Oscillating flow is the base research of thermoacoustic engine.Analyzing oscillating flow mechanism can help us understand the working process of thermoacoustic engine.Former theoretical analysis did not consider buoyancy effects.In present paper,the coupling mechanism of thermoacoustic oscillating flow and natural convection is analyzed theoretically.A thermoacoustic linear theory model considering buoyancy effect(Rayleigh number) is presented and evident effects of natural convection on the ’velocity distribution’ are found by using linear theory method.
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