Flow structure, wall pressure and heat transfer characteristics of impinging annular jet with/without steady swirling

Impingement pressure characteristics of swirling and non-swirling turbulent jets

“…Apart from experimental investigations into the surface pressure distribution of annular swirling jets [27,28], which impose fundamentally different flow behaviour due to multiple shear layers, there is little data for pressure distributions of turbulent swirling jets. Most swirling impinging jet studies largely deal with the mean and turbulent velocity characteristics upstream of the impingement surface [16,[29][30][31][32][33].…”

“…Aerodynamic swirl generation helps avoid trailing vortices from radial vanes [33] and allow a seamless transition from non-swirling to swirling jet flows. In addition, this technique avoids the complications arising from dead (central) ribs associated with geometrical swirl generation [16,27]. Aerodynamic swirl generator design adopted here allows varying swirl numbers independent of Reynolds number to be tested.…”

Visualization of flow and heat transfer characteristics for swirling impinging jet

“…Heat transfer from a flat surface to each impinging jet was investigated and correlation of the average Nusselt number has been derived as a function of nozzle exit-to-plate distance and Reynolds number for all nozzle types. Yang et al [10] demonstrated detailed impinging annular jet behaviors induced by a swirling motion. They reported that at a short and intermediate separation distances (jetto-surface distance), swirling annular jet provided non-uniform wall pressure and Nusselt number distributions on the impinged surface.…”

Numerical investigation of the simultaneous influence of swirling flow and obstacles on plate in impinging jet

“…They also showed that the best result was occur at θ=50 °a nd b/D=14. Yang et al [12] demonstrated detailed annular impinging jet behaviors induced by a swirling motion. They reported that at a short and intermediate b/D, annular swirling jet provided nonuniform wall pressure and Nusselt number distributions on the impinged surface.…”