Abstract
The periodic ingestion and ejection of fluid through an orifice yield vortex rings forming an unsteady jet. The ability to impart momentum with a zero net mass flux makes synthetic jet actuators coveted components in flow control applications. Previous studies underlined the influence of geometrical parameters on synthetic jet evolution. This investigation introduces the orifice lip ratio as a new geometric variation that can influence the performance of the jet. We assess the sensitivity of synthetic jet efficiency to this parameter. Comparisons of test configurations establish the lip ratio as a pivotal parameter and indicate noticeable differences in the exit velocity. The results also highlight the dependence of the jet formation criterion on the orifice lip ratio. The analysis conclusively demonstrates the significance of the orifice lip ratio in the design and optimisation of synthetic jet actuators.
Highlights
The field of active flow control has experienced unprecedented growth over the past decades, largely attributed to the expanding knowledge of fluid mechanics as well as the advent of novel control strategies (Cattafesta and Sheplak 2011)
An experimental investigation was carried out to tackle necking in high aspect ratio (AR) orifices
The influence of the internal orifice geometry on such a problem was studied by introducing a novel concept defined as the orifice lip ratio
Summary
The field of active flow control has experienced unprecedented growth over the past decades, largely attributed to the expanding knowledge of fluid mechanics as well as the advent of novel control strategies (Cattafesta and Sheplak 2011). This investigation focuses on synthetic jet actuators (SJAs) and discusses the importance of the orifice internal geometry in enhancing the mean blowing velocity of the jet. Performance enhancement can be achieved by optimising the fluidic properties, driver properties and actuator geometry, as categorised by Feero et al (2015). Performance enhancement can be achieved by optimising the fluidic properties, driver properties and actuator geometry, as categorised by Feero et al (2015). Ugrina and Flatau (2004) and Holman et al (2005) found the orifice diameter, the nozzle length, the radius of curvature of the outer orifice edge and cavity volume to be key geometrical aspects affecting the performance of the actuator. Gallas et al (2003) found that the actuator response depends on the relative position of the cavity and diaphragm resonance while Glezer and Amitay (2002) and Chaudhari et al (2009) improved the effectiveness by ensuring the diaphragm and cavity are driven at a coupled resonance
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