عنوان مقاله [English]
Study of vortex shedding and flow downstream of a triangular bluff body can be used to design a device for measuring the flow angle, a vortex flowmeter or to calibrate the hot-wire anemometer at low velocities. In this paper, flow velocity, turbulence intensity, and vortex shedding from a 10 mm triangular bluff body have been investigated experimentally using hot-wire anemometer. Results show that the flow angle has little effect on flow velocity distribution and turbulence intensity. However, variations of Strouhal number (St) with respect to the flow angle is large, so that Strouhal number at flow angle of 20 ° has the maximum value of 0.23 and at the angle of 62 °, it has the minimum value of 0.133. To calibrate the hot-wire anemometer, it is necessary to measure flow velocity in addition to the measurement of vortex shedding. Under this condition, if the probe is placed in the region: x/a=2.5 and 2.5<y/a<5.2, vortex intensity will be less than 6%, the velocity will be equal to the free stream velocity, and the vortices will be measurable.