Multiple-channel inlet design is commonly used in artificial ocean basins for improving the uniformity of current flows in horizontal direction, as well as for the generation of uniform or sheared currents in vertical direction. However, boundary layers developing along the walls between the channels result in lower velocities after the fluid leaves the ducts and enters the basin, which is undesired. To reduce the effects of the boundary layers and increase the flow uniformity at the basin inlet, the present work aims to improve the inlet design. Experimental study are performed in a wind tunnel at wind velocity of 20 m/s. To simulate the walls, a Perspex plate with thickness of 20mm is fixed at the center of wind tunnel test section. A triangle end tip with tip angle of 7° is attached to the training edge of the plate. Four configurations of honeycombs are applied to study the effects of honeycombs on the flow uniformity. Among the four configurations, honeycomb with thickness t = 50 mm and cell size dg = 5 mm is used as bench mark case. In the second and third configurations, the thickness of vertical central 80mm region is reduced to be 25 mm. In the fourth configuration, the central region is then replaced by honeycomb with thickness of 50mm, but with cell size of 10mm. The experimental results show the possibility to eliminate the lower velocity region by using shaped honeycomb or honeycomb with various cell sizes. With the experimental results as validation, the honeycomb configuration is then optimized using numerical simulation with OpenFoam.
Combined Experimental and Numerical Studies of Multi-Channel Inlet Design for Ocean Basin
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Zheng, Y, Magee, AR, Tuyen Le, Q, & Dao, MH. "Combined Experimental and Numerical Studies of Multi-Channel Inlet Design for Ocean Basin." Proceedings of the ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. Volume 1: Offshore Technology. Trondheim, Norway. June 25–30, 2017. V001T01A047. ASME. https://doi.org/10.1115/OMAE2017-61672
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