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Turbine Design and Optimization for a Supercritical CO 2 Cycle Using a Multifaceted Approach Based on Deep Neural Network

Author

Listed:
  • Muhammad Saeed

    (Mechanical Engineering Department, Khalifa University of Science and Technology, Abu Dhabi P.O. Box 127788, United Arab Emirates)

  • Abdallah S. Berrouk

    (Mechanical Engineering Department, Khalifa University of Science and Technology, Abu Dhabi P.O. Box 127788, United Arab Emirates
    Center for Catalysis and Separation (CeCas), Khalifa University of Science and Technology, Abu Dhabi P.O. Box 127788, United Arab Emirates)

  • Burhani M. Burhani

    (Aerospace Engineering Department, Khalifa University of Science and Technology, Abu Dhabi P.O. Box 127788, United Arab Emirates)

  • Ahmed M. Alatyar

    (Mechanical Engineering Department, Khalifa University of Science and Technology, Abu Dhabi P.O. Box 127788, United Arab Emirates)

  • Yasser F. Al Wahedi

    (Abu Dhabi Maritime Academy, Abu Dhabi P.O. Box 54477, United Arab Emirates)

Abstract

Turbine as a key power unit is vital to the novel supercritical carbon dioxide cycle (sCO 2 -BC). At the same time, the turbine design and optimization process for the sCO 2 -BC is complicated, and its relevant investigations are still absent in the literature due to the behavior of supercritical fluid in the vicinity of the critical point. In this regard, the current study entails a multifaceted approach for designing and optimizing a radial turbine system for an 8 MW sCO 2 power cycle. Initially, a base design of the turbine is calculated utilizing an in-house radial turbine design and analysis code (RTDC), where sharp variations in the properties of CO 2 are implemented by coupling the code with NIST’s Refprop. Later, 600 variants of the base geometry of the turbine are constructed by changing the selected turbine design geometric parameters, i.e., shroud ratio ( r s 4 r 3 ) , hub ratio ( r s 4 r 3 ) , speed ratio ( ν s ) and inlet flow angle ( α 3 ) and are investigated numerically through 3D-RANS simulations. The generated CFD data is then used to train a deep neural network (DNN). Finally, the trained DNN model is employed as a fitting function in the multi-objective genetic algorithm (MOGA) to explore the optimized design parameters for the turbine’s rotor geometry. Moreover, the off-design performance of the optimized turbine geometry is computed and reported in the current study. Results suggest that the employed multifaceted approach reduces computational time and resources significantly and is required to completely understand the effects of various turbine design parameters on its performance and sizing. It is found that sCO 2 -turbine performance parameters are most sensitive to the design parameter speed ratio ( ν s ), followed by inlet flow angle ( α 3 ) , and are least receptive to shroud ratio ( r s 4 r 3 ). The proposed turbine design methodology based on the machine learning algorithm is effective and substantially reduces the computational cost of the design and optimization phase and can be beneficial to achieve realistic and efficient design to the turbine for sCO 2 -BC.

Suggested Citation

  • Muhammad Saeed & Abdallah S. Berrouk & Burhani M. Burhani & Ahmed M. Alatyar & Yasser F. Al Wahedi, 2021. "Turbine Design and Optimization for a Supercritical CO 2 Cycle Using a Multifaceted Approach Based on Deep Neural Network," Energies, MDPI, vol. 14(22), pages 1-27, November.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:22:p:7807-:d:684817
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    References listed on IDEAS

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    1. Karl Lindqvist & Zachary T. Wilson & Erling Næss & Nikolaos V. Sahinidis, 2018. "A Machine Learning Approach to Correlation Development Applied to Fin-Tube Bundle Heat Exchangers," Energies, MDPI, vol. 11(12), pages 1-16, December.
    2. Saeed, Muhammad & Kim, Man-Hoe, 2018. "Analysis of a recompression supercritical carbon dioxide power cycle with an integrated turbine design/optimization algorithm," Energy, Elsevier, vol. 165(PA), pages 93-111.
    3. Muhammed Saeed & Abdallah S. Berrouk & Munendra Pal Singh & Khaled Alawadhi & Muhammad Salman Siddiqui, 2021. "Analysis of Supercritical CO 2 Cycle Using Zigzag Channel Pre-Cooler: A Design Optimization Study Based on Deep Neural Network," Energies, MDPI, vol. 14(19), pages 1-28, September.
    4. Mohammad Omidi & Shu-Jie Liu & Soheil Mohtaram & Hui-Tian Lu & Hong-Chao Zhang, 2019. "Improving Centrifugal Compressor Performance by Optimizing the Design of Impellers Using Genetic Algorithm and Computational Fluid Dynamics Methods," Sustainability, MDPI, vol. 11(19), pages 1-18, September.
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