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Archive of Mechanical Engineering

The Journal of Committee on Machine Building of Polish Academy of Sciences

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2300-1895
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Stack Parameters Effect on the Performance of Anharmonic Resonator Thermoacoustic Heat Engine

Mostafa A. Nouh
  • Department of Physics, The American University in Cairo, P.O. Box 74 New Cairo 11835, Cairo, Egypt
  • Email:
/ Nadim M. Arafa
  • Department of Physics, The American University in Cairo, P.O. Box 74 New Cairo 11835, Cairo, Egypt
/ Ehab Abdel-Rahman
  • Department of Physics, The American University in Cairo, P.O. Box 74 New Cairo 11835, Cairo, Egypt
  • The Yousef Jameel Science and Technology Research Center, The American University in Cairo, P.O. Box 74 New Cairo 11835, Cairo, Egypt
Published Online: 2014-05-17 | DOI: https://doi.org/10.2478/meceng-2014-0006

Abstract

A thermoacoustic heat engine (TAHE) converts heat into acoustic power with no moving parts. It exhibits several advantages over traditional engines, such as simple design, stable functionality, and environment-friendly working gas. In order to further improve the performance of TAHE, stack parameters need to be optimized. Stack’s position, length and plate spacing are the three main parameters that have been investigated in this study. Stack’s position dictates both the efficiency and the maximum produced acoustic power of the heat engine. Positioning the stack closer to the pressure anti-node might ensure high efficiency on the expense of the maximum produced acoustic power. It is noticed that the TAHE efficiency can further be improved by spacing the plates of the stack at a value of 2.4 of the thermal penetration depth, ςk . Changes in the stack length will not affect the efficiency much as long as the temperature gradient across the stack, as a ratio of the critical temperature gradient Γ, is more than 1. Upon interpreting the effect of these variations, attempts are made towards reaching the engine’s most powerful operating point.

Streszczenie

Termoakustyczna maszyna cieplna (TAHE) przekształca ciepło w energie akustyczna bez uzycia czesci ruchomych. W porównaniu z maszynami tradycyjnymi ma ona szereg zalet, takich jak prosta konstrukcja, stabilnosc działania oraz wykorzystanie gazów przyjaznych dla srodowiska. W celu dalszej poprawy osiagów maszyny TAHE nalezy zoptymalizowac parametry stosu (zespołu waskich kanałów miedzy płytami wymiennika ciepła). Trzema głównymi parametrami analizowanymi w przedstawionej pracy sa pozycja stosu, długosc i odstep miedzy płytami. Pozycja stosu decyduje zarówno o sprawnosci jak maksymalnej mocy akustycznej wytwarzanej przez maszyne cieplna. Umieszczenie stosu blizej strzałki fali stojacej moze zapewnic wieksza sprawnosc kosztem maksymalnej wytwarzanej mocy akustycznej. Stwierdzono, ze dalsza poprawa sprawnosci maszyny TAHE moze byc osiagnieta gdy zastosuje sie odstep płyt stosu równy 2,4 cieplnej głebokosci wnikania, k . Zmiany długosci stosu nie maja wielkiego wpływu na sprawnosc tak długo, jak stosunek krytycznego gradientu cieplnego jest wiekszy od 1. Na podstawie interpretacji efektów tych zmian podjeto wysiłki dla uzyskania najlepszych osiagów maszyny.

Keywords : thermoacoustic; stack; anharmonic; resonator; engine; optimization

References

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About the article

Received: 2013-10-02

Published Online: 2014-05-17

Published in Print: 2014-03-01


Citation Information: Archive of Mechanical Engineering, ISSN (Online) 2300-1895, DOI: https://doi.org/10.2478/meceng-2014-0006.

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© by Mostafa A. Nouh. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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