Acoustic field in a thermoacoustic Stirling engine having a looped tube and resonator

Ueda, Yuki; Biwa, Tetsushi; Mizutani, Uichiro; Yazaki, Taichi
December 2002
Applied Physics Letters;12/30/2002, Vol. 81 Issue 27, p5252
Academic Journal
S. Backhaus and G. W. Swift [Nature 399, 335(1999)] have built a prototype thermoacoustic Stirling engine based on traveling wave energy conversions, and demonstrated that its efficiency reached above 40% of the Camot efficiency. We experimentally investigate an acoustic field in the engine through simultaneous measurements of velocity U and pressure P. By focusing on the phase lead Φ of U relative to P in its regenerator, we find that the engine can achieve such a high efficiency by the negative Φ about -20° rather than a traveling wave phase (Φ = 0).


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