The wakes that occur periodically owing to blade rotation, affect the HTCDs (heat transfer coefficient distributions) on the turbine blade tip and shroud. We investigated the wake effects on the HTCDs from the turbine blade tip with different configurations and the corresponding shroud. The NSM (naphthalene sublimation method) was used for measuring the local heat/mass transfer distributions (LHMTDs). Five different tip shapes were compared. The flow characteristics near turbine blade tip and shroud varied with respect to different tip shape. Especially, swirling flow and tip leakage flow patterns varied, which affected the HTD on the tip & shroud. In addition, the local heat transfer distributions (HTCDs) on the tip and the shroud varied with different tip configurations. However, when the wake effects were induced, the HTCDs on the tip & shroud became relatively uniform. Furthermore, the magnitudes of HTCDs on the tip & shroud were relatively similar in region of 0.3 < x/Cx < 0.8. owing to the wake effect. Therefore, the vertical rib case can be the best-adopted for the turbine blade tip by considering the reduced total PLC (pressure loss coefficients) and HTCDs.
|Journal||International Communications in Heat and Mass Transfer|
|Publication status||Published - 2021 Jul|
Bibliographical noteFunding Information:
This work was supported by the Human Resources Development program (No. 20204030200110 ) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, Industry, and Energy. This work was supported by the UAV High Efficiency Turbine Research Center program of Defense Acquisition Program Administration and Agency for Defense Development .
© 2021 Elsevier Ltd
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Chemical Engineering(all)
- Condensed Matter Physics