Analysis of radial migration of hot-streak in swirling flow through HP turbine stage

B. Khanal, L. He, J. Northall, P. Adami

    Research output: Chapter in Book/Report/Conference proceedingConference proceedingpeer-review

    12 Citations (Scopus)


    The high pressure (HP) turbine is subject to inlet flow non-uniformities resulting from the combustor. A lean-burn combustor tends to combine temperature variations with strong swirl and, although considerable research efforts have been made to study the effects of a circumferential temperature non-uniformity (hot-streak), there is relatively little known about the interaction between the two.

    This paper presents a numerical investigation of the transonic test HP stage MT1 behaviour under the combined influence of the swirl and hot-streak. The in house Rolls-Royce HYDRA numerical CFD suite is used for all the simulations of the present study. Baseline configurations with either hot-streak or swirl at the stage inlet are analyzed to assess the methodology and to identify reference performance parameters through comparisons with the experimental data. Extensive computational analyses are then carried out for the cases with hot-streak and swirl combined including both the effects of the combustor-NGV clocking and the direction of the swirl. The present results for the combined hot-streak and swirl cases reveal distinctive radial migrations of hot fluid in the NGV and rotor passages with considerable impact on the aerothermal performance. It is illustrated that the blade heat transfer characteristics and their dependence on the clocking position can be strongly affected by the swirl direction. A further computational examination is carried out on the validity of a superposition of the influences of swirl and hot-streak. It shows that the blade heat transfer in a combined swirl and hot-streak case cannot be predicted by the superposition of each in isolation.
    Original languageEnglish
    Title of host publicationProceedings of the ASME Turbo Expo
    Number of pages13
    ISBN (Print)978-0-7918-4474-8
    Publication statusPublished - 2012
    EventASME Turbo Expo 2012: Turbine Technical Conference and Exposition - Copenhagen, Denmark
    Duration: 11 Jun 201215 Jun 2012


    ConferenceASME Turbo Expo 2012


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