Influence of resonator length on the performance of standing wave thermoacoustic prime mover

• Main Authors: Achmadin, Wahyu Nur, Setiawan, Ikhsan, Utomo, Agung Bambang Setio, Nohtomi, Makoto
• Format: Conference Proceeding
• Language: English
• Subjects: Electric wire; Maximum power; Power efficiency; Resonators; Screens; Stainless steel; Stainless steels; Standing waves; Steel pipes; Temperature gradients; Thermoacoustics; Wire cloth
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/1.4958540

A research on the influence of resonator length on the performance of a standing wave thermoacoustic prime mover has been conducted. The thermoacoustic prime mover consists of an electric heater, a resonator tube filled with atmospheric air, and a stack. The stack was made of stainless steel wire mesh screens with mesh number of #14. The stack had a length of 5 cm and placed 13 cm from resonator hot-end. The resonator tube was made of stainless steel pipe with 6.8 cm inner diameter. The electric heater which has a maximum power capability of 299 W was attached to the hot side of the stack. We varied the resonator length from 105 cm until 205 cm. It was found that the thermoacoustic prime mover with a resonator length of 155 cm generated the sound with the smallest onset temperature difference and shortest time to reach the onset condition, those are 252 °C and 401 s, respectively. Also, the prime mover with a resonator length of 105 cm produced the highest frequency that is 174 Hz. On the other hand, by using resonator length of 180 cm, the prime mover generated the highest pressure amplitude of 0.0041 MPa, and the thermoacoustic device delivered the highest acoustic power of 2.8 W and efficiency of 0.9%.