| Autor: |
Greco, C. S., Paolillo, G., Astarita, T., Cardone, G. |
| Přispěvatelé: |
Greco, C. S., Paolillo, G., Astarita, T., Cardone, G. |
| Jazyk: |
angličtina |
| Rok vydání: |
2021 |
| Popis: |
Sweeping jets are characterized by an oscillating motion and they are generated by a fluidic oscillator with no moving part [1]. The geometric characteristics of such an oscillator deeply affect the fluid dynamic behavior of the issued sweeping jet. In order to characterize the mean flow field, the oscillating coherent flow field and the turbulent statistics of impinging sweeping jets, phase-locked particle image velocimetry (PIV) measurements are carried out. Several sweeping jet devices have been studied. In particular, three different mixing chamber lengths (2.5w, 3.5w and 4.5w) have been investigated at Reynolds number equal to 6300 and nozzle-to-plate distance (H) ranging between 2 and 10 nozzle width (w). The flow field, for the case characterized by the longest mixing chamber (4.5w) and shortest nozzle-to-plate distance (2w), is reported in figure 1. These results show a double peak distribution of the time-averaged streamwise velocity component U, caused by the oscillation of the sweeping jet, in agreement with the literature, while the time-averaged vertical velocity component V exhibits the typical behavior of a wall jet. The time-averaged phase correlated kinetic energy (PKE) and turbulent kinetic energy (TKE) maps highlight the regions where the coherent and uncoherent fluctuations are stronger. The observed PKE behavior can be explained considering the oscillating nature of the sweeping jet, while the TKE distribution is mainly caused by the presence of the oscillating jet shear layer. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
