| Popis: |
Transport aircraft performance is strongly influenced by the effectiveness of the high-lift system. Wakes subjected to strong adverse pressure gradients in high-lift systems can thicken very rapidly, limiting maximum lift. A combined experimental and computational investigation has been conducted to evaluate performance of several turbulence models in simulating this type of flow. In the experiment, a turbulent wake was subjected to adverse pressure gradients in a symmetric diffuser. LDV surveys, pressure measurements, and flow visualization were used to investigate the physics of this decelerated wake, through the onset of wake reversal. NavierStokes calculations were also performed for a flat plate wake in a two-dimensional diffuser. For diffuser angles similar to the experiment, the calculations under-predicted wake growth and failed to demonstrate wake reversal. |
