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Loss analysis of a mix-flow turbine with nozzled twin-entry volute at different admissions

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  • Xue, Yingxian
  • Yang, Mingyang
  • Martinez-Botas, Ricardo F.
  • Romagnoli, Alessandro
  • Deng, Kangyao

Abstract

This paper investigates performance and loss mechanism of a nozzled twin-entry mix-flow turbine at different admissions. Two sets of partial admissions and unequal admissions are analysed via experimentally validated numerical method. Results show that discrepancies of turbine efficiency between symmetrical unequal admissions (swopping inlet pressure on two entries) increase when unequal admissions approach to partial admissions, although their swallowing capacity is similar. Loss breakdown of turbine shows that loss is higher in nozzle but lower in rotor when the majority of flow is fed from upper part of the component (near shroud). Opposite phenomenon happens when the majority is fed from lower part (near hub). The reason for loss characteristic of nozzle is front-sweep configuration of the nozzle vane which results in evident flow separation when the flow is fed near the shroud. The reason for loss characteristic of rotor is the tornado-shaped vortex when the flow is fed from the hub. The tornado vortex is initiated by large incidence angle near hub and developed by the combination of Coriolis force, pressure gradient and centrifugal force. The study unveils loss mechanism among different admissions for a twin-entry turbine, which may enlighten the design methodology of the turbine with twin-entry volute.

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  • 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.
    • Handle: RePEc:eee:energy:v:166:y:2019:i:c:p:775-788
    DOI: 10.1016/j.energy.2018.10.075
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    References listed on IDEAS

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    1. Rajoo, Srithar & Romagnoli, Alessandro & Martinez-Botas, Ricardo F., 2012. "Unsteady performance analysis of a twin-entry variable geometry turbocharger turbine," Energy, Elsevier, vol. 38(1), pages 176-189.
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    Cited by:

    1. 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).
    2. José Galindo & Andrés Tiseira & Roberto Navarro & Lukas Benjamin Inhestern & Juan David Echavarría, 2022. "Numerical Analysis of the Effects of Different Rotor Tip Gaps in a Radial Turbine Operating at High Pressure Ratios Reaching Choked Flow," Energies, MDPI, vol. 15(24), pages 1-30, December.
    3. Hanwei Wang & Yue Chao & Tian Tang & Kai Luo & Kan Qin, 2021. "A Comparison of Partial Admission Axial and Radial Inflow Turbines for Underwater Vehicles," Energies, MDPI, vol. 14(5), pages 1-20, March.
    4. 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.
    5. Wang, Hanwei & Luo, Kai & Huang, Chuang & Zou, Aihong & Li, Daijin & Qin, Kan, 2022. "Numerical investigation of partial admission losses in radial inflow turbines," Energy, Elsevier, vol. 239(PA).
    6. Ketata, Ahmed & Driss, Zied, 2021. "Characterization of double-entry turbine coupled with gasoline engine under in- and out-phase admission," Energy, Elsevier, vol. 236(C).
    7. Ketata, Ahmed & Driss, Zied & Abid, Mohamed Salah, 2020. "Impact of blade number on performance, loss and flow characteristics of one mixed flow turbine," Energy, Elsevier, vol. 203(C).

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