High thermal load on the turbine blade tip surface would lead to high temperature corrosion and severe structural damage. One method to reduce blade tip high thermal stress is to use cooler fluid from the compressor, that exists dirt purge hole mounted on the tip underside, for cooling purpose. In this study, internal serpentine cooling passage is modeled as a U bend channel with a sharp 180-deg turn with the dirt purge hole arranged at the tip-wall. The effect of the layout of dirt purge hole and varying coolant mass flow rate on flow structure, heat transfer on the tip-wall and friction factor of the U bend channel are numerically studied with Reynolds number ranging from 100,000 to 440,000. The results show that the vortex pair is forced to flow near the tip-wall while the increasing shearing effect induced by the vortex pairs increases the local heat transfer. With an increase mass flow rate of the dirt purge hole, the suction effect enhances the local heat transfer performance. However, the pressure loss is also increased accordingly at all Reynolds numbers. The augmentations with Reynold analogy performance and the thermal performance for 5.8% mass flow rate case is 12.5% and 12.7%, respectively, which reaches the highest performance augmentation compared to the smooth-tip channel.
Skip Nav Destination
ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition
June 11–15, 2018
Oslo, Norway
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5108-1
PROCEEDINGS PAPER
Effect of Coolant Mass Flow Rate of Dirt Purge Hole on Heat Transfer and Flow Characteristics at a Turbine Blade Tip Underside
Zhiqi Zhao,
Zhiqi Zhao
Harbin Institute of Technology, Harbin, China
Search for other works by this author on:
Lei Luo,
Lei Luo
Harbin Institute of Technology, Harbin, China
Search for other works by this author on:
Xun Zhou,
Xun Zhou
Harbin Institute of Technology, Harbin, China
Search for other works by this author on:
Songtao Wang
Songtao Wang
Harbin Institute of Technology, Harbin, China
Search for other works by this author on:
Zhiqi Zhao
Harbin Institute of Technology, Harbin, China
Lei Luo
Harbin Institute of Technology, Harbin, China
Xun Zhou
Harbin Institute of Technology, Harbin, China
Songtao Wang
Harbin Institute of Technology, Harbin, China
Paper No:
GT2018-76156, V05AT11A009; 9 pages
Published Online:
August 30, 2018
Citation
Zhao, Z, Luo, L, Zhou, X, & Wang, S. "Effect of Coolant Mass Flow Rate of Dirt Purge Hole on Heat Transfer and Flow Characteristics at a Turbine Blade Tip Underside." Proceedings of the ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. Volume 5A: Heat Transfer. Oslo, Norway. June 11–15, 2018. V05AT11A009. ASME. https://doi.org/10.1115/GT2018-76156
Download citation file:
53
Views
Related Proceedings Papers
Related Articles
Latticework (Vortex) Cooling Effectiveness: Rotating Channel Experiments
J. Turbomach (July,2005)
Aerothermodynamics of
a High-Pressure Turbine Blade With Very High Loading and Vortex
Generators
J. Turbomach (January,2012)
Bump and Trench Modifications to Film-Cooling Holes at the Vane-Endwall Junction
J. Turbomach (October,2008)
Related Chapters
Control and Operational Performance
Closed-Cycle Gas Turbines: Operating Experience and Future Potential
Outlook
Closed-Cycle Gas Turbines: Operating Experience and Future Potential
Cavitating Structures at Inception in Turbulent Shear Flow
Proceedings of the 10th International Symposium on Cavitation (CAV2018)