Effect of pressure gradients on a confined turbulent plane wake
Chitrarth Lav, University of Melbourne
Jimmy Philip, University of Melbourne
Richard Sandberg, University of Melbourne
DOI: [ Ссылка ]
Efficiency of gas turbines is directly related to the loss produced; minimising loss leads to increase in efficiency. Once such source of loss is from wake mixing under the presence of pressure gradients. We simply the problem by exposing a wake to a region of constant pressure gradients to understand the underlying physics. Performing direct numerical simulations (DNS), the obtained results show that a wake in favourable pressure gradient enhances wake mixing, drawing energy from the turbulence to accelerate the flow and consequently reducing the loss by lowering the amount of entropy produced. An adverse pressure gradient on the other hand draws energy from the mean to the turbulent scales, increasing the amount of entropy produced and thus the loss.
See other videos from the 2019 Gallery of Fluid Motion: [ Ссылка ]
