The flow over bluff bodies represents an importance and complex configuration that is interest for many engineering applications such as tall buildings, adjacent skyscrapers, and tubes bundles in heat exchangers, overhead power-line bundles, bridge piers, stays, masts, chemical reaction towers, off-shore platforms and electronic systems especially in computer equipment. In this research, the flow around a rectangular wall-mounted cylinder with limited height is studied experimentally by using wind tunnel and smoke tunnel. The height to smaller side of rectangular cylinder is 7. The rectangular cross-section aspect ratio is varied from 1 to 4 (AR=b/a=1, 2, 3, 4) and various incidence angles (0°–45°) has been tested. A low-speed vertical smoke tunnel is used to visualize flow patterns and determine the flow parameters such as the stagnation and separations points, separation angle, turbulence lengths of the shear layer, wake length, frequency and Strouhal number. The pressure coefficients (Cp) on the models’ faces are measured via sensors which are placed on theirs’ faces. Measuring velocity field, turbulence quantities and frequency are carried out using hot wire anemometry for various angles and aspect ratio. Experiments were performed in Isfahan University of Technology labs. The results show that there i a critical angle around ?=15° for square cylinder, where the Strouhal number becomes higher value due to the occurrence of the reattachment of the separated shear layer on the cylinder’s face. The results also show that there are three flow patterns when the aspect ratio is varied from 1 to 4. They are denoted as fully separated flow, secondary separated flow and fully reattached flow. It is observed that increase of the cylinder aspect ratio causes to decrease the critical value of Strouhal number and the wake width. It is founded that the Strouhal number reaches to its’s minimum value at AR=3 due to the occurrence of first reattachment flow on the cylinder’s side. In addition, it is found that by increasing the aspect ratio, the drag coefficient increases. Key Words: Rectangular wall-mounted Cylinder, Wind tunnel, Smoke tunnel, hot wire, Flow pattern, Pressure coefficient, Strouhal number, Incidence angles
