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《ACTA MECHANICA SINICA》 1998-01
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PRELIMINARY INVESTIGATION OF PARTICLE IMAGE VELOCIMETRY (PTV-PIV) TECHNIQUE IN TWO-PHASE FLOW

Wang Xilin Zhang Dali * Chang Zhe He Song * (Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China) *(Department of Automation, Tsinghua University,Beijing 100084, China)  
On the basis of the single phase PTV-PIV investigation, solid-liquid two phase flow field particle image velocimetry technique was studied in this paper. Specially processed Al 2 O 3 powder of 5 μ m was taken as liquid phase tracer, millet of 1.5mm in diameter and 1.265kg/m 3 of density was taken as particle tracer. They were scattered in the circulating water channel to form the experimental two phase flow field. Laser sheet was obtained by using a 45mW He-Ne laser source and a series of mirrors and lenses to illuminate the flow field,two external synchronization CCD cameras were used to get the flow field frames through optical lenses. The starting time interval between the two CCD cameras from the same flow domain were collected into a PC586 through a frame grabber board. The two phase frames were discriminated and relative data was processed by software, and the two phase flow velocity distribution near the boundary layer was obtained. This paper emphasizes the study of the difference between two phase PTV-PIV sampling technique and single phase PIV-PTV technique, and discusses the effect of density difference between tracer particles, the effect of optical property difference to measurement,and the compatible criterion of the two-phase velocities in velocity sampling. These studies pave the way for the further study of two phase particle image velocimetry technique.
【Fund】: 煤的清洁燃烧技术国家重点实验室、清华大学科学基金 国家自然科学基金
【CateGory Index】: O359
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