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Interaction of synthetic jets with a massively separated three-dimensional flow field
Phys. Rev. Fluids 7, 034702 – Published 24 March, 2022
DOI: https://doi.org/10.1103/PhysRevFluids.7.034702
Abstract
The interaction of an array of finite span synthetic jet actuators with a massively separated flow was explored experimentally over a cantilevered, swept, and tapered model having a deflected control surface. The synthetic jet actuators were placed slightly upstream of the control surface hinge-line of the wind tunnel model. The flow physics associated with the interaction of multiple jets and the separated crossflow over the control surface was investigated using stereoscopic particle image velocimetry. Experiments were conducted at two spanwise regions along the model, where separation severity varied. At the outboard region, the baseline flow field was characterized by a severe separation that was quasiuniform in the spanwise direction. At the inboard measurement domain, separation was milder but increased in severity in the outboard direction. When a single jet was activated, separation was reduced downstream and outboard of the jet orifice. In addition, spanwise velocity was augmented outboard of the jet's structures at the outboard measurement domain from an oblique vortex that was observed at the spanwise location where separation severity increased (as the flow approached the baseline state). In the inboard region, this vortex was not observed and the spanwise velocity decreased with a single jet active. When more jets were actuated along the span, the overall severity of separation decreased at both locations. Despite this, in the outboard region, the spanwise velocity near the surface was enhanced, and the strength of the jets’ vortical structures decreased as more jets were activated (i.e., they negatively impacted one another). On the contrary, at the inboard region, the jets beneficially affected each other. These differences were hypothesized to be related to the oblique vortices that were distinguishable outboard but not inboard with all jets active.
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