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Acoustic waves generated by a TA (ThermoAcoustic) laser pair

Author

Listed:
  • Chun, Wongee
  • Oh, Seung Jin
  • Lee, Yoon Joon
  • Lim, Sang Hoon
  • Surathu, Rohit
  • Chen, Kuan

Abstract

Sound waves and acoustic energy generated by two identical TA (ThermoAcoustic) lasers were analyzed and studied. SPL (Sound Pressure Level) meters and microphones were employed to measure and study the sound waves at different distances from the openings of the TA laser pair for different laser position arrangements. The sound waves of the two TA lasers at or near the focusing point were found to be almost 180° out of phase when the distance between the openings of the two lasers was within about two tube diameters and the angle between the laser axes did not exceed 135°. As the distance increased, it became difficult to control the two TA lasers in synchronized operation. For separation distances greater than three times tube diameter, the sound wave amplitudes and the phase difference between the two laser outputs varied periodically with time. With the openings of the two TA lasers touching each other, the frequency of the sound waves increased when the angle between the laser axes was very close to 180°. In this case, the glass tube opening was no longer a pressure anti-node and the wavelength of the fundamental mode reduced to approximately twice the tube length.

Suggested Citation

  • Chun, Wongee & Oh, Seung Jin & Lee, Yoon Joon & Lim, Sang Hoon & Surathu, Rohit & Chen, Kuan, 2012. "Acoustic waves generated by a TA (ThermoAcoustic) laser pair," Energy, Elsevier, vol. 45(1), pages 541-545.
    • Handle: RePEc:eee:energy:v:45:y:2012:i:1:p:541-545
    DOI: 10.1016/j.energy.2012.02.047
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    References listed on IDEAS

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    Cited by:

    1. Chen, Geng & Tang, Lihua & Mace, Brian & Yu, Zhibin, 2021. "Multi-physics coupling in thermoacoustic devices: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 146(C).
    2. Sun, Daming & Xu, Ya & Chen, Haijun & Shen, Qie & Zhang, Xuejun & Qiu, Limin, 2013. "Acoustic characteristics of a mean flow acoustic engine capable of wind energy harvesting: Effect of resonator tube length," Energy, Elsevier, vol. 55(C), pages 361-368.
    3. Zhang, Zhiguo & Zhao, Dan & Li, S.H. & Ji, C.Z. & Li, X.Y. & Li, J.W., 2015. "Transient energy growth of acoustic disturbances in triggering self-sustained thermoacoustic oscillations," Energy, Elsevier, vol. 82(C), pages 370-381.
    4. Li, Xinyan & Zhao, Dan & Yang, Xinglin, 2017. "Experimental and theoretical bifurcation study of a nonlinear standing-wave thermoacoustic system," Energy, Elsevier, vol. 135(C), pages 553-562.
    5. Zhao, Dan & Ji, Chenzhen & Li, Shihuai & Li, Junwei, 2014. "Thermodynamic measurement and analysis of dual-temperature thermoacoustic oscillations for energy harvesting application," Energy, Elsevier, vol. 65(C), pages 517-526.
    6. Wang, Kai & Sun, Daming & Xu, Ya & Zou, Jiang & Zhang, Xiaobin & Qiu, Limin, 2014. "Operating characteristics of thermoacoustic compression based on alternating to direct gas flow conversion," Energy, Elsevier, vol. 75(C), pages 338-348.
    7. Zhao, Dan & Ji, Chenzhen & Teo, C. & Li, Shihuai, 2014. "Performance of small-scale bladeless electromagnetic energy harvesters driven by water or air," Energy, Elsevier, vol. 74(C), pages 99-108.

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