Effect of Plane Walls on Flow Characteristics of Primary Jets Controlled by Secondary Flow

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Published: Jun 16, 2024
Keywords:
Jet vectoring Coanda effect Secondary flow Wall boundaries Offset ratio

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H. Tezuka
Mechanical Engineering Program in the Graduate School of Engineering, Kogakuin University, Tokyo 192-0046, Japan
K. Yabu
Department of Mechanical System Engineering, Kogakuin University, Tokyo 192-0046, Japan
K. Nishibe
Department of Mechanical Engineering, Tokyo City University, Tokyo 158-8557, Japan
D. Kang
Department of Mechanical Engineering, Saitama University, Saitama 338-8570, Japan
K. Sato
Department of Mechanical System Engineering, Kogakuin University, Tokyo 192-0046, Japan

Abstract

The method for controlling the direction of primary jets by secondary flow is called fluid thrust vectoring. It was originally studied for application in aircraft attitude control, where it was expected to reduce fuel consumption and improve motion performance. It has been demonstrated that the direction of the primary jet can be adjusted by adjusting the momentum of the secondary flow generated near a curved surface (Coanda surface), such as a cylinder. However, there is limited research applying the abovementioned method to fields such as aviation for flows other than external flows. To use this method for internal flows, such as airflow control in a room, knowledge of the geometric boundaries near the jet flow is required. That is, the interference problem between the jet and wall boundaries must be investigated to realize jet direction control using secondary flows in various fields. Thus, this study investigated the effects of wall length and step height (offset ratio) on the flow characteristics of jets controlled by secondary flow near the Coanda surface. Typical flow patterns are presented in this paper, and the jet deflection characteristics are discussed primarily through flow visualization and velocity distribution measurements.

Article Details

How to Cite
Tezuka, H., K. Yabu, K. Nishibe, D. Kang, & Sato, K. (2024). Effect of Plane Walls on Flow Characteristics of Primary Jets Controlled by Secondary Flow. Journal of Research and Applications in Mechanical Engineering, 12(2), JRAME–24. Retrieved from https://ph01.tci-thaijo.org/index.php/jrame/article/view/254275
Issue
Vol. 12 No. 2 (2024)
Section
RESEARCH ARTICLES
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