中文摘要：

时均流诱导的声振荡可以为热声制冷提供驱动源或驱动发电机和换能器发电，为风能利用提供了新思路，是热声领域的最新研究方向之一。本文基于计算流体动力学（CFD）方法，建立了正十字型时均流激声发动机的三维数学模型，采用大涡模拟湍流模型计算。计算结果验证了时均流诱导声振荡效应，揭示出谐振管内声场分布和谐振管内部压力与开口处涡的关系，为后续的实验研究奠定了理论基础。

英文摘要：

The acoustic oscillation induced by mean flow can be used to drive thermoaeoutic refrigerator, generator and transducer, providing a new idea for wind power exploitation, which is one of the newest research interests in thermoacoutic field. In this study, based on computational fluid dynamics, a three dimensional numerical model of mean flow engine with cross junction configuration was built. The turbulence model of large eddy simulation was applied. Computational results demonstrated the effect of mean flow-induced acoustic oscillation, revealed the acoustic field distribution in resonator, and showed the relationship between acoustic oscillation in resonator and vortex in the opening of resonator, which set up theoretical basis for experimental study.