A Comparison of the Flow Structures and Losses Within Vaned and Vaneless Stators for Radial Turbines

A.T. Simpson, Stephen Spence, John Watterson

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)
22 Downloads (Pure)


This paper details the numerical analysis of different vaned and vaneless radial inflow turbine stators. Selected results are presented from a test program carried out to determine performance differences between the radial turbines with vaned stators and vaneless volutes under the same operating conditions. A commercial computational fluid dynamics code was used to develop numerical models of each of the turbine configurations, which were validated using the experimental results. From the numerical models, areas of loss generation in the different stators were identified and compared, and the stator losses were quantified. Predictions showed the vaneless turbine stators to incur lower losses than the corresponding vaned stator at matching operating conditions, in line with the trends in measured performance.. Flow conditions at rotor inlet were studied and validated with internal static pressure measurements so as to judge the levels of circumferential nonuniformity for each stator design. In each case, the vaneless volutes were found to deliver a higher level of uniformity in the rotor inlet pressure field. [DOI: 10.1115/1.2988493]
Original languageEnglish
Article number031010
Pages (from-to)1-15
Number of pages15
JournalJournal of Turbomachinery
Issue number3
Publication statusPublished - Jul 2009

ASJC Scopus subject areas

  • Mechanical Engineering


Dive into the research topics of 'A Comparison of the Flow Structures and Losses Within Vaned and Vaneless Stators for Radial Turbines'. Together they form a unique fingerprint.

Cite this