CUED Publications database

An investigation of boundary layer development in a multistage LP turbine

Hodson, HP and Huntsman, I and Steele, AB (1994) An investigation of boundary layer development in a multistage LP turbine. Journal of Turbomachinery, 116. pp. 375-383. ISSN 0889-504X

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This paper describes an investigation of the behavior of suction surface boundary layers in a modern multistage Low-Pressure turbine. An array of 18 surface-mounted hot-film anemometers was mounted on a stator blade of the third stage of a fourstage machine. Data were obtained at Reynolds numbers between 0.9 × 10 5 and 1.8 × 10 5 . At the majority of the test conditions, wakes from upstream rotors periodically initiated transition at about 40 percent surface length. In between these events, laminar separation occurred at about 75 percent surface length. Because the wake-affected part of the flow appeared to be only intermittently turbulent, laminar separation also occurred at about 75 percent surface length while this flow was instantaneously laminar. At all but the lowest Reynolds numbers, the time-mean boundary layer appeared to have re-attached by the trailing edge even though it was not fully turbulent. It is inferred that the effect of the wakes on the performance of the blade row is limited and that steady flow design methods should provide an adequate assessment of LP turbine performance during design. © 1994 ASME.

Item Type: Article
Divisions: Div A > Turbomachinery
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:31
Last Modified: 03 Aug 2017 03:05