The influence of wake passing frequency and elevated free stream turbulence intensity on transition in low-pressure turbines

Richard W. Kaszeta, Terrence W Simon, Federico Ottaviani, Nan Jiang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Scopus citations

Abstract

Experimental results from a study of the effects of passing wakes upon laminar-to-turbulent transition in a low-pressure turbine passage are presented. The test section geometry is designed to simulate the effects of unsteady wakes resulting from rotor-stator interaction in turbine blade boundary layers and separated flow regions over suction surfaces. Single-wire, thermal anemometry techniques are used to measure timeresolved and phase-averaged, wall-normal profiles of velocity, turbulence intensity and intermittency at multiple streamwise locations over the turbine airfoil suction surface. The Reynolds number based on suction surface length and stage exit velocity is 50,000. This study compares cases of either decreased wake passing frequency or elevated approach flow turbulence intensity to data from a base case. The results show that the decreased wake frequency from that of the base case results in an earlier separation with a larger separation bubble, while data from the elevated FSTI case show an further downstream separation, but a shorter, thinner, separation bubble than observed in the base case.

Original languageEnglish (US)
Title of host publication36th AIAA Thermophysics Conference
StatePublished - 2003
Event36th AIAA Thermophysics Conference 2003 - Orlando, FL, United States
Duration: Jun 23 2003Jun 26 2003

Publication series

Name36th AIAA Thermophysics Conference

Other

Other36th AIAA Thermophysics Conference 2003
CountryUnited States
CityOrlando, FL
Period6/23/036/26/03

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