Abstract
The effects of Reynolds number (Re) and surface roughness on the wind pressure coefficient on a MAN type dry gas tank were analyzed in detail by wind tunnel tests. A wind load calculation model was then established, which is suitable for the wind resistant design of the gas tanks. The test results revealed that in the range of 7 × 105 < Re < 1.0 × 106 (supercritical regimes), the drag coefficient (Cd) and wind pressure coefficient remained constant, consistent with 2D cylinders in a uniform flow. However, in common with 2D cylinder flows, the surface roughness with the spacing ratio (λ) greater than 0.9 had a significant effect on the wind pressures coefficient. The minimum pressure coefficient (Cpmin) sharply increased from −2.3 to −0.65 with increasing surface roughness. The corresponding angle for the minimum pressure coefficient θmin was in between 140°and 90°, which was in a gradual decreasing trend with the increase in surface roughness of the model. The calculation method of the wind pressure coefficient with vary surface roughness was proposed, based on which, the calculation results were in good agreement with the test data.
Highlights
Gas tank is an important industrial structure. is structure is mainly made up of tank dome, cylindrical cabinet, internal piston, and supporting members
Drag Coefficient Cd. e drag coefficient of each measurement layer of the gas tank was obtained by weighted averaging the wind pressure data of each measurement point: Height (m) Height (m)
In order to further analyze the effect of the Reynolds number on Cd, the Cd of the gas tank model with the smooth surface in Type A flow field are shown in Figure 8(b) and the results were compared with those obtained by Cheng et al [26]
Summary
Gas tank is an important industrial structure. is structure is mainly made up of tank dome, cylindrical cabinet, internal piston, and supporting members. The gas tank is a simple circular cross-section structure When it comes to aerodynamics, simple circular cross-section always brings a complex behavior [1], as the features of flow separation strongly depend on Reynolds number. E aerodynamics of circular cylinders is characterized by abrupt transitions in the flow pattern and in the force parameters, depending only on Reynolds number and defining the aerodynamic regimes. Taylor [9] first reported the average pressure distribution on the surface of a cylinder in the TrBL state. Cantwell [11] repeated the average pressure distribution measurements test in TrBL states. E test results show that the minimum pressure coefficient decreases sharply with the increase of the Reynolds number. Due to the breakdown of separated bubbles, the Advances in Civil Engineering
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