1. Reynolds number effects on wind pressure distributions of 2D rectangular prisms in low turbulence flow.
- Author
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WANG Xinrong, GU Ming, and QUAN Yong
- Subjects
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WIND pressure , *REYNOLDS number , *MATHEMATICAL models of turbulence , *WIND tunnels , *AERODYNAMIC load , *MATHEMATICAL models - Abstract
Experiments on the rectangular prisms with side ratios of 2. 0, 2.5, 3.0, 3.5 and 4. 0 are reported. Wind pressure measurements were carried out on five rectangular prisms for the testing Reynolds number Re ranging from l. 1 x 105 to 6. 8 x 105. The Reynolds number effects on the wind pressure distributions and the base pressure coefficients were studied, then the mechanisms of Reynolds number effects on rectangular prisms were described by analyzing the variation of the flow around the model. The results are summarized as follows; wind pressure distributions of five rectangular prisms are all sensitive to Re, and the Reynolds number affects the wind pressure distributions not only in the reattachment region, but also in the separation bubble. The sensitivity to the Reynolds number effects is changed with the side ratio of the rectangular prism, and the B/D = 4 .0 rectangular prism appears to be the most sensitive to the Re. Its separated shear layer is easier to reattach to the body at high Re, and the flow reattachment point moves towards the leading edge suddenly at the critical Re = 6. 8 x 105. In addition, with the increasing of Re, the absolute value of base pressure coefficient for the B/D =4. 0 prism increases firstly, and then decreases rapidly. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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