The output characteristics affected by stack shape in loop-tube type thermoacoustic engine are experimentally investigated. The loop-tube type thermoacoustic engine consists of a stack, heat exchangers, resonance tube, and working gas. For the thermoacoustic engine, a thin tube ceramic honeycomb was introduced as a stack, and air was introduced as a working gas. The system performance is experimentally examined for various cell densities and lengths of stack, and heater input to one side of stack. Here, the work intensity, that is the power intensity of the generated sound, is theoretically estimated using a two-sensor method from the pressure amplitude and phase difference of the sound inside a resonance tube. The output characteristics of the sound generator are shown by the work intensity and the conversion efficiency from heater input to sound intensity.
