Analysis of mist/air film cooling performance of trenched holes with shaped lips

Mist-assisted film cooling has exhibited great potential for efficient of a turbine blade. Trench structures can significantly affect the performance air, while their impact on adhesion characteristics droplets and thus mist-assisted is unclear. This work highlights combination these two aspects by exploring improvement trenched holes with shaped lips using three-dimensional computations. The results show that upper lip structure plays significant role in adiabatic effectiveness, whereas lower little effect it. It found effectiveness increases increasing blowing ratio; Coanda makes more attached to wall fillet bevel structure. Meanwhile, concentration mist diameter are crucial improving effectiveness. In general, better values observed both 10 ?m at specified larger droplet size. proposes novel means enhancing mist/air mixture lips.