FLOW STUCTURE OF SUPERSONIC UNDEREXPANDED JET WITH MICROJETS INJECTION

Experimental and numerical study of transversal microjets injection influence on the supersonic underexpanded jet flow structure has been performed. Data of measurements and calculation have acceptable agreement. Interaction of microjets with main supersonic jet sets to a decrease of an initial gasdynamic region. Microjets lead to a longitudinal streamwise vortices generation and a mushroom-like flow structures create on an external jet mixing layer. Dissipation of longitudinal streamwise vortices was observed at the second jet cell. Complex gasdynamic flow structure of the supersonic underexpanded jet interacting with supersonic microjets has been studied for the first time. This structure contains system of complex chock waves and expansion waves spreading from the position of the impact microjets/main jet localization place. Future of interaction process a chock-wave structure of main jet with additional shock waves has been studied.

Keywords:
supersonic underexpanded jet, vortex generator, microjets injection, streamwise vortices. 
УДК 533.6.011.5

FLOW STUCTURE OF SUPERSONIC UNDEREXPANDED JET WITH MICROJETS INJECTION