On the Physics of Flow Separation Along a Low Pressure Turbine Blade Under Unsteady Flow Conditions
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The behavior of the separation zone on the sunction surface of a highly loaded LPT-blade under periodic unsteady wake flow was investigated. One steady and two different unsteady inlet wake flow conditions with the corresponding passing frequencies, wake velocity, and turbulence intensities were also investigated. The results of the unsteady boundary layer measurements were presented in ensemble-averaged and contour plot forms. It was formed that in conjunction with the pressure gradient and periodic wakes the temporal gradients of the turbulence fluctuation δv rms/δt provides higher momentum and energy transfer into the boundary layer energizing the separation zone and causing it to partially or entirely disappear.
author list (cited authors)
Schobeiri, M. T., Öztürk, B., & Ashpis, D. E.