Details

Autor(en) / Beteiligte

• Sarioglu, Mustafa
• Akansu, Yahya Erkan
• Yavuz, Tahir

Titel

Control of the Flow Around Square Cylinders at Incidence by Using a Rod

Ist Teil von

• AIAA journal, 2005-07, Vol.43 (7), p.1419-1426

Ort / Verlag

Reston, VA: American Institute of Aeronautics and Astronautics

Erscheinungsjahr

2005

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Aerodynamic characteristics of a square cylinder at incidence were investigated experimentally in the wake of a small rod at a Reynolds number of 3.4 X 104. The dimensionless gap L/D was varied from 1.71 to 8.00. Depending on the spacing L/D, two flow patterns with and without vortex shedding from the rod were observed. Pressure measurements on the rod and square cylinder and hot-film measurements in the wake of the cylinder were carried out. The combined influences of the rod and angle of incidence on the pressure distributions and vortex-shedding phenomenon were investigated. Without the rod, as the incidence increases from 0 deg, the reattachment on the lower side surface of the square cylinder occurs at the vicinity of 13 deg, and this corresponds to a jump in the Strouhal number. However, when the rod was set upstream of the square cylinder, the reattachment occurs at smaller angles of incidence depending on L/D. At zero angle of incidence, the minimum value of drag on the square cylinder is obtained for L/D= 2.0 and produces a drag that is 30% that of the square cylinder without rod. For L/D= 1.71, with increasing the angle of incidence CD values approximate to those of the square cylinder without rod. In the case of L/D greater than or equal to C 2.7, there is a considerable decrease in CD in the region theta less than or equal to 10 deg; however, the effect of the rod on CD decreases beyond theta=10 deg.[PUBLICATION ABSTRACT]