Dependence of Thermal Efficiency on the Ratio of Regenerator Channel Radius to Thermal Penetration Depth of the Traveling Wave Thermoacoustic Engine

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  • 蓄熱器流路半径と熱境界層厚さの比に対する進行波型熱音響機関の熱効率依存性

Abstract

When a traveling wave pass in the direction of a positive temperature gradient in a porous media whose channel radius is similar to the thermal penetration depth, the gases in the regenerator undergoes the isothermal thermodynamic cycle ideally. However, in an actual engine, there are regions where viscous dissipation dominates and regions where adiabatic cycles occur depending on the ratio of the channel radius to the thermal boundary layer thickness. Therefore, it is necessary to set the ratio of the channel radius to the appropriate thermal boundary layer thickness under the operating conditions. In this study, the thermal efficiency was measured while changing the ratio of regenerator channel radius to thermal penetration depth of the traveling wave thermoacoustic engine, and the dependence is experimentally verified.

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