Research on Unsteady Combustion Processes.
Abstract
Dynamic responses of rocket motors and aluminum combustion under rocket motor conditions were investigated and the results related to combustion stability and motor efficiency. The first part of the study is centered around the Forced Longitudinal Wave Motor, which was developed to investigate the dynamic responses of high performance rocket motors in which externally excited longitudinal pressure and velocity waves produce couplings with propellant combustion processes. A linear analysis revealed that the imaginary part of the velocity coupling response can be deduced from the phase angle between the nozzle- and head-end responses and that a precise knowledge of the pressure coupling response is not required. Acoustic velocity measurements were achieved using a magnetic flowmeter. Velocity and pressure coupled response data were obtained for AP/HTPB propellants. In the second part of the study, the combustion and agglomeration processes of aluminum particles burning under rocket motor conditions were investigated. Burning aluminum agglomerates were photographed as they passed through a subsonic nozzle. The velocity differential between the agglomerates and the gas deformed the agglomerates causing them to break up. A break-up criterion based on the ratio of shear to surface tension forces was developed. Agglomeration processes were characterized and modelled. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1981
- Accession Number
- ADA110541
Entities
People
- D. B. Bliss
Organizations
- Princeton University