Jet Mixings of Alternating-Lobe Nozzles under Pumping Air Intake and Stamping Air Intake Conditions

Jet mixings of a coplanar alternating-lobe nozzle (CoALN), scarfing (ScALN), sword (SwALN), and chevron (SwChALN) were numerically investigated using three different far-field velocities to simulate the conditions pumping air intake stamping intake. It was confirmed that can be introduced increase cool involved in mixing for an infrared suppressor helicopter. found increases amount stream near tube, which effectively decrease temperature thus improving suppression performance. Under two conditions, normal with short SwALN SwChALN are recommended; however, integrated long CoALN ScALN should adopted. The shape longitudinal vortices is closely related large-scale heat mass convection. plumper bring faster affected region.