Boundary Feedback Flow Control: Proportional Control with Potential Application to Aero-Optics
| Autor: | James H. Myatt, R. Chris Camphouse, Ryan Schmit, Mark Glauser, Ryan Wallace, Marlyn Y. Andino |
|---|---|
| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | AIAA Journal. 49:32-40 |
| ISSN: | 1533-385X 0001-1452 |
| DOI: | 10.2514/1.44742 |
| Popis: | A large percentage of the losses in performance and effectiveness of airborne optical systems are caused by turbulence. In an effort to reduce these adverse effects in airborne optical systems, we are exploring the use of both openand closed-loop flow control over a cylindrical turret. A series of experiments were performed at a Reynolds number of 2 10, based on the turret’s diameter and freestream velocity, which corresponds to aMach number of 0.3. The three-dimensional turret contained an actuation system that consists of 17 synthetic jets placed upstream from the leading edge of the aperture. Initially, a large database containing no control and open-loop control was obtained. These data sets provide a rich ensemble for the development and application of a simple proportional closed-loop control with the use of proper orthogonal decomposition. Surface pressuremeasurements were acquired across the aperture region for all cases studied. Results from the open-loop test demonstrate a reduction of 19.6% in the root-mean-square values when compared to the baseline case. The closed-loop flow control results show that the root-mean-square pressure fluctuations are reduced by 25.7%, the integral scales are significantly reduced, and the flow is driven toward homogeneity. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|