Continuous control of asymmetric forebody vortices in a bi-stable state
| Autor: | Cheng Keming, Gu Yunsong, Qite Wang, Zhuo-qi Li |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics 020301 aerospace & aeronautics Turbulence Angle of attack Mechanical Engineering Computational Mechanics 02 engineering and technology Mechanics Vorticity Condensed Matter Physics Ogive 01 natural sciences 010305 fluids & plasmas Vortex Physics::Fluid Dynamics Flow control (fluid) 0203 mechanical engineering Mechanics of Materials Duty cycle 0103 physical sciences Turbulence kinetic energy |
| Zdroj: | Physics of Fluids. 30:024102 |
| ISSN: | 1089-7666 1070-6631 |
| DOI: | 10.1063/1.5000006 |
| Popis: | Aiming at the problem of continuous control of asymmetric forebody vortices at a high angle of attack in a bi-stable regime, a dual synthetic jet actuator embedded in an ogive forebody was designed. Alternating unsteady disturbance with varying degree asymmetrical flow fields near the nozzles is generated by adjusting the duty cycle of the drive signal of the actuator, specifically embodying the asymmetric time-averaged pattern of jet velocity, vorticity, and turbulent kinetic energy. Experimental results show that within the range of relatively high angles of attack, including the angle-of-attack region in a bi-stable state, the lateral force of the ogive forebody is continuously controlled by adjusting the duty cycle of the drive signal; the position of the forebody vortices in space, the vorticity magnitude, the total pressure coefficient near the vortex core, and the vortex breakdown location are continuously changed with the duty cycle increased observed from the time-averaged flow field. Instantaneo... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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