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EXPERIMENTAL INVESTIGATION ON VORTEX BREAKDOWN IN SPIN-UP AND SPIN-DOWN PROCESSES VIA PIV

Journal of Hydrodynamics 2003年第2期15卷 58-63页

作者： LiuYing-zheng koyamahides. ChenHan-ping DepartmentofPowerMachineryEngineering ShanghaiJiaotongUniversityShanghai200030China DepartmentofMechanicalEngineering TokyoDenkiUniversityTokyo101-8457Japan

The whole field measurements of swirling flow in spin-up and spin-downprocesses via PIV are presented in the paper. Investigation of the flow patterns at H/R = 1. 50 wasexperimentally carried out for the first time in both processes. By means of symmetry analysis, itis found that the overall flow structure in the spin-up process still keep axi-symmetric to a greatextent, but deteriorated very fast in the spin-down process. The time to settle to the state of restin the spin-down process is found to be greatly shorter than the time to achieve the steady statein the spin-up process. Temporarily oscillatory vortex breakdown was discovered during the spin-upprocess, although no breakdown in the steady state at the same Reynolds number is found in preciousresearches.

关键词： vortex breakdown PIV swirling flow

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3D FLOW INSIDE BUBBLE-TYPE VORTEX BREAKDOWN: AN EXPERIMENTAL INVESTIGATION VIA LDV

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Journal of Hydrodynamics 2003年第3期15卷 44-48页

作者： LiuYing-zheng ChenHan-ping koyamahides SchoolofPowerandEnergyEngineering ShanghaiJiaotongUniversityShanzhai200030China DepartmentofMechanicalEngineering TokyoDenkiUniversityTokyo101-8457Japan

Bubble-type vortex breakdown of the swirling flow inside a closed cylindricalcontainer with a rotating upper endwall was experimentally investigated via LDV. 3D measurement ofthe steady bubble at H/R =1.5 was firstly carried out with very fine grid arrangement. Flow detailsinside the bubble and its Re -dependent structure were made clear. Abrupt waves of the azimuthalvelocity component were always found to be between the bottom stationary endwall and the upstreamstagnation point, which might be the reason of bubble formation. Variation of bubble structure andbubble center with the increasing Re gives the explanation for the disappearance of the breakdownregion.

关键词： bubble-type vortex breakdown LDV swirling flow

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