Experimental Study on a Standing Wave Thermoacoustic Prime Mover with Air Working Gas at Various Pressures

[摘要] Thermoacoustic prime mover is an energy conversion device which converts thermal energy into acoustic work (sound wave). The advantages of this machine are that it can work with air as the working gas and does not produce any exhaust gases, so that it is environmentally friendly. This paper describes an experimental study on a standing wave thermoacoustic prime mover with air as the working gas at various pressures from 0.05 MPa to 0.6 MPa. We found that 0.2 MPa is the optimum pressure which gives the lowest onset temperature difference of 355 °C. This pressure value would be more preferable in harnessing low grade heat sources to power the thermoacoustic prime mover. In addition, we find that the lowest onset temperature difference is obtained when rh/δkratio is 2.85, where rhis the hydraulic radius of the stack and δkis the thermal penetration depth of the gas. Moreover, the pressure amplitude of the sound wave is significantly getting larger from 2.0 kPa to 9.0 kPa as the charged pressure increases from 0.05 MPa up to 0.6 MPa.

[发布机构] Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara BLS 21, Yogyakarta; 55281, Indonesia^1;Department of Mechanical and Industrial Engineering, Faculty of Engineering, Universitas Gadjah Mada, Jl. Teknika Utara, Yogyakarta, Indonesia^2;Graduate School of Environment and Energy Engineering, Waseda University, Nishi-tomita 1011, Honjo, Saitama, Japan^3

[效力级别] 化学

[关键词] Energy conversion devices;Hydraulic radius;Low grade heat sources;Onset temperature;Pressure amplitudes;Pressure increase;Thermal penetration depths;Thermoacoustic prime mover