Experimental demonstration of thermoacoustic energy conversion in a resonator

Abstract

Using thermoacoustic energy conversions, both amplification and damping of acoustic intensity are demonstrated. A differentially heated regenerator is installed near the velocity node of the resonator and thereby a high specific acoustic impedance and a traveling wave phase are obtained. It is shown that the gain of acoustic intensity resulting from the traveling wave energy conversion reaches 1.7 in a positive temperature gradient and 0.3 in a negative gradient. When the regenerator is replaced with a stack, it is found that the gain reaches 2.3, exceeding the temperature ratio (=1.9) of both ends of the stack. This is brought about by the addition of standing wave energy conversion. The present results would contribute to the development of new acoustic devices using thermoacoustic energy conversion.

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

“…Therefore, the optimum amplitude pressure on the thermoacoustic prime mover engine this research generated by the length of tube resonator 180 cm. The research result similar to the studies has been conducted by Biwa [9]. Biwa has conducted research to know energy conversion performance thermoacoustic with two types of the stack.…”

Experimental investigation of thermal performance of random stack materials for use in standing wave thermoacoustic refrigerators

“…The impact of the Page 3 of 31 operating frequency and temperature difference between the stack ends on the refrigeration power was studied using network and thermodynamic models, as well as experimental approaches (Jebali et al, 2004). Another important strand of research involves looking at the physics of the thermoacoustic effect, for example the experimental demonstration of the thermoacoustic effect (Biwa et al, 2004) and the nonlinear acoustic streaming that often takes place in such systems (Bailliet et al, 2001). …”

Influence of parameter on the performance of a standing-wave thermoacoustic prime mover

“…Ueda et al [2] constructed a looped tube thermoacoustic prime mover and studied the acoustic fields generated by stacks with different ωτ. Biwa et al [3] demonstrated thermoacoustic conversions in the stack with ωτ = 0.13 and ωτ = 3.5 by making full use of the acoustic field induced in the resonator. Tsuji [4] reported a design for insertion position and channel radius of the stack in a thermoacoustic cooling system by considering ωτ parameter.…”