Structure of supersonic jets with vortex generators at the nozzle exit

Shock-Wave Structure of Supersonic Jet Flows

“…The experimentally obtained contour lines of total pressures measured in various cross-sections of a jet emanating from a nozzle provided with chevrons are shown in Figure 7; here, results of numerical calculations comply with the experimental data of Reference [40]. As a result of the interaction of chevrons with the jet flow, the transformation of the steady-state jet structure and the formation of mushroom-like large-scale vortical structures were registered.…”

“…Figure 6. Flow structure in a supersonic underexpanded jet exhausting from a nozzle without a vortex generator (left) and from a nozzle with six chevrons applied at the nozzle exit (right) [40].…”

Influence of straight nozzle geometry on the supersonic under-expanded gas jets

“…3. Schematic of (a) streamlines and (b) distribution of total pressure in the cross section of an under-expanded gaseous jet near the nozzle (Zapryagaev et al, 2010).…”

“…The study of He et al (2015) describes the characteristics of a supersonic free jet into a liquid through a rectangular nozzle. It is more challenging to observe the Taylor Görtler instability in a shear layer between the nozzle and Mach disk (Arnette et al, 1993;Zapryagaev et al, 2010). In a cross section, the Taylor Görtler vortices are arranged in counter rotating pairs (Görtler, 1954) so that the total pressure distribution looks like a flower petals arrangement (Zapryagaev et al, 2010) (see Fig.…”

“…3). Downstream, the development and the merging of these vortices lead to a decrease in their number (Zapryagaev et al, 2010). The Görtler number is the ratio between the centrifugal force and the viscous force in the shear layer, defined as:…”