期刊
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
卷 135, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.icheatmasstransfer.2022.106112
关键词
Film cooling; Swirling coolant; Pressure sensitive paint; Vortex-pairs; Density ratio
资金
- National Natural Science Foundation of China [51676163]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515111146]
- Fundamental Research Funds for the Central Universities in China [3102020HHZY030005]
- Natural Science Basic Research Plan in Shaanxi Province of China [2021JQ-104]
- National 111 Project [B18041]
Modern gas turbines use combined internal and external cooling methods to achieve higher cooling effectiveness. Swirl in the coolant enhances film cooling effectiveness for one row of holes, but decreases it for two rows of staggered holes.
Modern gas turbines use combined internal and external cooling methods to achieve higher cooling effectiveness. The internal cooling methods, like internal serpentine channel cooling and impingement cooling, will introduce swirl to the coolant of film cooling. In this paper, film cooling effectiveness of one row and two rows of holes with and without swirling coolant was measured using pressure sensitive paint (PSP). Numerical simulations were performed to analyze the flow structures. Results show that swirl in coolant enhances film cooling effectiveness for one row of holes when the density ratio is low or blowing ratio is high. When the blowing ratios are 1.0 and 1.5, the improvements of averaged film cooling effectiveness are from 24.1% to 51.3% at the density ratio of 1, while the improvements are from 1.3% to 36.8% at the density ratio of 1.5. The reason is that the swirling in the coolant breaks the symmetricity of counter-rotating vortex pairs, leading to a deviation of streaks of film coverage and better attachment under high blowing ratios. However, due to the swirl, film cooling effectiveness for two rows of staggered holes is decreased, because the swirl turns the coolant flow direction and creates poor coolant coverage areas between adjacent holes, and weakens the coolant accumulation and re-attachment at further downstream area
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