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 (Shibata et al., “Performance Improvement of a Centrifugal Compressor Stage by Increasing Degree of Reaction Optimizing Blade Loading of a 3D-Impeller,” ASME Paper No. GT2009-59588). In spite of such a high relative velocity diffusion ratio, the same surge margin as with a conventional design was able to 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 a little influence on surge margin in the present test results.
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July 2012
Research Papers
Effect of Impeller Blade Loading on Compressor Stage Performance in a High Specific Speed Range
Takanori Shibata,
Takanori Shibata
Energy and Environmental Systems Laboratory,
e-mail: takanori.shibata.by@hitachi.com
Hitachi, Ltd.
, 2-1, Omika-cho, 7-chome, Hitachi-shi, Ibaraki 319-1221, Japan
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Manabu Yagi,
Manabu Yagi
Energy and Environmental Systems Laboratory,
Hitachi, Ltd.
, 2-1, Omika-cho, 7-chome, Hitachi-shi, Ibaraki 319-1221, Japan
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Hideo Nishida,
Hideo Nishida
Tsuchiura Research Laboratory,
Hitachi Plant Technologies, Ltd.
, 603 Kandatsu-machi, Tsuchiura-shi, Ibaraki 300-0013, Japan
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Hiromi Kobayashi,
Hiromi Kobayashi
Tsuchiura Research Laboratory,
Hitachi Plant Technologies, Ltd.
, 603 Kandatsu-machi, Tsuchiura-shi, Ibaraki 300-0013, Japan
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Masanori Tanaka
Masanori Tanaka
Tsuchiura Research Laboratory,
Hitachi Plant Technologies, Ltd.
, 603 Kandatsu-machi, Tsuchiura-shi, Ibaraki 300-0013, Japan
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Takanori Shibata
Energy and Environmental Systems Laboratory,
Hitachi, Ltd.
, 2-1, Omika-cho, 7-chome, Hitachi-shi, Ibaraki 319-1221, Japane-mail: takanori.shibata.by@hitachi.com
Manabu Yagi
Energy and Environmental Systems Laboratory,
Hitachi, Ltd.
, 2-1, Omika-cho, 7-chome, Hitachi-shi, Ibaraki 319-1221, Japan
Hideo Nishida
Tsuchiura Research Laboratory,
Hitachi Plant Technologies, Ltd.
, 603 Kandatsu-machi, Tsuchiura-shi, Ibaraki 300-0013, Japan
Hiromi Kobayashi
Tsuchiura Research Laboratory,
Hitachi Plant Technologies, Ltd.
, 603 Kandatsu-machi, Tsuchiura-shi, Ibaraki 300-0013, Japan
Masanori Tanaka
Tsuchiura Research Laboratory,
Hitachi Plant Technologies, Ltd.
, 603 Kandatsu-machi, Tsuchiura-shi, Ibaraki 300-0013, JapanJ. Turbomach. Jul 2012, 134(4): 041012 (9 pages)
Published Online: July 21, 2011
Article history
Received:
October 11, 2010
Revised:
January 12, 2011
Online:
July 21, 2011
Published:
July 21, 2011
Citation
Shibata, T., Yagi, M., Nishida, H., Kobayashi, H., and Tanaka, M. (July 21, 2011). "Effect of Impeller Blade Loading on Compressor Stage Performance in a High Specific Speed Range." ASME. J. Turbomach. July 2012; 134(4): 041012. https://doi.org/10.1115/1.4003659
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