S-Bend Diffuser With Passive Effusion Cooling

This paper presents the results of an experimental study of passive effusion cooling in an S-bend channel with a diffuser. A previous paper showed the results for cold primary flow [1]. This paper deals with hot primary flow. The results show that different levels and locations of effusion injection significantly affect the primary flow field and the pressure recovery in the downstream diffuser. This leads to a significant increase in static pressure at the inlet of the S-bend section, and reduces the driving pressure for the passive effusion cooling air. This effect then leads to reduced effusion mass flow, momentum and cooling effectiveness. The paper presents data on the static pressure distributions in the device, flow distortion at the diffuser exit, flow rate of effusion injection, and effusion cooling effectiveness.