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Unsteady performance analysis of a twin-entry variable geometry turbocharger turbine

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  • Rajoo, Srithar
  • Romagnoli, Alessandro
  • Martinez-Botas, Ricardo F.

Abstract

This paper discusses the details of unsteady experimentation and analysis of a twin-entry variable geometry turbine for an automotive turbocharger. The turbine in this study is the product of design progression from a commercial nozzleless unit to a single-entry variable geometry and consequently to a twin-entry unit. The main features of the turbine were kept similar across all configurations for equivalent comparison basis. The unsteady curves of the twin-entry turbine exhibited the conventional looping characteristics representing filling and emptying effects, which was also the case for the nozzleless and single-entry nozzled turbine. The swallowing capacity of the twin-entry turbine, during full admission testing, was recorded to be inconsistent between the two entries, in particular they were at different pressure ratio levels – the shroud end entry was in most cases more pressurized compared to the hub end entry, as much as 13%. Contrarily, during out-of-phase testing the swallowing capacity of both the turbine entries was found to be similar. The cycle-averaged efficiency of the nozzled turbine either twin or single-entry was found to depart significantly from the equivalent quasi-steady, in comparison to the nozzleless single-entry turbine, this was as much as 32%.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:38:y:2012:i:1:p:176-189
    DOI: 10.1016/j.energy.2011.12.017
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    References listed on IDEAS

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    5. Zhu, Dengting & Zheng, Xinqian, 2019. "Fuel consumption and emission characteristics in asymmetric twin-scroll turbocharged diesel engine with two exhaust gas recirculation circuits," Applied Energy, Elsevier, vol. 238(C), pages 985-995.
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    8. 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.
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    11. 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.
    12. Sheng Yin & Jimin Ni & Houchuan Fan & Xiuyong Shi & Rong Huang, 2022. "A Study of Evaluation Method for Turbocharger Turbine Based on Joint Operation Curve," Sustainability, MDPI, vol. 14(16), pages 1-18, August.
    13. Serrano, José Ramón & Arnau, Francisco José & García-Cuevas, Luis Miguel & Inhestern, Lukas Benjamin, 2019. "An innovative losses model for efficiency map fitting of vaneless and variable vaned radial turbines extrapolating towards extreme off-design conditions," Energy, Elsevier, vol. 180(C), pages 626-639.
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