为了更好地抑制实际燃气轮机等动力装置中潜在的热声振荡现象，基于水平Rijke管开展了管内自激振荡特性及抑制方法的数值模拟和实验研究。首先，通过数值模拟研究获得了管内自激振荡发生的过程及频率特性，验证了Rijke管热声振荡所遵循的Rayleigh准则及纵向振荡模式；然后，结合实验测试与数值模拟研究，在Rijke管硬壁面上安装不同长度的穿孔背腔，随着背腔长度的增加，Rijke管内发声区间在缩短，并能有效降低热声振荡的声压幅值，实验结果与数值模拟结果吻合良好；进一步进行数值模拟研究，并在穿孔背腔这一被动控制方法的基础上通过小孔通以偏流作为主动控制因素，随着偏流马赫数的增加，管内振荡声压降低，振荡衰减，初步验证了穿孔背腔通偏流这一主/被动复合控制方法对热声振荡的有效抑制作用。

In order to suppress the potential thermoacoustic oscillation phenomenon in power plants effectively，such as actual gas turbine，etc.，numerical simulation and experimental research on the characteristics and suppression methods of selfexcited oscillation in a horizontal Rijke tube are carried out.Firstly，the process and frequency characteristics of selfexcited oscillation are obtained based on numerical simulation，the Rayleigh criterion and longitudinal oscillation mode of thermoacoustic oscillation are verified.Then，combining experimental test and numerical simulation,perforated liners with different lengths are installed on the hard wall surface of Rijke tube.With the increase of the liner length，the acoustic interval in Rijke tube reduces，which can decrease sound pressure amplitude of thermoacoustic oscillation effectively.Experimental result agrees well with numerical simulation result.Furthermore，through the numerical simulation results，the bias flow as an active control factor is adopted based on the passive control method of perforated liner.The oscillation sound pressure decreases and the oscillation decays with the increase of the Mach number of the bias flow，which preliminarily verifies that the active/passive composite control method of bias flow through perforated liner can suppress thermoacoustic oscillation effectively.

O551.3

国家自然科学基金（51576159）