三角タブを用いたガスタービン翼の膜冷却効率の向上 Improvement of a Cooling Effectiveness by the Use of a Delta-Tab

This paper describes the effects of a delta-tab on the film cooling effectiveness. The wall-jet is injected streamwisely and laterally into a two-dimensional turbulent boundary layer. A small delta-tab is installed at the edge of the injection hole exit. The mass flux ratio of the wall-jet to the main stream is set at 0.5,0.85 and 1.2 in streamwise injection, and at 0.5 and 1.2 in lateral injection. An encapsulated temperature-sensitive liquid crystal is used to measure the temperature distribution on the surface. Upstream-tab in streamwise injection prevents the primary stream from convoluting in the downstream region. The total cooling effectiveness in streamwise injection with a upstream-tab is larger than that in the spanwise injection at downstream.