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Influence of unsteady stage-interaction on loss generation in regulated two-stage radial turbines at pulsating conditions

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  • Lu, Zhaokai
  • Yang, Mingyang
  • Pan, Lei
  • Ni, Qingming
  • Xu, Dong
  • Deng, Kangyao

Abstract

Regulated multi-stage turbocharging is a key technology to achieve energy conservation and CO2 emission reduction in internal combustion engine with carbon-free fuel. The understanding of performance of the turbocharging system at the engine conditions is essential for the optimization of engine performance. This paper studies unsteady aerodynamic interaction in regulated two-stage turbocharger turbines at pulsating conditions produced by a heavy-duty diesel engine. Results show that the performance of high-pressure turbine (HPT) is highly sensitive to the unsteady stage-interaction, which is profoundly different from that of the low-pressure turbine (LPT). Specifically, when the bypass valve is opened, the cycle-average efficiency of the HPT declines significantly up to 10.8 % compared with that of closed valve. On the other hand, LPT is slightly influenced by the valve state, and the cycle-average efficiency drops by about 0.2 % when the valve is open. The entropy generation method is used to analyze the unsteady loss in HPT and LPT to unveil the mechanism of the unsteady interaction. Detailed flow analysis shows that the swirling flow result in the evident increase of entropy generation in the HPT and LPT volute. Meanwhile, tip leakage loss and incidence loss of HPT is enhanced by unsteady stage interaction.

Suggested Citation

  • Lu, Zhaokai & Yang, Mingyang & Pan, Lei & Ni, Qingming & Xu, Dong & Deng, Kangyao, 2024. "Influence of unsteady stage-interaction on loss generation in regulated two-stage radial turbines at pulsating conditions," Energy, Elsevier, vol. 304(C).
    • Handle: RePEc:eee:energy:v:304:y:2024:i:c:s0360544224017316
    DOI: 10.1016/j.energy.2024.131958
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    References listed on IDEAS

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    1. Zhao, Rongchao & Li, Weihua & Zhuge, Weilin & Zhang, Yangjun & Yin, Yong & Wu, Yonghui, 2018. "Characterization of two-stage turbine system under steady and pulsating flow conditions," Energy, Elsevier, vol. 148(C), pages 407-423.
    2. 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.
    3. Avola, Calogero & Copeland, Colin D. & Burke, Richard D. & Brace, Chris J., 2017. "Effect of inter-stage phenomena on the performance prediction of two-stage turbocharging systems," Energy, Elsevier, vol. 134(C), pages 743-756.
    4. Ding, Zhanming & Zhuge, Weilin & Zhang, Yangjun, 2019. "Assessment of turbine performance under swirling inflow conditions," Energy, Elsevier, vol. 168(C), pages 492-504.
    5. Marelli, Silvia & Capobianco, Massimo, 2011. "Steady and pulsating flow efficiency of a waste-gated turbocharger radial flow turbine for automotive application," Energy, Elsevier, vol. 36(1), pages 459-465.
    Full references (including those not matched with items on IDEAS)

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