This paper presents the results of a study of film coverage for coolant injection through an axisymmetric, contoured endwall of a high-pressure turbine first stage vane row. Tests are done on a low speed, linear cascade. The injection is either through a single slot upstream of the leading edges of the vanes or through two slots, one upstream of the other. Because the contouring begins upstream of the leading edges, injection is in an accelerating flow region. The effects of such injection on the secondary flows within the vane cascade are inferred by means of contours of dimensionless temperature. These thermal measurements are made by slightly heating the injection stream above the main flow temperature and documenting the temperatures inside the coolant-mainstream mixing zone. The thermal results are complemented with three-component, hot-wire measurements taken near the exit plane. Performance with different injection rates is discussed. The secondary flow seems to affect the cooling flow strongly when the momentum of the injected flow is small, compared to the main flow momentum. As a result, coolant coverage is non-uniform, with most of the coolant accumulating near the suction side of the passage. As the injection momentum is increased, some pressure-side accumulation of coolant is observed. However, non-uniformity still exists, with a lesser amount of coolant in the central region and more near the suction and pressure surfaces. For the same ratio of coolant to mainstream mass flow rates, cooling through a single slot seems to give more cooling towards the pressure side than does cooling through two slots. With the same mass flow rate, the one-slot case has higher injection momentum than does the two-slot case. This indicates that momentum flux is an important parameter in establishing the distribution of the coolant within the passage.
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ASME Turbo Expo 2001: Power for Land, Sea, and Air
June 4–7, 2001
New Orleans, Louisiana, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-7852-1
PROCEEDINGS PAPER
Measurements Over a Film-Cooled, Contoured Endwall With Various Coolant Injection Rates
Rohit Oke,
Rohit Oke
University of Minnesota, Minneapolis, MN
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Terry Simon,
Terry Simon
University of Minnesota, Minneapolis, MN
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Tom Shih,
Tom Shih
Michigan State University, East Lansing, MI
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Bin Zhu,
Bin Zhu
Michigan State University, East Lansing, MI
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Yu Liang Lin,
Yu Liang Lin
Michigan State University, East Lansing, MI
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Minking Chyu
Minking Chyu
University of Pittsburgh, Pittsburgh, PA
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Rohit Oke
University of Minnesota, Minneapolis, MN
Terry Simon
University of Minnesota, Minneapolis, MN
Tom Shih
Michigan State University, East Lansing, MI
Bin Zhu
Michigan State University, East Lansing, MI
Yu Liang Lin
Michigan State University, East Lansing, MI
Minking Chyu
University of Pittsburgh, Pittsburgh, PA
Paper No:
2001-GT-0140, V003T01A025; 10 pages
Published Online:
July 30, 2014
Citation
Oke, R, Simon, T, Shih, T, Zhu, B, Lin, YL, & Chyu, M. "Measurements Over a Film-Cooled, Contoured Endwall With Various Coolant Injection Rates." Proceedings of the ASME Turbo Expo 2001: Power for Land, Sea, and Air. Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration. New Orleans, Louisiana, USA. June 4–7, 2001. V003T01A025. ASME. https://doi.org/10.1115/2001-GT-0140
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