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۱Experimental and Numerical Analysis of Turbulent Air Flow Around a Surface Mounted Hemisphere
نویسنده(ها): ،
اطلاعات انتشار: Scientia Iranica، هفدهم،شماره۶، ۲۰۱۰، سال
تعداد صفحات: ۱۲
The air ow field around a surface mounted hemisphere for different velocities is investigated experimentally and numerically. Hot–film anemometry is used in a wind tunnel to analyze the ow structure for different regions of ow domain around the hemisphere. The ow Reynolds number is varied based on the hemisphere diameter and free stream velocities. The air velocity is taken as 5, 7 and 8.5 m\s, with corresponding Reynolds numbers of 35000, 50000 and 64000. To illustrate the ow pattern around the hemisphere, variations of ow velocity at various vertical sections along the midplane, and cross–stream velocities for various surfaces and heights, are measured and plotted. Corresponding numerical solutions are also carried out to visualize the ow reversal, horseshoe vortices and recirculation zones around and downstream of the hemisphere. It is concluded that the ow is highly Reynolds number dependent, especially at the reversed ow region upstream and downstream of the hemisphere. Moreover, the e ect of hemisphere location in the tunnel is studied, and velocity distributions are compared and presented in the wake of the hemisphere for constant free stream velocity.
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