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자료유형
학술저널
저자정보
Martinez-Vazquez, P. (School of Civil Engineering, University of Birmingham) Baker, C.J. (School of Civil Engineering, University of Birmingham) Sterling, M. (School of Civil Engineering, University of Birmingham) Quinn, A. (School of Civil Engineering, University of Birmingham) Richards, P.J. (Department of Mechanical Engineering University of Auckland)
저널정보
테크노프레스 Wind & structures Wind & structures 제13권 제2호
발행연도
2010.1
수록면
127 - 144 (18page)

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Pressure measurements on static and autorotating flat plates have been recently reported by Lin et al. (2006), Holmes, et al. (2006), and Richards, et al. (2008), amongst others. In general, the variation of the normal force with respect to the angle of attack appears to stall in the mid attack angle range with a large scale separation in the wake. To date however, no surface pressures have been measured on auto-rotating plates that are typical of a certain class of debris. This paper presents the results of an experiment to measure the aerodynamic forces on a flat plate held stationary at different angles to the flow and allowing the plate to auto-rotate. The forces were determined through the measurement of differential pressures on either side of the plate with internally mounted pressure transducers and data logging systems. Results are presented for surface pressure distributions and overall integrated forces and moments on the plates in coefficient form. Computed static force coefficients show the stall effect at the mid range angle of attack and some variation for different Reynolds numbers. Normal forces determined from autorotational experiments are higher than the static values at most pitch angles over a cycle. The resulting moment coefficient does not compare well with current analytical formulations which suggest the existence of a flow mechanism that cannot be completely described through static tests.

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