Graduate Thesis Or Dissertation
 

On Primary Vortex Shedding Regimes between Long Tandem Plates

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/z603r361x

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  • Vortex shedding is a phenomenon relevant to any industry dealing with fluid flow. The shed vortices often produce oscillatory forces, which have been suspect in the catastrophic failure of airplanes and bridges alike. To prevent further engineering failures a better understanding of the underlying physics is needed. It has been well established that tandem plates exhibit different flow phenomena than cylinders, yet the study of the flow field around tandem plates is insufficient in providing a reasonable prediction of the Strouhal numbers for given geometry. This study fills the void in knowledge in three ways. First, it provides a review of the relevant literature related to vortex shedding for plates as well as that for cylinders, which have been well studied. Second, it develops the theory behind vortex shedding for plates through leveraging previous studies and applying a scaling analysis to the data. Third, it verifies the theory through a PIV analysis of various plate geometries. The results from the analysis are compared directly to the results of cylinders. The general plate has an l:b ratio of 20. Reynolds numbers (Reb) range from 150 (below which vortex shedding does not occur) to 1100 (the “constant” Strouhal limit of cylinders). Gap spacing ratios are taken from a value of zero to infinity. The results of the study provide a means of more accurately determining the Strouhal number for both single and tandem long plates.
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file details Howard_Trevor_K_2018.pdf 2018-07-06 公开 下载