Gasturbines@SNU

  The roughness-induced profile loss in gas, steam, and wind turbines are induced by increased thickness of boundary layers over the blade surface. In the meantime, the growth of the boundary layer is also affected by pressure gradient. This fundamental investigation is being conducted to clarify the combined effects of the roughness and pressure gradients on the turbulent boundary layer characteristics- boundary layer thickness, displacement thickness and momentum thickness; shape factor and skin friction distribution; time-mean velocity profile and turbulent intensity distribution. The experiments have been carried out using a flat plate test facility with two different types of pressure gradients, favorable pressure gradients (FPG) and adverse pressure gradients (APG).