Abstract
Transverse injection of sonic jets with circular and elliptical cross sections into a M = 1.98 flow have been experimentally investigated using Planar Doppler Velocimetry (PDV). The PDV technique illuminates the flow with the second harmonic of an injection seeded Nd:YAG laser which is tuned, in frequency, to an absorption line of iodine. By placing a pressure broadened iodine molecular filter in front of the camera the instantaneous velocity can be calculated from the transmission ratio. A unique feature of the current set-up is realized by retro-reflecting the incident laser so that the velocity component measured is in the streamwise direction. Streamwise velocities and turbulence intensities were measured upstream and downstream of the jet injection locations. The measurements show the velocity and turbulence in characteristic regions of the flow including the separation shock, bow shock, and the mixing layer of the jet as it develops into two counter rotating vortices. The elliptical jet showed a more rapid spanwise spreading of the shear layer and greater turbulence intensity, although it had a reduced lateral penetration compared to the circular jet.
| Original language | English (US) |
|---|---|
| State | Published - 1997 |
| Externally published | Yes |
| Event | 33rd Joint Propulsion Conference and Exhibit, 1997 - Seattle, United States Duration: Jul 6 1997 → Jul 9 1997 |
Other
| Other | 33rd Joint Propulsion Conference and Exhibit, 1997 |
|---|---|
| Country/Territory | United States |
| City | Seattle |
| Period | 7/6/97 → 7/9/97 |
ASJC Scopus subject areas
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering
- Mechanical Engineering
- Control and Systems Engineering
- Aerospace Engineering