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A numerical and experimental investigation of the effects of flow ratio on the flow and performance characteristics of a twin entry radial turbine

Shahhosseini, M. R ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1115/GT2011-46308
  3. Abstract:
  4. In this paper, a numerical and experimental investigation of the performance and internal flow field characteristics of the twin-entry radial inflow turbine under full and partial admission conditions are presented. The turbine is tested on a turbocharger test facility which was developed for small and medium size turbochargers. The flow pattern in the volute and impeller of a twin-entry turbine is analyzed using a fully three-dimensional viscous program. The computational performance results are compared with the experimental results, and good agreement is found. The flow field at the outlet of the turbine is investigated using a five-hole pressure probe. Numerical and experimental results are obtained for both full and partial admission conditions. In the volute, results show that the highest entropy gain factor belongs to the tongue. In the inlet of the rotor, a large variation in the incidence angle is displayed at the extreme conditions, leading to large incidence losses. Entropy distribution contours at the rotor exit plane are evaluated. For full admission, the location of low entropy gain at this plane occupies a region near the shroud and near the hub pressure surface corner which corresponded to a region of high absolute flow angle. Results show that the entropy gain factor patterns do not have appreciable differences at full and partial admission conditions when more flow is located at the volute shroud side. However, in the extreme cases low entropy gain at the shroud side occupies a relatively large region, and this region is increased when shroud side volute is fully closed
  5. Keywords:
  6. Computational performance ; Entropy distribution ; Entropy gain ; Exit planes ; Experimental investigations ; Extreme conditions ; Flow angles ; Flow ratios ; Incidence angles ; Internal flow field ; Large regions ; Low entropy ; Medium size ; Performance characteristics ; Pressure probes ; Pressure surface ; Radial inflow turbine ; Radial turbines ; Exhibitions ; Flow fields ; Superchargers ; Turbines
  7. Source: Proceedings of the ASME Turbo Expo, 6 June 2011 through 10 June 2011 ; Volume 7, Issue PARTS A, B, AND C , 2011 , Pages 2139-2153 ; 9780791854679 (ISBN)
  8. URL: http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1634147