Characteristics of Sonic Jets with Tabs

Free underexpanded jets in a quiescent medium: A review

“…Their size is of the order of the boundary-layer thickness but increases downstream and with the pressure ratio [157,152,179,165,166,181]. Furthermore, these disturbances tend to amplify initial perturbations due to the nozzle boundary layer or to some features of the nozzle walls, such as the roughness of their inner side that can be connected to the streamwise vortex structures [151,160,162,152,167,169].…”

“…Thus, one may easily find experimental works [66,144,145,[30][31][32]157,70,134,135,[191][192][193][194][195][196][197][198][199][200][201][202][203][204][205][206][207]148,151,35,77,38,39,15,64,40,142,82,123,159,42,127,59,55,51,87,60,122,150], as well as theoretical ones [133,74,…”

“…increased for larger pressure ratios [143][144][145]149,121,150]; increased with the exit Mach number [149]; reduced when there occurs an enhancement of the turbulence, and so depends on the Reynolds number, which induces a rapid mixing of the high-velocity flows with the ambient fluid since we may have a thicker shear layer [144,148,[151][152][153][154]38,61].…”

Triangular tabs for supersonic jet mixing enhancement

“…For the rectangular tab the half-width is uniform all along the tab length from the root end to the tip end. Therefore the tab would shed mixing promoting vortices of only uniform size all along its edges, excepting the tip where there are are two sharp corners (61) , M d = 1•0); ▼ -no control, and ▽ -grooves (Krothapalli et al (28) , M d = 1•0); ⊟ -no control, × -microjets with φ j = 0•02 and + -microjets with φ j = 0•04 (Mohammed K Ibrahim et al (5) , M d = 1•0); ◂ -no control, and ◁ -rectangular tabs (Shibu Clement and Rathakrishnan (105) , M d = 1•0); -no control, and -square grooves (Mrinal et al (37) , M d = 1•0); -no control, -rectangular tabs, and -rotating rectangular tabs (Mohammed K Ibrahim., and Yoshiaki Nakamura (106) , M d = 1•35); ★ -no control, and ☆rectangular tabs (Samimy et al (58) , M d = 1•35); + -no control (Munday et al (99) , M d = 1•5); ▸ -no control, and ▷ -rectangular tabs (Chiranjeevi and Rathakrishnan (102) , M d = 1•8); ◐ -no control, and ◑ -square grooves (Vishnu and Rathakrishnan (36)…”

“…The core length of uncontrolled and controlled jet and percentage reduction in core reduction of controlled jets over uncontrolled jets at different expansion ratios are tabulated in Table 3. (61) , M d = 1•0); ▽ -grooves (Krothapalli et al (28) , M d = 1•0); × -microjets with φ j = 0•02 and + -microjets with φ j = 0•04 (Mohammed K Ibrahim et al (5) , M d = 1•0); ◁ -rectangular tabs (Shibu Clement and Rathakrishnan (105) , M d = 1•0); -square grooves (Mrinal et al (37) , M d = 1•0); -rectangular tabs, and -rotating rectangular tabs (Mohammed K Ibrahim., and Yoshiaki Nakamura (106) , M d = 1•35); ☆ -rectangular tabs (Samimy et al (58) , M d =1•35); ▷ -rectangular tabs (Chiranjeevi and Rathakrishnan (102) , M d = 1•8); ◑ -square grooves (Vishnu and Rathakrishnan (36) , M d = 1•8); ▲ -delta tabs with sharp vertex, and ♦ -delta tabs with truncated vertex (Arun Kumar and Rathakrishnan (71)…”