热声交变流动是热声热机的工作基础,研究交变流动机理有助于人们认识热声热机的工作过程。鉴于前人的理论分析一般没有考虑浮力效应的影响,本文从流体热动力学的角度研究了浮力对流与热声交变流动的耦合规律。基于线性理论方法,给出了考虑浮力项和热对流Rayleigh数的热声线性理论模型,分析了浮力效应对平行交变流动的影响,发现热对流的存在明显影响交变流动速度分布及其“环形效应”。 Acoustic thermoacoustic flow is the basis of thermoacoustic heat engine. Studying alternating flow mechanism helps people understand the working process of thermoacoustic heat engine. In view of the fact that the theoretical analysis of the predecessors generally does not consider the influence of buoyancy effect, this paper studies the coupling law of buoyancy convection and thermoacoustic alternating flow from the perspective of fluid thermodynamics. Based on the linear theory method, the thermoacoustic linear model considering the buoyancy term and the convective Rayleigh number is given. The effect of buoyancy on the parallel alternating current is analyzed. It is found that the existence of the convective heat affects the velocity distribution of alternating current “Ring effect ”.