Evaluation of synthetic jet actuators design performance

Abstract

Purpose -The purpose of this paper is to evaluate the synthetic jet actuator design's performance based on piezoelectric diaphragms that can be appropriately used for flow separation control. Design/methodology/approach -Design the synthetic jet actuators by means of estimating the several parameters and non-dimensional parameters. Understanding the relationship and coupling effects of these parameters on the actuator to produce exit air jet required. Experiments were conducted to measure the exit air jet velocity using a hot-wire anemometry and determine the good operational frequencies and voltages of the actuators for different cavity volume. Findings -The performance of synthetic jet actuator is not consistent to a particular given frequency and it depends on design configurations. Each actuator will give a very good speed for a certain frequency. The results show that the exit air jet velocity increases would be better if the cavity volume is reduced and if the input voltage is increased to certain limits.Research limitations/implications -The limit of input voltage for the actuators that can be achieved for good jet speed is 2V of about 205V output voltage for each frequency. The jet speed obtained is sufficient enough to control the separation for an aircraft which has a small wing chord and low speed. Therefore, more studies are needed to optimize the sizes of an orifice and cavity, and the selection of piezoelectric diaphragm. Practical implications -The study helps in establishing a flow control device for controlling flow separation, especially on airfoils. Originality/value -Design the synthetic jet actuators based on piezoelectric diaphragm for applications of flow separation control.

Effect of Cavity Volume on Cooling Performance of Synthetic Jet Device

“…The operation of a synthetic jet is based on the intake and ejection of high-velocity working fluid through a single orifice. Zero net mass flux results from the ingress and egress of high-velocity working fluid through a single aperture in synthetic jets [4]. Vortex interaction creates a zero-net-mass-flux jet with non-zero mean stream-wise momentum.…”

“…Synthetic jets have lower noise, power consumption, flexibility, reliability, miniaturisation, and fouling than conventional fans. The oscillating driver plays a crucial role in the synthetic jet because it controls the jet's frequency and strength [2] Common oscillating diaphragm types include motor-driven pistons, piezoelectric diaphragm, and acoustic excitation [4]. It suggests that in this regard, the type of device used to set the fluid in motion (loudspeaker, piezoelectric transducer) is more important than the arrangement of fins in the cavity.…”

Design and analysis of a synthetic jet actuator-based fluid atomization device

“…Deng et al (2014) experimentally determined the dimensionless chamber height, orifice height, and orifice width that resulted in the highest vortex strength. Many other studies have been published on geometry and design, including those by Chaudhari et al (2009), Dahalan et al (2012), Feero et al (2015), Jain et al (2011), and Mane et al (2008). Unfortunately, there are a large number of variables affecting synthetic jet actuator performance and this has made it difficult to gain a clear insight into the effect of geometry.…”