Fig 6 - uploaded by Avraham Seifert
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Several of the actuator BC used. Origin of axis system is at slot exit.
Source publication
The effects of boundary conditions on the performance of compact, zero-mass-flux, oscillatory momentum and vorticity generators (OMVG's) were studied experimentally. The slot exit boundary conditions allowed unrestricted and restricted entrainment. The excitation signals included a pure sine wave (as a reference) and amplitude modulated sine wave,...
Contexts in source publication
Context 1
... slot exit area, =hb b actuator span F+ Strouhal number; h slot height, L stroke length, 2D expulsion volumetric flow, per slot width Re Reynolds number, Vac RMS excitation voltage Tm input signal modulation period Tr period of actuators’ sine wave fr actuators resonance frequency fm modulating frequency f excitation frequency. Either fm or fr depends on excitation type p instantaneous local pressure u` R.M.S of velocity fluctuations Up peak slot exit velocity u,v,w velocity components in the x,y,z directions x,y,z Cartesian coordinates. see Fig. 6 kinematic viscosity phase angle of excitation cycle Abbreviations HW hot-wire PIV Particle Image ...
Context 2
... 1mm wide by 135mm long. The actuator to be discussed here ejected the excitation normal to the wall on which it was installed (see Fig. 6 for a sketch of the boundary conditions)). Fig. 3 shows a picture of this actuator installed in a small wind tunnel test section (Ref. 25). Note that there is a major difference between the boundary conditions of the compact actuator and the plate inserted actuator, namely a 360° vs. 180° in-plane suction into the slot and fluid entrainment capability during the ejection stage. However, the resulting flow fields were quite similar. Unsteady pressure and temperature were measured in the actuators’ cavities. Indications of the actuator membrane displacements were measured for ...
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