Abstract
Synthetic jets are currently in the focus of attention as means for flow control in external aerodynamics. Less known and studied is their use in internal aerodynamics, where several existing papers discussed separation control in diffusers. The subject of this paper, however, is a completely new idea — using the synthetic jet in flow control valves having no moving components. The valve considered would operate as a bistable diverter: by the action of the synthetic jet, the controlled fluid is deflected into one of available two flowpaths. A preliminary experiment performed with an axisymmetric valve version demonstrated viability of the idea.
Highlights
Characteristic feature of present-day fluid mechanics is shifting the emphasis of analysed problems
Available comparisons show unequivocal effectiveness advantage of periodic jets over their steady counterparts and this development towards higher unsteady component of the jet flow has resulted in the recent interest concentrating on the case of synthetic jets [2], with the purely alternating nozzle flow – i.e. zero time-mean flow component, Fig. 1
The present paper aims at the use of synthetic jets in internal aerodynamics, but this use is based on a completely new idea — for control of fluid flows in diverter valves having no moving components
Summary
Characteristic feature of present-day fluid mechanics is shifting the emphasis of analysed problems. E.g., with the attempts at power transfer by alternating flow it was found possible to perform the rectification of the alternating flow into the steady output by the innate nonlinear properties of jet flows [3] It is this rectification effect that produces the synthetic jet (in the sense of being synthesized from the individual vortex ring generated at each outflow part of the period) as a flow applicable for the action suppressing boundary layer separation or control transition into turbulence [1, 4] or perhaps even decrease turbulent friction drag by suppressing the hairpin vorteces in turbulence. The present paper aims at the use of synthetic jets in internal aerodynamics, but this use is based on a completely new idea — for control of fluid flows in diverter valves having no moving components
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