| Autor: |
Nazri MD DAUD, Yasuaki KOZATO, Satoshi KIKUCHI, Shigeki IMAO |
| Jazyk: |
angličtina |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Journal of Fluid Science and Technology, Vol 9, Iss 3, Pp JFST0049-JFST0049 (2014) |
| Druh dokumentu: |
article |
| ISSN: |
1880-5558 |
| DOI: |
10.1299/jfst.2014jfst0049 |
| Popis: |
This study deals with the separation control of an airfoil when a dielectric barrier discharge (DBD) plasma actuator is mounted on its leading edge. The experiments were performed at Reynolds number, Re ≈ 67,000 in an external airflow of 10 m/s. The DBD plasma actuator was installed at x/c = 0.025 of a NACA0015 airfoil with a 100-mm chord and 150-mm width. Flow visualization, lift force and velocity measurements were conducted with on and off modes of the actuator (pulse-modulated drive). We found that the application of pulse modulation condition was able to delay a stall up to angle of attack α =17° compared to the Duty = 100% (α =15°). At α =17°, the maximum lift coefficient Cl was obtained for a non-dimensional pulse modulation frequency St of 4.0. With an increase in α, the lift coefficient Cl decreases sharply after reaching a maximum, which is entirely different from the case of St = 0.6, where the value of Cl falls gradually. For a high angle of attack (α =18°) that exceeds the maximum Cl, St = 0.6 produces a better lift improvement than when St = 4.0. Our results showed that the separation when St = 4.0 is larger than that when St = 0.6. In addition, we also found that there is an optimum actuation time of about 0.25 ms. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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