Large-Eddy Simulation of Low-Pressure Turbine Cascade with Unsteady Wakes

To better understand the wake effects at low Reynolds numbers, large-eddy simulations of a 50% reaction low-pressure turbine stage and linear cascade with two different bar generators were carried out for chord number 50,000. For chosen front-loaded high-lift airfoil, endwall structures are stronger than more traditional mid-loaded moderate-lift airfoils. By comparing results generator results, insight is gained into effect three-dimensional components on downstream flow field.For cases generator, boundary layer growing faster because relative motion respect to freestream. The half-width approximately matched larger one considered generators. improve quality phase-averaged fields, proper orthogonal decomposition was employed as filter remove low-energy unsteady field content. Both mean filtered fields analyzed in detail. Visualizations reveal periodic suppression laminar suction side separation from airfoil even smaller generator. passage vortex entirely suppressed Furthermore, data new longitudinal structure that traced back near-wall vorticity. This missing cases.