摘要：为研究燃烧室结构对热、声激励的响应，本文基于多场耦合瞬态模拟技术，建立燃烧室结构有限元模型，模拟了瞬态条件下热、声激励下燃烧室结构的热应力、温度场和结构应力。结果表明：受热声耦合作用的影响，靠近出口处的声压幅值下降约75%。燃烧室所受热应力与声压应力量级相同，两者对结构的影响皆不可忽略。燃烧室结构对声压的响应与声压激励频率有关。当激励频率接近燃烧室固有频率时，声压应力将显著提高并出现共振。

A simulation modal which included combustion chamber and internal flow field was set up basing on the multi-field coupling technology in order to study the combustion chamber structural response of the thermo-acoustic excitation, and the change of internal flow field. The ignition and acoustic transmission process was simulated by using CFD software, and the response of the combustion chamber is analyzed. The results show that, Under the influence of thermo-acoustic coupling, the acoustic pressure distribution at different locations within the combustion chamber is uneven, and the amplitude of the acoustic pressure near the outlet is significantly reduced, the decrease is about 75%; The thermal stress is the same as the sound pressure stress level, and the influence of the two on the structure could not be neglected; The response of the combustion chamber structure to the sound pressure is related to the excitation frequency of the sound pressure. When the excitation frequency is close to the natural frequency of the combustion chamber, the sound pressure stress will be significantly improved.