Effect of Gedeon streaming on thermal efficiency of a travelling-wave thermoacoustic engine

Tang, Ke; Feng, Yanhui; Jin, Tao; Jin, Shenghan; Li, Ming; Yang, Rui

doi:10.1016/j.applthermaleng.2017.01.054

Cited by 21 publications

(3 citation statements)

References 40 publications

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“…However, a quantitative discrepancy is observed especially at high temperatures of the hot heat exchanger. We consider that the main reason of this quantitative discrepancy is the thermal nonlinear effects caused by acoustic streaming (Biwa et al, 2007), such as Gedeon streaming (Gedeon, 1997;Backhaus and Swift, 1999;Tijani and Spoelstra, 2011;Tang et al, 2017). These effects are estimated in experiment and not considered in the numerical calculation.…”

Section: Numerical Results and Discussion 31 Heating Performancementioning

confidence: 99%

Numerical investigation on a travelling wave thermoacoustic heat pump

Nasr

Bassem

Ueda

et al. 2018

JTST

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A thermoacoustic heat pump heater is a device having the ability to produce heat from acoustic power. The heat pump investigated was composed of an acoustic driver, a branched tube, and a looped tube. A porous component composed of many stacked steel screen meshes, called regenerator, was installed inside the looped tube. When an acoustic wave is supplied to the looped tube, filled with nitrogen gas at 0.5 MPa, heat pumping spontaneously occurs inside the regenerator. A numerical code was developed and tested. Then, the coefficient of performance was calculated for different temperatures by optimizing the regenerator flow channel radius and position inside the looped tube. It was found that the temperature affects considerably the regenerator optimum parameters.

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Section: Numerical Results and Discussion 31 Heating Performancementioning

confidence: 99%

Numerical investigation on a travelling wave thermoacoustic heat pump

Nasr

Bassem

Ueda

et al. 2018

JTST

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“…25 In order to verify whether the streaming can be enhanced by adding stages through observing the temperature distribution along the resonant tube, we modified the two-stage and four-stage LTTEs. It can carry heat from the HHX downwards to the next stage and thus may distort the temperature distribution in the resonant tube connected to the HHX.…”

Section: Experimental Setupsmentioning

confidence: 99%

“…It can carry heat from the HHX downwards to the next stage and thus may distort the temperature distribution in the resonant tube connected to the HHX. 25 In order to verify whether the streaming can be enhanced by adding stages through observing the temperature distribution along the resonant tube, we modified the two-stage and four-stage LTTEs. As shown in Figure 2, the LA was replaced by an R-C (resistance-compliance) load, which consists of a gas reservoir and a needle valve, to adjust the pressure amplitude at a given hot temperature.…”

Section: Experimental Setupsmentioning

confidence: 99%

Performance comparison of looped thermoacoustic electric generators with various thermoacoustic stages

et al. 2019

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Thermoacoustic engine is a kind of novel heat engine based on thermoacoustic effect, with the merits of environmental benignity, simplicity, and reliability. In this work, looped travelling-wave thermoacoustic electric generators (LTTEGs) with one to four thermoacoustic stages have been developed and experimentally studied. It is observed that adding thermoacoustic stages can improve the thermal-electric efficiency of LTTEGs, while whether the extra stages lead to efficiency gain depends on the number of existing stages and other operating parameters (hot temperature, for instance). One main reason is that the Gedeon streaming, which might cause severe heat loss, can be enhanced by adding thermoacoustic stages and increasing hot temperature. The results suggest that the suppression of streaming in the looped thermoacoustic engine with multiple stages is even more urgent than in the traditional travellingwave engine with only one stage.

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