Feedback fluidic flowmeters with curved attachment walls

Meng, Xiangda; Xu, Cong; Yu, Hui

doi:10.1016/j.flowmeasinst.2013.02.006

Cited by 8 publications

(1 citation statement)

References 16 publications

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“…The Sweeping Jet (SWJ) actuator with two feedback channels is one of the most common fluidic oscillator designs, with oscillation frequencies ranging from a few Hertz to several kilo-Hertz. It has been widely studied for many applications, such as: heat transfer enhancement (Wen et al 2019), combustion control (Crittenden andRaghu 2009), cavity tones suppression (Raman and Raghu 2004), noise control (Horne and Burnside 2016), atomizing high-viscosity liquids (Fu et al 2017), flow measurement (Meng et al 2013), dynamic calibration (Gregory et al 2002), boundary-layer control (Seifert et al 1993), and separation control (Wilson et al 2013;Shtendel and Seifert 2014;Schatzman et al 2014;Kara et al 2018), to name just a few. Its most common application in aerodynamics, as an active vortex generator, is based on its production of streamwise vorticity (Woszidlo and Wygnanski 2011) due to the sweeping motion of the external jet.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of a fluidic oscillator to modifications of feedback channel and mixing chamber geometry

2021

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This experimental study investigates the effects of internal geometry modifications on the performance of a curved Sweeping Jet actuator. The modifications are applied to the geometry of the feedback channel and the mixing chamber Coanda surface, and the resulting actuator properties are evaluated using time-resolved static pressure measurements inside the actuator and hot-wire measurements of the external flow. The major result is that small, localized modifications of the curved sweeping jet actuator geometry can lead to a complete change in the external flow regime, making the jet velocity distribution homogeneous, similar to the angled variant of the actuator. The Coanda surface shape is identified as the primary cause of the external jet adopting the bifurcated or homogeneous flow regime. The relationships between the sweeping frequency, jet deflection angle, required supply pressure, and pressure fluctuations are analyzed and discussed in detail. External flow behavior and coherence are characterized by phase-averaged, phase-locked velocity profiles and auto-correlation of the velocity signals. Graphical abstract

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