This paper presents the results from the first experimental assessment of herringbone riblets in reducing total pressure losses in a linear cascade of diffuser blades. The experiments were undertaken at Re = 1 × 105, M = 0.13 and a free stream turbulent intensity of 2%. Three cascade configurations were examined at a blade incidence angle of 0.8°; Case A: the baseline case without surface modification; Case B: blades with smooth strips; Case C: blades with ribleted strips. In Case A, flow separation starts at 24.1%c from the blade leading edge followed by a complete stall, resulting in significant total pressure losses as measured by a five-hole probe on a cross-flow plane downstream. Seven smooth or ribleted strips were adhered on the blade suction surfaces along their span in Case B and Case C. In comparison to Case A, the average total pressure loss coefficient is decreased by 6.4% and 16.8% in Case B and Case C, respectively. The velocity vectors leaving the cross-flow measurement plane also appear to be more uniformly distributed with the average flow turning angle being increased by 4° and 10° in Case B and Case C respectively, indicating that the extent of flow separation in the cascade has been reduced substantially. Furthermore, a pseudo sound power analysis of hot-wire data in the blade wake reveals a reduction in the noise level of 1.1dB and 1.6 dB, respectively. These results hence provide strong evidence that a profound aerodynamic improvement can be achieved in a cascade with the use of herringbone riblets.
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ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
June 26–30, 2017
Charlotte, North Carolina, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5078-7
PROCEEDINGS PAPER
Reduction of Pressure Losses in a Linear Cascade Using Herringbone Riblets
Qiang Liu,
Qiang Liu
Manchester University, Manchester, UK
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Shan Zhong,
Shan Zhong
Manchester University, Manchester, UK
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Lin Li
Lin Li
Manchester University, Manchester, UK
Search for other works by this author on:
Qiang Liu
Manchester University, Manchester, UK
Shan Zhong
Manchester University, Manchester, UK
Lin Li
Manchester University, Manchester, UK
Paper No:
GT2017-63960, V02AT39A025; 8 pages
Published Online:
August 17, 2017
Citation
Liu, Q, Zhong, S, & Li, L. "Reduction of Pressure Losses in a Linear Cascade Using Herringbone Riblets." Proceedings of the ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. Volume 2A: Turbomachinery. Charlotte, North Carolina, USA. June 26–30, 2017. V02AT39A025. ASME. https://doi.org/10.1115/GT2017-63960
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