Abstract
A Mach 2.0 round jet at design and off-design condition is experimentally manipulated using two steady radial injectors to investigate the effect of fluidic injection on jet mixing. A new scaling law for , the supersonic core length of manipulated supersonic free jets, is found as , where is normalized by the nozzle throat diameter , is the specific heats ratio, is the ideally expanded jet Mach number, is the momentum ratio of the individual injector jet to the main jet, and is the expansion ratio of the main jet. The discussion pertaining to the scaling law provides an important insight into the choice of diameter ratio for efficient jet manipulation, where and are the injector and nozzle exit diameters, respectively. Such insight can yield valuable information on the practical usability of fluidic injectors for the full-scale applications. It is also documented that fluidic injectors can provide an effective flow control mechanism for jet mixing applications in comparison to the elliptic jet.
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