Effect of volute geometry on the steady and unsteady performance of mixed-flow turbines

I. Hakeem, C. C. Su, A. Costall, R. F. Martinez-Botas

Research output: Contribution to journalArticlepeer-review

34 Citations (SciVal)


The steady and unsteady performance of two mixed-flow turbocharger turbine rotors has been investigated. These rotors differ mainly in their inlet blade angle geometry; one has a constant blade angle (rotor A) and the other a notionally constant incidence angle (rotor B). The results indicate that the constant blade inlet angle design offers improved efficiency characteristics over the constant incidence one with total-to-static efficiency at the design point ranging between 0.7 and 0.76. A detailed assessment of the influence of volute geometry on the turbine performance has been carried out, which confirmed that the geometry of volute plays a critical role in the overall performance of a turbine. The unsteady performance tests have indicated a substantial deviation from the performance and flow characteristics of equivalent steady-state tests, which is quantified and discussed.

Original languageEnglish
Pages (from-to)535-550
Number of pages16
JournalProceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy
Issue number4
Publication statusPublished - Jun 2007


  • Mixed-flow turbines
  • Steady and unsteady performance
  • Volute

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Mechanical Engineering


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