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Research Papers

Numerical Study of Multistage Serial and Parallel Configurations of Thermoacoustic Engines

[+] Author and Article Information
Adnan Poshtkouhian Badi

Department of Mechanical Engineering,
Faculty of Engineering,
University of Isfahan,
Hezar Jarib Avenue,
Isfahan 81746-73441, Iran
e-mail: Adnan.p.badi@gmail.com

Hamid Beheshti

Department of Mechanical Engineering,
Faculty of Engineering,
University of Isfahan,
Hezar Jarib Avenue,
Isfahan 81746-73441, Iran
e-mail: Hamid.beheshti@eng.ui.ac.ir

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received September 29, 2015; final manuscript received February 6, 2016; published online March 8, 2016. Assoc. Editor: Giulio Lorenzini.

J. Thermal Sci. Eng. Appl 8(2), 021025 (Mar 08, 2016) (6 pages) Paper No: TSEA-15-1278; doi: 10.1115/1.4032710 History: Received September 29, 2015; Revised February 06, 2016

The focus of this study is on serial and parallel configurations of a multistage thermoacoustic engines (TAE). Thermoacoustics integrates fluid dynamics, thermodynamics, and acoustics to explain the interactions existing between heat and sound. Considerable amounts of waste heat are released to the environment in everyday industrial processes. This waste heat cannot be reused due to its low temperature. One way for reusing some of this waste heat is to employ a thermoacoustic heat pump. TAEs can be driven by waste heat and are capable of supplying the power to drive the thermoacoustic heat pumps. However, due to the low temperature of this waste heat, single-stage TAEs cannot provide the required temperature lifts. Multistage TAEs are advantageous because they can provide sufficient temperature lifts. In this study, a computational fluid dynamics (CFD) simulation is carried out to understand the conversion process of heat to sound and study the nonlinear conjugation of unsteady heat release and acoustic disturbances. The two main parameters evaluated in this simulation are the initial pressure disturbance and the stack's temperature gradient. Their effects on actuating limit cycle oscillations are examined in a 2D numerical model. The numerical simulation results indicate that the pressure amplitude varies through alteration made in these mentioned parameters. The present numerical results are validated by previously published data.

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References

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Figures

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Fig. 1

Schematic of a single-stage TAE

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Fig. 2

Schematic of a serial TAE

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Fig. 3

Schematic of a parallel TAE

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Fig. 4

Structure of the mesh in the stack region of: (a) serial TAE and (b) parallel TAE

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Fig. 5

Pressure amplitude at closed end of the single-stage TAE

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Fig. 6

Effect of initial pressure disturbance on thermoacoustic oscillations: (a) at closed end of serial TAE and (b) at left closed end of parallel TAE

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Fig. 7

Oscillating pressure and heat flux from the left core of parallel TAE: (a) at first limit-cycle and (b) at second limit-cycle

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Fig. 8

Effect of stack's temperature gradient on thermoacoustic oscillations: (a) at closed end of serial TAE and (b) at left closed end of parallel TAE

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Fig. 9

Acoustic pressure distribution along the length of the TAE: (a) serial TAE and (b) parallel TAE

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Fig. 10

Acoustic velocity distribution along the length of the TAE: (a) serial TAE and (b) parallel TAE

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