밀폐관형과 개방관형 열음향 냉동기의 2차, 3차 하모닉에 관한 특성 연구

An Experimental Study on the 2nd,3rd Harmonic Characteristic for open-tube-type and close-tube-type Thermoacoustic Refrigerators

The thermoacoustic refrigerator has not only considerable possibility but also commercial usability, because it has high reliability, lower vibration, no moving part, and can easily be constructed. In order to determine the optimum resonant tube length and the frequency, the open-tube-type(3$\lambda$/4) and close- tube - type (2$\lambda$/2) thermoacoustic refrigerator were constructed. In third harmonic, the temperature difference of 3$\lambda$/4 refrigerator was $53^{\circ}C$(resonator length :400mm). In second harmonic, the temperature difference of 2$\lambda$/2 refrigerator was $51^{\circ}C$(resonator length :400mm).