Energy transfers between aerodynamic and acoustic fields in a rectangular impinging jet

Assoum, Hassan; Hamdi, Jana; Hassan, Mouhammad El; Mrach, Tarek; Meraim, Kamel Abed; Sakout, Anas

doi:10.1016/j.egyr.2020.03.009

Cited by 3 publications

(1 citation statement)

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“…In certain configurations, impinging jets could produce a high level of noise, causing acoustic discomfort [22][23][24][25][26]. As a result, a passive control system that involves an insertion of a thin rod of 4 mm diameter into the jet's flow to minimize noise generation was employed in a previous study [27].…”

Section: Introductionmentioning

confidence: 99%

Combined Stereoscopic Particle Image Velocimetry Measurements in a Single Plane for an Impinging Jet around a Thin Control Rod

Alkheir

Assoum

Afyouni

et al. 2021

Fluids

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Impinging jets are of high interest in many industrial applications and their flow dynamics has a complex three-dimensional behavior. These jets can result in a high noise generation leading to acoustic discomfort. Thus, a passive control mechanism which consists of introducing a thin rod in the flow of the jet is proposed in order to reduce the noise generation. The stereoscopic particle image velocimetry (SPIV) technique is employed to measure the three velocity components in a plane. An experimental difficulty is encountered to acquire images of the flow in the shadow of the rod which block a part of the field of interest. In this paper, an experimental arrangement is proposed in order to overcome this experimental difficulty using a combined SPIV technique denoted by (C-SPIV). This technique consists of using an inclined mirror to illuminate the area under the rod by reflecting the laser light and two independent systems of SPIV synchronized and correlated together in order to obtain the combined field of velocity in the same plane above and below the rod. The C-SPIV measurements allowed to obtain the kinematic field in the whole area of interest. Thus, vortex shedding frequency, Turbulent Kinetic Energy were calculated and analyzed along with the acoustic signal. These results are of high interest when seeking for noise reduction in such jet configuration.

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