Accession Number:

AD0628920

Title:

MECHANICAL VIBRATION; A DRIVING MECHANISM FOR COMBUSTION INSTABILITY IN ROCKET ENGINES.

Descriptive Note:

Technical rept.,

Corporate Author:

DUBLIN UNIV (EIRE) SCHOOL OF ENGINEERING

Report Date:

1965-11-01

Pagination or Media Count:

32.0

Abstract:

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

Subject Categories:

  • Combustion and Ignition
  • Rocket Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE