Title: Computational study on the effect of orifice-edge-chamfered angle on the synthetic jet characteristics

Authors: Hong Mun Hoh; Cheng See Yuan; Teo Yong Soon; Lim Kim Chuan

Addresses: Faculty of Mechanical Engineering, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian Tunggal, Melaka, Malaysia ' Centre for Advanced Research on Energy, Faculty of Mechanical Engineering, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian Tunggal, Melaka, Malaysia ' Faculty of Mechanical Engineering, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian Tunggal, Melaka, Malaysia ' Centre of Telecommunication Research and Innovation, Faculty of Electronic and Computer Engineering, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian Tunggal, Melaka, Malaysia

Abstract: The effect of chamfered orifice edges on the time-averaged pressure difference and jet velocity of synthetic jet have been numerically investigated. Chamfered orifice edges with exit angle of 15° and 30° are analysed. Moving grid is utilised to define the moving diaphragm of the actuator. The results are validated against experimental data. The time-averaged pressure difference between the location inside the orifice duct and downstream region where the velocity becomes negligible have been numerically predicted for all the cases. The jet velocity is predicted numerically at the downstream location of 1 mm from the orifice exit. The overall results indicated that the changes of chamfered orifice edges give significant impact on the time-averaged pressure difference. The jet velocity is also affected by the variation of the chamfer orifice edges during the expulsion stage. The findings from this study provides a basic design guideline for designing a synthetic jet actuator with lower minor loss and power dissipation.

Keywords: computational study; orifice edges; synthetic jet characteristics.

DOI: 10.1504/IJESMS.2019.103779

International Journal of Engineering Systems Modelling and Simulation, 2019 Vol.11 No.3, pp.128 - 133

Received: 04 Jul 2018
Accepted: 24 Aug 2019
Published online: 27 Nov 2019 *

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