Abstract
Cold Gas Dynamic Spray (CGDS) of metal powders has been used to produce coatings on aluminum and steel substrates. This is a new process in which the metal powder is accelerated by injection into the subsonic end of a supersonic nozzle (design Mach number 3.2) and coatings form by the dissipation of kinetic energy of the powder on the substrate. In order to understand the effect of flow physics on the properties of the coating produced, flow visualization of supersonic rectangular jet impingement is performed using schlieren photography, and single and double pulse laser sheet illumination of the jet. Roller type structures (vortices) with distinct core and braid regions were observed in the shear layer of jet, a standoff shock was observed near the stagnation point. The flapping mode in the jet increased as the distance between the nozzle exit and substrate increased and this is postulated to be the reason for use of short standoff distance in the CGDS spraying community.
| Original language | English (US) |
|---|---|
| State | Published - 1999 |
| Externally published | Yes |
| Event | 37th Aerospace Sciences Meeting and Exhibit, 1999 - Reno, United States Duration: Jan 11 1999 → Jan 14 1999 |
Other
| Other | 37th Aerospace Sciences Meeting and Exhibit, 1999 |
|---|---|
| Country/Territory | United States |
| City | Reno |
| Period | 1/11/99 → 1/14/99 |
ASJC Scopus subject areas
- Space and Planetary Science
- Aerospace Engineering