以超燃冲压发动机再生冷却通道为研究对象，针对高超声速飞行器发动机点火启动时，壁面被快速加热产生的热声波从固体传播到流体域的现象开展了热流固声的多场耦合的瞬态数值模拟，主要关注热声波对结构应力极值的影响及热声波经过流固界面处的变化规律。研究了关键参数，如固体导热系数、杨氏模量、固体密度以及热膨胀系数对流固界面处热声波幅值与频率的影响。结果表明：结构的杨氏模量和密度变化导致波速变化，影响能量的传播速度，对界面处应力波动和压力变化的幅值和频率均有很大影响；改变导热系数导致温度场发生变化，进而影响应力波的幅值，导热系数增大1倍，应力峰值提高30%，但对应力波的频率几乎没有影响，对界面压力变化的幅值和频率影响有限；热膨胀系数增大1倍，壁面变形增大，导致界面处应力和压力峰值增大1倍，对其频率没有明显影响。

Transient numerical simulations of multi-field coupling involving heat， fluid， solid， and acoustics of regenerative cooling channels in scramjet engines are conducted. The phenomenon of thermoacoustic waves propagating from the solid to the fluid domain， as a result of the rapid heating of combustion chamber walls during ignition of scramjet engines， is examined. The impact of thermoacoustic waves on the extreme values of structural stress and the variation of these waves as they pass through the fluid-structure interface is analyzed. Key parameters such as thermal conductivity， Young’s modulus， density， and thermal expansion coefficient of thermal structure are investigated in terms of their effects on the amplitude and frequency of thermoacoustic waves at the fluid-structure interface. The results show that changes in the Young’s modulus and density of the structure lead to variations in wave speed， affecting the energy propagation speed and significantly influencing the amplitude and frequency of stress and pressure fluctuations at the interface. Altering the thermal conductivity causes variation in the temperature field， thereby affecting the amplitude of stress waves； doubling the thermal conductivity increases the stress peak by 30%， but has almost no effect on the frequency of stress waves and thus has limited impact on the amplitude and frequency of pressure at the interface. Doubling the thermal expansion coefficient increases wall deformation， leading to a doubling of the stress and pressure peaks at the interface， with no significant effect on their frequencies.