THEORETICAL CONSIDERATIONS RELATING TO THE EFFECT OF INJECTOR DESIGN ON UNSTABLE BURNING OF LIQUID PROPELLANT ROCKET MOTORS.
Abstract
Rocket motors burn unstably when the rate of conversion of liquid propellants to product gases is influenced by disturbances in the internal gas dynamic field in such a way as to amplify the disturbances more than they are attenuated by the various damping mechanisms. Thus, it has long been recognized that coupling between the conversion process and the internal field is of vital importance to motor stability. Of the several mechanisms which are found to influence this coupling significantly, the influence of the injector configuration has been least studied theoretically. The present study is concerned with the influence of one specific family of injectors, namely the socalled like-on-unlike impinging doublet. It is clear that fluctuations in the gas dynamic field may cause the point of impingement to fluctuate, and thereby produce fluctuations in the rate of feed of liquid into the conversion region. That these fluctuations may have a very significant effect on motor stability is suggested by numerical calculations based on a crude analytical model. A number of the features of 'injector zone coupling' are then discussed physically, and shown to be to a large extent independent of the crudity of the analytical model. Certain of these considerations should have application to practical motor design. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1965
- Accession Number
- AD0462337
Entities
People
- F. T. Mcclure
- R. H. Cantrell
- R. W. Hart
Organizations
- Johns Hopkins University