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Experimental Study in a Cascade Row for Improving the Performance of a Partially Admitted Turbo-Expander

Author

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  • Soo-Yong Cho

    (Department of Aerospace & System Engineering (ReCAPT), Gyeong-Sang National University, 501 Jinju-daero, Jinju 660-701, Korea)

  • Chong-Hyun Cho

    (Department of Aerospace & System Engineering (ReCAPT), Gyeong-Sang National University, 501 Jinju-daero, Jinju 660-701, Korea
    These authors contributed equally to this work.)

  • Chae Whan Rim

    (Department of System Reliability, Korea Institute of Machinery and Materials, Yu-Sung, 171 Jangdong, Daejeon 305-343, Korea
    These authors contributed equally to this work.)

  • Sang-Kyu Choi

    (Department of System Reliability, Korea Institute of Machinery and Materials, Yu-Sung, 171 Jangdong, Daejeon 305-343, Korea
    These authors contributed equally to this work.)

Abstract

Turbo-expanders are widely used as power generators in the field of energy conversion such as organic Rankine cycle (ORC) systems. When the available thermal energy is not sufficient to operate the turbo-expander in full admission, it is much better to operate in partial admission instead of stand-down. However, the performance of the turbo-expander greatly depends on the operating conditions. Among many operating conditions, the flow angle at the nozzle and solidity can be major factors affecting the performance of the expander. In order to investigate the optimal operation conditions, experiments were conducted in a linear cascade apparatus simulating the operation of turbo-expander in partial admission. Three different nozzle flow angles of 58°, 65°, and 72° were adopted, and the experiments were conducted with respective solidities of 1.25, 1.38, and 1.67 at each nozzle flow angle. The cross section of the nozzle was rectangular and the chord of the tested blade was 200 mm. The blades moved in a rotational direction, and the forces on the blades were measured with the surface pressure at steady state. The experimental results showed that the rotational force increased for a larger solidity or for a smaller nozzle flow angle.

Suggested Citation

  • Soo-Yong Cho & Chong-Hyun Cho & Chae Whan Rim & Sang-Kyu Choi, 2015. "Experimental Study in a Cascade Row for Improving the Performance of a Partially Admitted Turbo-Expander," Energies, MDPI, vol. 8(12), pages 1-14, December.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:12:p:12385-13589:d:59713
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    References listed on IDEAS

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    1. Cho, Soo-Yong & Cho, Chong-Hyun & Ahn, Kook-Young & Lee, Young Duk, 2014. "A study of the optimal operating conditions in the organic Rankine cycle using a turbo-expander for fluctuations of the available thermal energy," Energy, Elsevier, vol. 64(C), pages 900-911.
    2. Pei, Gang & Li, Jing & Li, Yunzhu & Wang, Dongyue & Ji, Jie, 2011. "Construction and dynamic test of a small-scale organic rankine cycle," Energy, Elsevier, vol. 36(5), pages 3215-3223.
    3. Kang, Seok Hun, 2012. "Design and experimental study of ORC (organic Rankine cycle) and radial turbine using R245fa working fluid," Energy, Elsevier, vol. 41(1), pages 514-524.
    4. Roberto Capata & Gustavo Hernandez, 2014. "Preliminary Design and Simulation of a Turbo Expander for Small Rated Power Organic Rankine Cycle (ORC)," Energies, MDPI, vol. 7(11), pages 1-27, November.
    5. Leonardo Pierobon & Tuong-Van Nguyen & Andrea Mazzucco & Ulrik Larsen & Fredrik Haglind, 2014. "Part-Load Performance of aWet Indirectly Fired Gas Turbine Integrated with an Organic Rankine Cycle Turbogenerator," Energies, MDPI, vol. 7(12), pages 1-23, December.
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