Flow-Direction Control of Primary Jets Near a Wall Boundary Using Secondary Flow with a Coanda Surface

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Published: Sep 4, 2023
Keywords:
Jet vectoring Coanda effect Secondary flow Synthetic jets Frequency

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H. Tezuka
Mechanical Engineering Program in the Graduate School of Engineering, Kogakuin University, Tokyo 192-0046, Japan
Q. Zhang
Mechanical Engineering Program in the Graduate School of Engineering, Kogakuin University, Tokyo 192-0046, Japan
K. Nishibe
Department of Mechanical Engineering, Tokyo City University, Tokyo 158-8557, Japan
K. Sato
Department of Mechanical System Engineering, Kogakuin University, Tokyo 192-0046, Japan

Abstract

Fluidic thrust vectoring, a method for controlling jet direction with no moving parts, has attracted attention as it does not require changing the geometry of the device, thus reducing the number of parts in the device. The application of synthetic jets as secondary flows has recently been proposed to adjust the deflection angle arbitrarily. However, studies regarding the relationship between the plane wall boundary and the flow characteristics of jets while applying fluidic thrust vectoring are scarce. In this study, we applied synthetic jets generated by a speaker to a secondary flow with a Coanda surface. We elucidated the influence of the oscillation characteristics of the secondary flow on the deflection angle of the primary jets near a plane wall. By adjusting the dimensionless frequency, the jet deflects toward the opposite side of the plane wall surface, even for the jet near the plane wall surface.  In this condition range, we can set the maximum jet deflection angle to approximately 20 deg when the momentum ratio between the primary and secondary flow at slot is 0.08 and dimensionless frequency 0.11.

Article Details

How to Cite
Tezuka, H., Zhang, Q. ., Nishibe, K. ., & Sato, K. . (2023). Flow-Direction Control of Primary Jets Near a Wall Boundary Using Secondary Flow with a Coanda Surface. Journal of Research and Applications in Mechanical Engineering, 11(2), JRAME–23. Retrieved from https://ph01.tci-thaijo.org/index.php/jrame/article/view/251425
Issue
Vol. 11 No. 2 (2023)
Section
RESEARCH ARTICLES
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