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中文摘要：
为探索燃烧过程中热声不稳定的产生及控制机理，采用计算流体力学（CFD）的方法，模拟了黎开（Rijke）管内的自激热声不稳定，得到了管内压力、速度、温度和气体密度的起振，最后达到极限周期的过程。通过压力与速度的相位分析，验证了瑞利准则（Rayleigh criterion）是维持Rijke管自激热声不稳定的关键因素；同时，模拟结果给出了Rijke管内的振荡流场和振荡温度场，实现了热声不稳定的可视化。通过与前人的试验研究相比发现，模拟值与试验数据基本一致，说明CFD是研究Rijke管自激热声不稳定的有力工具。
英文摘要：
In order to probe into the mechanism of the excitation and controlling strategy of thermoacoustic instability in the process of combustion, computational fluid dynamics（CFD） was employed to model the self-excited thermoacoustic instability in a Rijke tube combustor. The start-oscillation phenomenon and the limited cycle of the pressure, axis velocity, temperature and the gas density were obtained. The Rayleigh criterion as the key cause of the maintenance of self-excited thermoacoustic instability in Rijke tube combustor was verified using the phase analysis between the pressure and the axis velocity. The oscillating flow field and the temperature field were presented, which visualized the process of thermoacoustic instability. Contrasting to the previous experimental study, the numerical results agreed well with the experimental data, showing that the CFD method is a strong tool to study the self-excited thermoacoustic instability in Rijke tube combustor.
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