Abstract
Two-dimensional unsteady numerical simulation was carried out to investigate the flowfields surrounding a synthetic jet actuator and its effect on the mixing in coaxial jets. The synthetic jet flowfield and the coaxial jets flowfield were investigated. The results show synthetic jet comprises a series of vortex pairs, which distribute around the centerline symmetrically. Its frequency keep same to the actuator's frequency. This is a disturbed force for the outer flowfield. The movement velocity of vortex pairs is nearly constant. The formation and development of the outer flowfield have the same rule as that of the inner flowfield. But they are opposite to each other at the certain moment. As a result of actuating device, the centerline velocity distribution shows that the amplitude decreases gradually, which represents the radical characteristic of vorticity development. The mixing ratio of coaxial jets increases comparatively because of the synthetic jet actuators, and the mixing effects in coaxial jets also become more agreeable.
| Original language | English |
|---|---|
| Pages (from-to) | 5-9 |
| Number of pages | 5 |
| Journal | Beijing Hangkong Hangtian Daxue Xuebao/Journal of Beijing University of Aeronautics and Astronautics |
| Volume | 33 |
| Issue number | 1 |
| Publication status | Published - Jan 2007 |
| Externally published | Yes |
Keywords
- Mixing
- Shear stress
- Synthetic jet
- Vortex pair