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A reduced-order model of twin-entry nozzleless radial turbine based on flow characteristics

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  • Wei, Jiangshan
  • Xue, Yingxian
  • Yang, Mingyang
  • Deng, Kangyao
  • Wang, Cuicui
  • Wu, Xintao

Abstract

Twin-entry radial turbine has evident advantages on energy recovery of internal combustion engine because of better utilization of exhaust pulse energy. One-dimensional performance prediction plays an important role in automobile industry because of the cost-effective feature. However, as twin-entry turbine is confronted by out-of-phase pulses, to capture the flow distortion by twin-entry turbine model is challenging, especially under partial admission conditions. This paper establishes a reduced-order parallel-rotor model for performance prediction of twin-entry nozzleless radial turbine based on internal flow characteristics. Firstly, twin-entry turbine experiment and 3D simulation are applied to analyze the different flow features under partial admission conditions. The flow distortions in the spanwise and circumferential directions are both demonstrated. Based on these flow characteristics, a reduced-order twin-entry turbine model with parallel rotor passages is established for predicting the rotor at distorted flow field. Finally, the model is carefully validated against the results of CFD. The results show that satisfied consistency can be obtained and the maximum discrepancy of turbine performance is 3.8% and the performance difference and flow distortion under partial admissions can be captured, thus prove the credibility of the model. This investigation provides a reliable methodology for performance prediction and behavior analysis of twin-entry turbine.

Suggested Citation

  • Wei, Jiangshan & Xue, Yingxian & Yang, Mingyang & Deng, Kangyao & Wang, Cuicui & Wu, Xintao, 2021. "A reduced-order model of twin-entry nozzleless radial turbine based on flow characteristics," Energy, Elsevier, vol. 214(C).
    • Handle: RePEc:eee:energy:v:214:y:2021:i:c:s0360544220319976
    DOI: 10.1016/j.energy.2020.118890
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    References listed on IDEAS

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    1. Serrano, José Ramón & Navarro, Roberto & García-Cuevas, Luis Miguel & Inhestern, Lukas Benjamin, 2018. "Turbocharger turbine rotor tip leakage loss and mass flow model valid up to extreme off-design conditions with high blade to jet speed ratio," Energy, Elsevier, vol. 147(C), pages 1299-1310.
    2. Chiong, M.S. & Rajoo, S. & Romagnoli, A. & Costall, A.W. & Martinez-Botas, R.F., 2016. "One-dimensional pulse-flow modeling of a twin-scroll turbine," Energy, Elsevier, vol. 115(P1), pages 1291-1304.
    3. Xue, Yingxian & Yang, Mingyang & Martinez-Botas, Ricardo F. & Romagnoli, Alessandro & Deng, Kangyao, 2019. "Loss analysis of a mix-flow turbine with nozzled twin-entry volute at different admissions," Energy, Elsevier, vol. 166(C), pages 775-788.
    4. Serrano, José Ramón & Olmeda, Pablo & Tiseira, Andrés & García-Cuevas, Luis Miguel & Lefebvre, Alain, 2013. "Theoretical and experimental study of mechanical losses in automotive turbochargers," Energy, Elsevier, vol. 55(C), pages 888-898.
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    Cited by:

    1. Vittorio Usai & Silvia Marelli, 2021. "Steady State Experimental Characterization of a Twin Entry Turbine under Different Admission Conditions," Energies, MDPI, vol. 14(8), pages 1-17, April.

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