Experimental study of subsonic film cooling performance in aircraft engine gas turbine blades via thermal paint, Laser Doppler Anemometry (LDA) and thermal wind tunnel techniques

Beg, OA; Daud, HA; Beg, TA; Kadir, A; Leonard, HJ; Malysheva, LI

Abstract

The present study employs thermal paint technology (TPT) to investigate the performance of holes arrays on gas turbine film cooling. Detailed tests have been performed to study the influence of blowing ratio (BR) and angle of injection on realistic gas turbine blade specimens with the aid of a thermal wind tunnel (TWT). Three gas turbine blade specimens have been fabricated using Laser Sintering Technology (LST) with angles of injection 350, 450 and 600. On each of these specimens a leading edge a column of 21 holes has been incorporated on each side of the turbine blade with 0.5 mm diameters and lateral pitch spacing of pitch equal to 5*diameters. Cooling air effects have been studied with increasing injection rates (BR=600, 800 and 1000 cm3/min). The results for film cooling performance indicate that a marked enhancement is achieved by increasing BR and that there is a significant decrease in blade surface temperature. Furthermore, greater cooling has been demonstrated for the pressure side of the blade specimens, resulting in extended protection areas along the spanwise direction from the hub to the shroud. TPT has shown that improved blade protection is achieved (purple colour) for a 450 angle of injection. Thermal paint technology KN5 is found to be a dependable methodology for determining blade surface temperature distribution and works efficiently at high temperature.

Citation

Beg, O., Daud, H., Beg, T., Kadir, A., Leonard, H., & Malysheva, L. Experimental study of subsonic film cooling performance in aircraft engine gas turbine blades via thermal paint, Laser Doppler Anemometry (LDA) and thermal wind tunnel techniques. Presented at ICFMA 2022: 16th International Conference on Fluid Mechanics and Applications, Lisbon, Portugal

• Presentation Conference Type: Other
• Conference Name: ICFMA 2022: 16th International Conference on Fluid Mechanics and Applications
• Conference Location: Lisbon, Portugal
• End Date: Oct 29, 2022
• Acceptance Date: Dec 17, 2020
• Deposit Date: Jan 8, 2021
• Publisher URL: https://waset.org/fluid-mechanics-and-applications-conference-in-october-2022-in-lisbon
• Related Public URLs: https://waset.org/
• Additional Information: Event Type : Conference