The Effect of Shaping Inclined Slots on Film Cooling Effectiveness and Heat Transfer Coefficient
The objective of this paper is to evaluate the performance of two inclined slot jets when used in a film cooling application. The coolant gas was injected onto a flat plate in a subsonic wind tunnel. The two geometries used are a 35° inclined slot and a shaped 35° inclined slot. A density ratio of 1.55 was created by using foreign gas (carbon dioxide) injection. In order to determine heat transfer, a thin stainless steel foil was used as a resistance heater to create a constant heat flux. Using a transient method, the heat transfer coefficient was calculated downstream of the two-dimensional slots. In addition, the adiabatic effectiveness was measured. Shaping the slot improves overall performance, with an increased effectiveness and a slight reduction in heat transfer coefficient, particularly far downstream of the slot.