Conference proceeding
Experimental Study of Novel Synthetic Jets Induced by Dynamic Deformable Surfaces
AIAA AVIATION FORUM AND ASCEND 2025
01/01/2025
DOI: 10.2514/6.2025-3393
Abstract
Synthetic jets (SJs), as a promising approach to active flow control, are typically generated by the dynamic oscillation of rigid surfaces within a surface cavity through unsteady flow separation at the cavity orifice. SJs can be induced by the oscillation of dynamically deformable surfaces (DDS) without the need of unsteady flow separation, which possess unique fluid dynamic characters for flow control purposes. This study investigates the effects of two different DDS designs, including a free-slip air-water interface (referred as interface DDS) and a thin deformable elastic membrane (referred as membrane DDS) on the performance characteristics of DDS-based SJs. The two configurations are systematically compared, with pressurized air and water selected as the working fluid within the cavity, respectively. Time-resolved 2D Particle Image Velocimetry (PIV) and qualitative flow visualizations were employed to demonstrate the physics of these two DDS-based SJs. Flow pathline visualizations reveal that the interface DDS deforms more readily than the membrane DDS with a lower actuation power, which results in more energy-efficient jets. The phaseaveraged velocity in the near-field of DDS for both configurations exhibit distinct oscillation modes, with characteristics resembling Bessel-type oscillations; notably, oscillations involving stronger curvature deformations result in higher centerline velocities and stronger jet vorticity. The dimensionless stroke length (...) of DDS-SJs was much lower than the conventional SJs, indicating a reduced excitation threshold and a departure from the established SJ scaling laws. These findings provide deeper insights into the dynamics of DDSSJs and underscore their potential for cross-disciplinary applications, such as turbulence control and biomimetic propulsion. While the interface-based actuator is less suitable for submerged applications, it offers advantages in surface flow control. The membrane-based actuator, with its durability and tunable response, shows promise for underwater propulsion, turbulent drag reduction, and adaptive flow devices.
Details
- Title: Subtitle
- Experimental Study of Novel Synthetic Jets Induced by Dynamic Deformable Surfaces
- Creators
- Skinder Ali Dar - University of IowaChukwudum N. Eluchie - University of IowaZhanghe Wang - Univ Iowa, Iowa City, IA 52242 USAPaloma Garcia-Guillen - Ludwig-Maximilians-Universität MünchenCong Wang - University of Iowa
- Resource Type
- Conference proceeding
- Publication Details
- AIAA AVIATION FORUM AND ASCEND 2025
- DOI
- 10.2514/6.2025-3393
- Publisher
- Amer Inst Aeronautics & Astronautics
- Number of pages
- 11
- Language
- English
- Date published
- 01/01/2025
- Academic Unit
- IIHR--Hydroscience and Engineering; Mechanical Engineering
- Record Identifier
- 9985112975102771
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