| Cooling performance measurements have been made of non-adiabatic laser drilled effusion cooled test plates, using infrared thermography. Mainstream air at 85°C, and ambient temperature cooling air were delivered to alternate sides of a test plate, using a test rig provided by Pratt & Whitney Canada. The test section was equipped with a zinc sulphide window that provided infrared access to the surface of the test plates so that plate surface temperatures could be measured using an infrared thermal imager. Several different imagers were used over the course of this study, with the final plate temperature data being obtained with the ThermaCAM PM 290, an internally cooled platinum silicide focal plane array detector.;Using both steady state and transient tests, hole discharge coefficients, overall cooling effectiveness (i.e. dimensionless plate temperature), and overall heat transfer coefficients were obtained and presented. The series of effusion cooled test plates were constructed so as to examine the effect of hole density (i.e. number of holes per surface area), hole diameter, and hole inclination angle. Hole densities ranged between 5 and 8 holes per cm 2, hole diameters ranged between 0.5 and 0.85 mm, and hole inclination angles ranged between 18 and 30 degrees from the stream wise direction.;Results demonstrate that effusion cooling performance is largely dominated by in-hole heat transfer. Test plates that possess large in-hole surface areas, relative to plate surface area, were found to experience higher cooling effectiveness. Consequently, increasing the hole density, increasing the hole diameter, and decreasing the inclination angle served to increase cooling performance, with hole density being the parameter having the largest effect.;Recommendations are proposed for future work that pertain to: obtaining better similarity between actual and test conditions, obtaining better instrument calibration procedures, and obtaining more complete heat transfer coefficient data. |
