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One-pitch passage designed inversely with a single blade for cascade experiments

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Abstract

A linear cascade experimental apparatus often consists of only a few cascade blades. Advantages to this experimental arrangement are increased by the use of larger cascade blades, a lower mass flow rate, a corresponding decrease in required power, and easier optical access within the cascade passage. However, fewer cascade blades in the cascade row make it difficult to establish periodic flow conditions between blades compared to infinite cascade model experiments. Generally, removing fluid from the cascade walls or adjusting tailboards located downstream of the cascade are common methods to establish periodic flow conditions through the cascade blades. In this study, a passage for cascade experiments is designed to satisfy infinite cascade flow conditions without any flow control or tailboards. A one-pitch at cascade row is adopted as its width and only a single cascade blade is installed within the passage. The surface isentropic Mach number distribution on the blade is chosen for the existence of infinite cascade flow conditions, and 14 geometric design variables related to the passage shape are applied to the design of a one-pitch passage by using a genetic algorithm. Flow structures within a passage designed using a genetic algorithm match with those obtained with the infinite cascade flow condition. Computed results obtained with a single cascade blade show that infinite cascade flow conditions can be obtained by modifying only the passage walls of the cascade experimental apparatus.

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering(RECAPT), Gyeongsang National University, Jinju, 660-701, Korea

    Chong-Hyun Cho & Soo-Yong Cho

  2. Department of Eco-Machinery Korea Institute of Machinery and Materials, Daejeon, 305-343, Korea

    Kook-Young Ahn & Young-Cheol Kim

Authors
  1. Chong-Hyun Cho
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  2. Kook-Young Ahn
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  3. Young-Cheol Kim
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  4. Soo-Yong Cho
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Corresponding author

Correspondence to Soo-Yong Cho.

Additional information

This paper was recommended for publication in revised form by Associate Editor Won-Gu Joo

Chong-Hyun Cho obtained his M. S. and Ph.D. degrees from Gyeongsang National University, Korea, in 2006 and 2010. Dr. Cho is currently a Research Professor at RECAPT in Gyeongsang National University, Korea. Dr. Cho’s research interests include turbomachinery design, CFD, wind tunnel test and experiment.

Kook-Young Ahn obtained his Ph.D. degree from the Department of Mechanical Engineering, KAIST, Korea, in 1994. Currently, he is a Principal Researcher in the Environment & Energy Research Division at Korea Institute of Machinery & Materials (KIMM). Also, He is the Head Professor of the Faculty of Environmental System Engineering at University of Science & Technology (UST).

Young-Cheol Kim obtained his Ph.D. degree from the Department of Mechanical Engineering, KAIST, Korea, in 2008. Currently, he is a Principal Researcher in the System Engineering Research Division at Korea Institute of Machinery & Materials (KIMM).

Soo-Yong Cho obtained his Ph.D. degrees from Case Western Reserve University, USA in 1992. Dr. Cho is currently a Professor at the Department of Mechanical and Aerospace Engineering, Gyeongsang National University, Jinju, Korea. Dr. Cho’s research interests include turbomachinery, energy conversion, CFD and experiment.

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Cho, CH., Ahn, KY., Kim, YC. et al. One-pitch passage designed inversely with a single blade for cascade experiments. J Mech Sci Technol 24, 1799–1807 (2010). https://doi.org/10.1007/s12206-010-0630-y

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  • DOI: https://doi.org/10.1007/s12206-010-0630-y

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