摘要
To investigate the influence of mainstream turbulence intensity on the film cooling characteristics of diffused film cooling holes on turbine vane pressure side, an experiment was carried out in the high subsonic wind tunnel, and the film cooling effectiveness and heat transfer coefficient downstream of the film hole row were measured by thermocouples. The inlet Reynolds number of the cascade ranged from 3.0×105 to 9.0×105, and the exit Mach number was 0.8. Two rows of single-row diffused film holes were located at the relative arc lengths of 25% and 70% on the pressure side. The high and low turbulence intensities were 14.7% and 1.3%, respectively. The experimental results show that for the row A, with the increase of the blowing ratio, the film cooling effectiveness increases first and then decreases in low turbulence intensity condition, while increases monotonously in high turbulence intensity condition. For the same blowing ratio condition, increased mainstream turbulence intensity strengthens the mixing of mainstream and coolant and enhances the dissipation of coolant, thus decreases the film cooling effectiveness. For the row B, elevated mainstream turbulence intensity decreases film cooling effectiveness at small blowing ratios, however suppresses the lift-off of coolant at large blowing ratios and increases film cooling effectiveness. The increase of blowing ratio significantly strengthens the heat transfer downstream of the row A, however has less effect on the row B. The increase of the mainstream turbulence intensity obviously raises the heat transfer coefficient ratio downstream of the row A and B. Overall, elevated mainstream turbulence intensity deteriorates the film cooling performance of the row A and B.
投稿的翻译标题 | Effects of Mainstream Turbulence Intensity on Film Cooling Characteristics of Diffused Holes on Turbine Vane Pressure Side |
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源语言 | 繁体中文 |
页(从-至) | 58-69 |
页数 | 12 |
期刊 | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University |
卷 | 54 |
期 | 3 |
DOI | |
出版状态 | 已出版 - 10 3月 2020 |
关键词
- Diffused film cooling hole
- Film cooling effectiveness
- Heat transfer coefficient ratio
- Mainstream turbulence intensity
- Turbine vane