01.2020.190.196

ENERGY CONVERSION IMPROVEMENT BY HEATING THE CENTER OF A STACK IN A STANDING-WAVE THERMOACOUSTIC-SYSTEM

Author(s):
Y. Kawashima†*, S. Sakamoto‡, R. Onishi†, D. Kuroki††, & Y. Watanabe††

Affiliation(s):
†Faculty of Science and Engineering, Doshisha University, 1-3 Tataramiyakodani, Kyotanabe, Kyoto 610-0321, Japan

‡School of Engineering, University of Shiga Prefecture, 2500 Yasaka-cho, Hikone, Shiga 522-8533,Japan

††Faculty of Life and Medical Science, Doshisha University, 1-3 Tataramiyakodani, Kyotanabe, Kyoto 610-0321, Japan

*Corresponding Author Email: ctwd0324@mail4.doshisha.ac.jp

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

The present paper describes the influence of the temperature distribution in the stack of a standing-wave thermoacoustic system on the energy conversion. The stack is heated at one end in the conventional thermoacoustic system. Since the temperature distributes weighted at the heated side in this method, the stack only partially contributes to the energy conversion. Hence, by newly placing a heater at the center of the stack, the method to make the whole stack contribute to the energy conversion is presented. The experiment is carried out by changing only the input to the heater at the center under the restriction of constant temperature at both ends of the stack. As the result, the temperature gradient produced uniform in the stack is confirmed to make twice the amount of the energy conversion comparing with the case of one-side heating. The contributing factor for this is surmised to be the realization of the energy conversion over the entire stack. From these results, it is suggested that the heating at the center of the stack is effective for enhancing the energy conversion.