INTENTIONAL COMBUSTION OSCILLATIONS IN PROPULSION SYSTEMS.
Abstract
The power density available from a magnetohydrodynamic (MHD) generator is a function of the plasma velocity and electrical conductivity (which shows an exponential dependence on temperature). An increase in velocity by expansion of the gas through a nozzle can reduce the temperature and consequently the power density. Modulation of these two parameters may be achieved by using combustion oscillations within a MHD generator. The periodic variations in velocity and temperature (hence conductivity) give a higher mean power density. Simple formulae are given by which the increase in power density is demonstrated for combustion oscillations having pressure amplitudes up to unity. Different types of generator are possible in which combustion os oscillations provide the required modulation and these are discussed. In order to verify the theory an experimental was designed and constructed to provide the first order travelling tangential mode of combustion oscillation. The instrumentation was developed to cope with the extreme conditions arising in the combustion chamber. Results so far indicate the oscillatory nature of the conductivity. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 25, 1966
- Accession Number
- AD0635741
Entities
People
- J. Swithenbank
Organizations
- University of Sheffield