MECHANICAL VIBRATION; A DRIVING MECHANISM FOR COMBUSTION INSTABILITY IN ROCKET ENGINES.
Abstract
The mixing and burning of gas/air jets in the presence of mechanical vibration of the injector was studied. Initial photographic Schlierer and spectroscopic observations of a H2/air and coal gas/air flame vibration conditions have been carried out. The vibration obviously enhances the rate of mixing and higher mean flame temperatures result. A closed solution was obtained for the case of a vibrated gas jet mixing with its surroundings, in the near-field (potential core) region. Generally speaking, the theory predicted that the vibration, treated as a source of vorticity, would raise the mean axial component of velocity at any point inside the mixing region. This was verified by a hot-wire anemometer investigation. Furthermore, it was established that the vibration drives the vortex shedding mechanism in the flow from an orifice. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1965
- Accession Number
- AD0628920
Entities
People
- David Cochrane
- L. Crane
- P. D. Mccormack
Organizations
- Trinity College Dublin