Drag reduction of an object is the major concern in many engineering applications. Experimental studies have been carried out on circular cylinder with helical grooves in a subsonic wind tunnel. Different cases of helical grooves with different pitches, helical groove angles and number of starts of helical groove on circular cylinder are tested. Experimental results show the drag coefficient is...

We present an experimental and numerical study of the flow downstream honeycomb straighteners for a range Reynolds numbers, covering both laminar turbulent inside cells. carried out experiments with planar particle image velocimetry (PIV) in wind tunnel performed simulations to perform in-depth investigation three-dimensional field. The individual channel profiles gradually develop into one uni...