Statistical Vortex-Generator-Jet Model for Turbulent Flow Separation Control
| Autor: | Arne V. Johansson, Florian von Stillfried, Stefan Wallin |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | AIAA Journal. 51:1119-1129 |
| ISSN: | 1533-385X 0001-1452 |
| DOI: | 10.2514/1.j051987 |
| Popis: | This contribution describes the development and evaluation of a new statistical modeling approach for active vortex generator jets. Previous experiments from the Technische Universitat Braunschweig and their subsequent evaluation by the present authors showed that the induced flowfield can be reasonably well represented by two-dimensional Lamb–Oseen vortices. Based on that, an analytical expression for the Lamb–Oseen-vortex-model maximum circulation Γmax was derived in terms of the freestream velocity U∞, the jet-to-freestream velocity ratio λ, and the jet skew angle β, as well as the actuator diameter ΦVGJ. Based on the parameterized results, universal values for the Lamb–Oseen-vortex-model parameters at the actuator position were determined for the development of the statistical vortex-generator-jet model. The idea behind the statistical modeling approach is that the vortices are represented by their spanwise-averaged velocity correlations, or vortex stresses, that are added to the turbulence stresses i... |
| Databáze: | OpenAIRE |
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