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Supersonic turbine stator design using dense gas with numerical method

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Abstract

In recent years, interest in renewable energy as a substitute for power generation using coal has increased. As a next-generation power system, the Organic Rankine cycle (ORC) system, which requires a multi-stage turbine or a supersonic turbine to generate a high power, has been shown to have high potential for such uses. In this paper, a dense gas is chosen as a working fluid and a supersonic nozzle is designed for a supersonic turbine with advantages in terms of cost, power density and layout. Two stators are designed using the Method of characteristics (MOC) for air and dense gas. To validate the numerical model, the nozzle designed for the air is compared to that of a PIV experiment from the open literature, and the results indicate a reasonable agreement. The nozzle for the dense gas is different as that needed for air. Therefore, the modified MOC is applied based on a polytropic assumption. In conclusion, an estimation of the performance is implemented with loss coefficients for a different number of blades. The number of blades is shown to be proportional to the loss coefficient. For example, the case with the biggest numbers of blades is affected the most by the shock effect that occurs at the trailing edge.

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Authors and Affiliations

  1. Seoul National University of Science and Technology, Seoul, 139-743, Korea

    J. Seo & S. Han

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  1. J. Seo
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  2. S. Han
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Correspondence to S. Han.

Additional information

Recommended by Associate Editor Simon Song

Jongbeom Seo is a graduate student in the Department of Mechanical Engineering of Seoul National University of Science and Technology in Korea. He studies about turbomachinery, and heat and mass transfer analogy and obtained the Master’s degree from Seoul National University of Science and Technology in 2015.

Sangjo Han is an Assistant Professor in the Department of Mechanical Engineering of Seoul National University of Science and Technology in Korea. He obtained the Ph.D. degree from the University of Minnesota, USA, in 2004. He had worked at Samsung Electronics Co. for 2005-2008 as a Principal Investigator. For 2008-2011, he had worked at KIMM as a Senior Researcher. His research interests include heat and mass transfer, thermal process design, gas turbines, and organic Rankine cycle system. He can be reached at sjhan@seoultech.ac.kr.

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Seo, J., Han, S. Supersonic turbine stator design using dense gas with numerical method. J Mech Sci Technol 31, 4297–4303 (2017). https://doi.org/10.1007/s12206-017-0828-3

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  • DOI: https://doi.org/10.1007/s12206-017-0828-3

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