The authors previously found that compressor stage efficiency in a high specific speed range was significantly improved by employing an increased relative velocity diffusion ratio coupled with a high backsweep angle. In spite of such a high relative velocity diffusion ratio, the same surge margin as with a conventional design could be achieved by using a special front loading distribution with a lightly loaded inducer. In the present study, the blade loading distribution was further optimized in order to achieve a larger surge margin than previously. Four types of fully shrouded impellers were designed, manufactured and tested to evaluate the effects of blade loading, backsweep angle and relative velocity diffusion ratio on compressor performance. The design suction flow coefficient was 0.125 and the machine Mach number was 0.87. Test results showed that the developed impeller achieved 3.8% higher stage efficiency and 11% larger surge margin than the conventional design without reducing the pressure coefficient and choke margin. It was concluded that aft loading coupled with a high degree of reaction was a very effective way to improve surge margin as well as stage efficiency. Stator matching was also investigated by changing the design incidence angle which was shown to have little influence on surge margin in the present test results.
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ASME Turbo Expo 2010: Power for Land, Sea, and Air
June 14–18, 2010
Glasgow, UK
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4402-1
PROCEEDINGS PAPER
Effect of Impeller Blade Loading on Compressor Stage Performance in a High Specific Speed Range Available to Purchase
Takanori Shibata,
Takanori Shibata
Hitachi, Ltd., Hitachinaka, Ibaraki, Japan
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Manabu Yagi,
Manabu Yagi
Hitachi, Ltd., Hitachinaka, Ibaraki, Japan
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Hideo Nishida,
Hideo Nishida
Hitachi Plant Technologies, Ltd., Tsuchiura, Ibaraki, Japan
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Hiromi Kobayashi,
Hiromi Kobayashi
Hitachi Plant Technologies, Ltd., Tsuchiura, Ibaraki, Japan
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Masanori Tanaka
Masanori Tanaka
Hitachi Plant Technologies, Ltd., Tsuchiura, Ibaraki, Japan
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Takanori Shibata
Hitachi, Ltd., Hitachinaka, Ibaraki, Japan
Manabu Yagi
Hitachi, Ltd., Hitachinaka, Ibaraki, Japan
Hideo Nishida
Hitachi Plant Technologies, Ltd., Tsuchiura, Ibaraki, Japan
Hiromi Kobayashi
Hitachi Plant Technologies, Ltd., Tsuchiura, Ibaraki, Japan
Masanori Tanaka
Hitachi Plant Technologies, Ltd., Tsuchiura, Ibaraki, Japan
Paper No:
GT2010-22281, pp. 1757-1768; 12 pages
Published Online:
December 22, 2010
Citation
Shibata, T, Yagi, M, Nishida, H, Kobayashi, H, & Tanaka, M. "Effect of Impeller Blade Loading on Compressor Stage Performance in a High Specific Speed Range." Proceedings of the ASME Turbo Expo 2010: Power for Land, Sea, and Air. Volume 7: Turbomachinery, Parts A, B, and C. Glasgow, UK. June 14–18, 2010. pp. 1757-1768. ASME. https://doi.org/10.1115/GT2010-22281
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