a model annular combustor is investigated by Large Eddy Simulation (LES) in this work. The result of the self-excited longitudinal thermoacoustic instability without the liner agrees well with the frequency and acoustic analysis of the pressure mode based on experimental data. Three different bias flow velocities of the liner located downstream of the combustor are then simulated. The results reveal that the existence of the liner influences not only the acoustic field but also the flow field. When the bias velocity is large, it leads to intense turbulence-induced fluctuations, and the pressure oscillation is modulated intermittently. It shows that the weak coupling between flow and pressure oscillations plays a significant role in the onset of the intermittency of a thermoacoustic system. Based on the dynamic analysis of the thermoacoustic system with the acoustic liner, this intermittency is caused by the influence of the flow field on the flame-acoustic coupling. Finally, a low-order modeling method based on Van der Pol (VdP) oscillator with additive stochastic forcing is conducted to reproduce the evolving dynamics of the thermoacoustic system. Although the numerical cases demonstrated in this work are relatively simpler than those in a practical combustion system, the results are helpful for us to understand the effect of the acoustic liner and show the attractive potential to apply this device to suppress thermoacoustic instability.

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