Journal ArticleDOI
A thermoacoustic-Stirling heat engine: detailed study
Scott Backhaus,Gregory W. Swift +1 more
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TLDR
A new type of thermoacoustic engine based on traveling waves and ideally reversible heat transfer is described and data are presented which show the nearly complete elimination of the streaming convective heat loads.Abstract:
A new type of thermoacoustic engine based on traveling waves and ideally reversible heat transfer is described. Measurements and analysis of its performance are presented. This new engine outperforms previous thermoacoustic engines, which are based on standing waves and intrinsically irreversible heat transfer, by more than 50%. At its most efficient operating point, it delivers 710 W of acoustic power to its resonator with a thermal efficiency of 0.30, corresponding to 41% of the Carnot efficiency. At its most powerful operating point, it delivers 890 W to its resonator with a thermal efficiency of 0.22. The efficiency of this engine can be degraded by two types of acoustic streaming. These are suppressed by appropriate tapering of crucial surfaces in the engine and by using additional nonlinearity to induce an opposing time-averaged pressure difference. Data are presented which show the nearly complete elimination of the streaming convective heat loads. Analysis of these and other irreversibilities show which components of the engine require further research to achieve higher efficiency. Additionally, these data show that the dynamics and acoustic power flows are well understood, but the details of the streaming suppression and associated heat convection are only qualitatively understood.read more
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Journal ArticleDOI
Cryocoolers: the state of the art and recent developments.
TL;DR: A review of the state of the art and on-going developments of these five kinds of cryocoolers can be found in this paper, where the general trend of new research on these three types is also presented.
Cryocoolers: the state of the art and recent developments
TL;DR: A review of the state of the art and on-going developments of these five kinds of cryocoolers can be found in this paper, where the general trend of new research on these three types is also presented.
Journal ArticleDOI
Design environment for low-amplitude thermoacoustic energy conversion (DeltaEC)
TL;DR: The Los Alamos thermoacoustics code, available at www.lanl.gov/thermoACoustics/, has undergone extensive revision this year, and a Python-based graphical user interface wrapped around that core provides improved usability as discussed by the authors.
Journal ArticleDOI
Stirling cycle engines for recovering low and moderate temperature heat: A review
TL;DR: In this article, a review of the research development of Stirling cycle engines for recovering low and moderate temperature heat is presented, which includes four types of engines: kinetic, thermoacoustic, free-piston, and liquid piston types.
Journal ArticleDOI
Travelling-wave thermoacoustic electricity generator using an ultra-compliant alternator for utilization of low-grade thermal energy
TL;DR: In this article, the authors proposed a traveling-wave thermoacoustic electricity generator, which employs a looped-tube travelling-wave engine to convert thermal energy into acoustic power, an ultra-compliant alternator within the engine loop to extract and convert the engine acoustic power to electricity, and an acoustic stub matching technique to match the alternator to the engine.
References
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Book ChapterDOI
Dynamic Experimental Study of the Multi-Bypass Pulse Tube Refrigerator with Two-Bypass Tubes
Yonglin Ju,Chengtao Wang,Y. Zhou +2 more
TL;DR: In this paper, a dynamic experimental apparatus has been constructed to investigate the instantaneous velocity and pressure in the multi-bypass pulse tube refrigerator (MPTR), and the effects of the middle-pass version on the dynamic pressure and mass flow rate at the cold end of the pulse tube are evaluated from experimental measurements.
Dynamic Experimental Study of a Multi—bypass Pulse Tube Refrigerator with Two—bypass Tubes
YonglinJu,ChaoWang +1 more
TL;DR: In this paper, a dynamic experimental apparatus to measure the instantaneous velocity and pressure in the multibypass pulse tube refrigerator (MPTR) was designed and constructed, and the effects of the middle-bypass version on the dynamic pressure and mass flow rate at the cold end of the pulse tube were evaluated.