Effects of Rectangular Trench and Inclined Hole Geometry on Film Cooling Flow and Heat Transfer Characteristics

Regarding the cooling structure of gas turbine combustors, this paper employs numerical simulation methods to analyze the influence of structural parameters of a rectangular trench with inclined holes on flow and heat transfer characteristics at a coolant-side Reynolds number of 100,000. The results indicate that with a decrease in the width of the rectangular trench and an increase in the diameter of the inclined holes, the coolant-side friction factor gradually decreases. The coolant-side friction factor at a streamwise distance of Y/D = 30 is lower than that at Y/D = 20 and 40. With an increase in the diameter of the inclined holes, the average coolant-side Nusselt number exhibits a greater increase, indicating significantly enhanced heat transfer effectiveness. The average coolant-side Nusselt number at a streamwise distance of Y/D = 40 is higher than that at Y/D = 20 and 30. Furthermore, with an increase in the diameter of the inclined holes and a decrease in the streamwise distance, the average temperature of the solid wall on the hot-gas side gradually decreases, leading to a progressive improvement in cooling efficiency.