Influence of dust purge hole on thermal performance and particle deposition of a turbine blade with ribbed internal cooling channel
Pages 299 - 316
Abstract
As a deposition alleviation approach, the purging of dust from the internal cooling channels of turbine blade has received much attention. In this study, the dust purge hole (DPH) effect on the thermal, particle deposition and purge behaviors inside the internal channel are studied numerically. Three DPH configurations (hole I aside the inlet, hole II at the center, and hole III aside outlet) are adopted to explore their effect on the thermal performance and deposition of endwall, sidewall, and downstream ribbed wall, respectively. For the thermal behavior, hole I showed the highest heat transfer performance. Specifically, the area-average normalize Nusselt number at Re = 25,000 is 2.04 and 2.38 for the endwall and the leading sidewall, respectively. Numerical results of hole I showed the most severe deposition at the endwall (capture efficiency of 17.2% at Re = 25,000), while hole III showed the most at the sidewall (capture efficiency of 14.1% at Re = 25,000). As for the particle purge behavior, hole II exhibited the highest purge efficiency compared to hole I and III, which is 9.3% at Re = 25,000 and 15.7% at Re = 50,000. In general, the addition of DPH at the center (hole II) demonstrated the best performance, showing the highest purge efficiency and least particle depositions, which is recommended for DPH design in gas turbine engine.
Graphical abstract
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Publication History
Published: 20 October 2022
Accepted: 13 September 2022
Revision received: 19 August 2022
Received: 02 August 2022
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