Numerical Simulation For Thermoacoustic Effect In Rijke Tube And Thermoacoustic Cooler

The mechanism of Thermoacoustic phenomenon in a Rijke tube is researched by the CFD method. The theoretical model on the flow and heat transfer for Thermoacoustic effect, including continuity equation, momentum equations and the energy equation, state equation of ideal gas, k-epsilon model for turbulence, flow and heat transfer models in the porous media material, has been established firstly. Then, the Rijke tube is simulated detailed, and the process of oscillation starting up and the limit cycle oscillation is predicted carefully. A method of the phase analyses and FFT analyses is used to deal with the simulated results of Thermoacoustic phenomenon. Lastly, a series of filled contours of pressure in the Rijke tube model are illustrated the spatial and temporal change of Thermoacoustic clearly.As an application, Thermoacoustic cooling was investigated. The cooling effect of Thermoacoustic cooler was predicted by numerical method evidently. The improvement on the figuration and inner configuration are carried out for Thermoacoustic cooler device, and a more excellent cooling effect is exhibited in the later case. It is shown that temperature at different location in the cooler is varied under the affect of acoustic wave. The temperature decrease evidently in the resonance tube, and in contrast, it increased rapidly at the hot heat exchangers. The critical device of the cooler is Heat Exchangers, and the figuration of the cooler model will affect the cooler's effect, but less important. The generation and breaking up of eddy at two opening of the inner tube periodically is the critical factor in heat pumping.It is meaningful of these results in the in-depth comprehension of thermoacoustic phenomenon and the development of thermoacoustic engine.