THE BOUNDARY LAYER VELOCITY MEASUREMENTS IN A HIGH-AMPLITUDE STANDING WAVE THERMOACOUSTIC STACK
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.
X.A.MAO A.J.JAWORSKI L.SHI
School of Mechanical, Aerospace and Civil Engineering (George Begg Building), The University of Manchester, P.O. Box 88, Sackville Street, Manchester M60 1QD, UK
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）