MECHANICAL VIBRATION; A DRIVING MECHANISM FOR COMBUSTION INSTABILITY IN ROCKET ENGINES.
DUBLIN UNIV (EIRE) SCHOOL OF ENGINEERING
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The mixing and burning of gasair jets in the presence of mechanical vibration of the injector was studied. Initial photographic Schlierer and spectroscopic observations of a H2air and coal gasair 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
- Combustion and Ignition
- Rocket Engines