Internal Wall-Jet Film Cooling with Straight Cylindrical Holes

Abstract

of vortices created downstream of the coolant injection andthe jet exit momentum. It is observed that higher mixing of coolant with the mainstream and high vorticity levels negates the presence of more coolant availability at higher blowing ratios and results in an optimum blowing ratio for a given geometric configuration. Higher effectiveness is obtainedfortheconjugatewallsthroughoutthetestsectionexceptatregionsveryclosetothecoolantinjection. High conductive walls produced a negative heat flux condition immediately downstream of the coolant jet exit, indicating that a highly conductive wall is not a proper choice for internal wall-jet film-cooling applications. The results could provide useful input for analysis and optimization of straight cylindrical coolant holes.