The boundary layer velocity measurements in a high-amplitude standing wave thermoacoustic stack

Xiaoan Mao, Artur J. Jaworski, Lei Shi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this study, the hot-wire anemometry is used to investigate the high-amplitude velocity oscillations inside a parallel-plate stack of a standing-wave thermoacoustic resonator. The ratio of the peak acoustic pressure amplitude to the ambient pressure, defined as the drive ratio (Dr), ranges from 0.3 to 6.0%. The applicability of hot-wire anemometry technique for a time-resolved velocity measurement is studied, typically at a low Dr of 0.5%, in which the condition the flow is very likely to remain laminar. At higher drive ratios, turbulent bursts start to be generated and the velocity waveform becomes strongly fluctuating. By comparing the velocity fluctuations measured in different regions of the viscous boundary layer, the transition behaviour is analyzed. The importance of this study lies in developing reliable measurement techniques for use in thermoacoustic systems and a critical analysis of the capabilities of the hot-wire anemometry in particular.
LanguageEnglish
Title of host publicationProceedings of the 22nd IIR International Congress of Refrigeration (ICR 2007)
Number of pages8
ISBN (Electronic)9782913149595
Publication statusPublished - 21 Aug 2007
Externally publishedYes

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velocity measurement
standing waves
boundary layers
wire
parallel plates
bursts
waveforms
resonators
oscillations
acoustics

Cite this

Mao, X., Jaworski, A. J., & Shi, L. (2007). The boundary layer velocity measurements in a high-amplitude standing wave thermoacoustic stack. In Proceedings of the 22nd IIR International Congress of Refrigeration (ICR 2007) [ICR07-A1-281]
Mao, Xiaoan ; Jaworski, Artur J. ; Shi, Lei. / The boundary layer velocity measurements in a high-amplitude standing wave thermoacoustic stack. Proceedings of the 22nd IIR International Congress of Refrigeration (ICR 2007). 2007.
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abstract = "In this study, the hot-wire anemometry is used to investigate the high-amplitude velocity oscillations inside a parallel-plate stack of a standing-wave thermoacoustic resonator. The ratio of the peak acoustic pressure amplitude to the ambient pressure, defined as the drive ratio (Dr), ranges from 0.3 to 6.0{\%}. The applicability of hot-wire anemometry technique for a time-resolved velocity measurement is studied, typically at a low Dr of 0.5{\%}, in which the condition the flow is very likely to remain laminar. At higher drive ratios, turbulent bursts start to be generated and the velocity waveform becomes strongly fluctuating. By comparing the velocity fluctuations measured in different regions of the viscous boundary layer, the transition behaviour is analyzed. The importance of this study lies in developing reliable measurement techniques for use in thermoacoustic systems and a critical analysis of the capabilities of the hot-wire anemometry in particular.",
keywords = "thermoacoustics, measurement, velocity (fluid, gases), wave, boundary layer, packing",
author = "Xiaoan Mao and Jaworski, {Artur J.} and Lei Shi",
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Mao, X, Jaworski, AJ & Shi, L 2007, The boundary layer velocity measurements in a high-amplitude standing wave thermoacoustic stack. in Proceedings of the 22nd IIR International Congress of Refrigeration (ICR 2007)., ICR07-A1-281.

The boundary layer velocity measurements in a high-amplitude standing wave thermoacoustic stack. / Mao, Xiaoan; Jaworski, Artur J.; Shi, Lei.

Proceedings of the 22nd IIR International Congress of Refrigeration (ICR 2007). 2007. ICR07-A1-281.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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N2 - In this study, the hot-wire anemometry is used to investigate the high-amplitude velocity oscillations inside a parallel-plate stack of a standing-wave thermoacoustic resonator. The ratio of the peak acoustic pressure amplitude to the ambient pressure, defined as the drive ratio (Dr), ranges from 0.3 to 6.0%. The applicability of hot-wire anemometry technique for a time-resolved velocity measurement is studied, typically at a low Dr of 0.5%, in which the condition the flow is very likely to remain laminar. At higher drive ratios, turbulent bursts start to be generated and the velocity waveform becomes strongly fluctuating. By comparing the velocity fluctuations measured in different regions of the viscous boundary layer, the transition behaviour is analyzed. The importance of this study lies in developing reliable measurement techniques for use in thermoacoustic systems and a critical analysis of the capabilities of the hot-wire anemometry in particular.

AB - In this study, the hot-wire anemometry is used to investigate the high-amplitude velocity oscillations inside a parallel-plate stack of a standing-wave thermoacoustic resonator. The ratio of the peak acoustic pressure amplitude to the ambient pressure, defined as the drive ratio (Dr), ranges from 0.3 to 6.0%. The applicability of hot-wire anemometry technique for a time-resolved velocity measurement is studied, typically at a low Dr of 0.5%, in which the condition the flow is very likely to remain laminar. At higher drive ratios, turbulent bursts start to be generated and the velocity waveform becomes strongly fluctuating. By comparing the velocity fluctuations measured in different regions of the viscous boundary layer, the transition behaviour is analyzed. The importance of this study lies in developing reliable measurement techniques for use in thermoacoustic systems and a critical analysis of the capabilities of the hot-wire anemometry in particular.

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Mao X, Jaworski AJ, Shi L. The boundary layer velocity measurements in a high-amplitude standing wave thermoacoustic stack. In Proceedings of the 22nd IIR International Congress of Refrigeration (ICR 2007). 2007. ICR07-A1-281