INVESTIGATION OF AIR-AUGMENTED ROCKET COMBUSTION AND MIXING PROCESSES.
Technical progress rept. no. 3, 15 Sep 67-29 Feb 68,
ATLANTIC RESEARCH CORP ALEXANDRIA VA
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Data on coaxial jet mixing and combustion developed during a ten-week test program are presented along with a limited analysis of results. The test was conducted with a rocket motor simulator which generated a fuel-rich primary stream. The combustion of the primary stream was varied systematically through a broad range of conditions, and the exchange processes were observed in a secondary mixing duct by means of wall pressure measurements, thrust measurements, and measurements of heat flux. Photographic observations were made of the primary stream operating as a free jet. Preliminary analysis indicates that the length of duct required for momentum and energy exchange to occur depends primarily upon the secondary air mass flow. A brief discussion is included on the grouping of variables in afterburning problems, and a simplified throttling number parameter is suggested. Also included are the results of a mixing zone computation in which the differential equations of coaxial mixing are solved by a finite difference procedure. Results are presented of calculations made to predict wall pressure profiles that are influenced by the presence of the bluff face of the primary stream blast tube. This analysis covers the flow regime that extends to the length of the primary stream potential core. Author
- Combustion and Ignition
- Rocket Engines