Synthetic jet Reynolds number based on reaction force measurement

Gil, Paweł

doi:10.1016/j.jfluidstructs.2018.05.011

Cited by 24 publications

(19 citation statements)

References 29 publications

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“…1. In this study the resolution of force measurement prevented accurate measurement of this forces but Trávníček et al (2005), Trávníček et al (2008) and Gil (2018) investigated experimentally SJA force and obtained maximum 10-35 mN. This result was obtained in an undisturbed field, whereas in this case there is an external air flow close to SJA.…”

Section: Discussionmentioning

confidence: 92%

Bluff Body Drag Control using Synthetic Jet

Gil¹,

Aeronautics²

2019

JAFM

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The paper presents the results of an experimental investigation wherein the bullet form drag force as a function of oscillating actuator frequency, various voltage and for different orifice/slot configuration are studied. In order to perform the experiment, an axisymmetric bullet shape model with ellipsoidal nose was used in wind tunnel. The synthetic jet actuator was used to flow control at sharp cut end. The experiment was conducted in a wind tunnel with a working diameter of 1000 mm and a maximum velocity of 45 m/s. The measurements were carried out for the Reynolds number from 88000 to 352000 and for relatively large Strouhal numbers up to St = 4.5 based on model external diameter and free stream velocity. While synthetic jet was switched on, drag coefficient has been reduced by-6% and increased by +22% in relation to the case with the synthetic jet was switched off. The synthetic jet has more impact for relatively low free stream velocity and for single axisymmetric orifice.

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Section: Discussionmentioning

confidence: 92%

Bluff Body Drag Control using Synthetic Jet

Gil¹,

Aeronautics²

2019

JAFM

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“…where Dn is the nozzle diameter, υ is the kinematic viscosity of the working fluid (υ = 1.82•10 −5 m 2 •s −1 , air). Among others, non-dimensional parameters used for the SJ description should be mentioned: Strouhal number St and Stokes number S, defined as follows [26,29]:…”

Section: Parametersmentioning

confidence: 99%

Synthetic jet actuator with two opposite diaphragms

Smyk

Wawrzyniak

Peszyński

2020

Mechanics and Mechanical Engineering

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The synthetic jet actuators are one of the most investigated types of actuators used in heat transfer and active flow control. The energetic efficiency of actuators is a key parameter determining the possibility of device use. The actuators with two or more diaphragms have higher efficiency than the actuators with only one. The paper presents the investigations of the acoustic synthetic jet actuator with two opposite diaphragms. In the paper, synthetic jet velocity, Reynolds number and the energetic efficiency as a function of oscillating actuator frequency, for a different cavity, orifice configuration and one real input power P0 = 2 W were studied. The possibility of theoretical calculation of first and second resonance frequency were checked. The coupling ratio for actuators was calculated. The maximum energetic efficiency was η = 8.67% and Reynolds number Re = 8503. The possibility of using the same dependencies and rules during the design of actuators with two opposite diaphragms as in the case of actuators with one diaphragm was demonstrated. The results may be useful in the design of the actuators of the two membranes.

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“…1 -dotyczy rury zewnętrznej, 2 -dotyczy rury wewnętrznej, 3 -dotyczy wymiaru bazowego ożebrowania, 4 -dotyczy wymiaru zewnętrznego ożebrowania, b -dotyczy ożebrowania, przejm. -dotyczy przejmowania ciepła, przew.…”

Section: Indeksyunclassified

“…Są jednak możliwe inne sposoby mieszania, jak np. przy wykorzystaniu strugi syntetycznej [3], ultradźwięków [4] lub wyładowań elektrycznych [5]. Wymienniki ciepła z powierzchniami ożebrowanymi znajdują szerokie zastosowanie w wielu gałęziach przemysłu, np.…”

Section: Wprowadzenieunclassified