Throttlable Primary Injector for Staged Combustion Engine

摘要

The objective of this program was to demonstrate a throttlable primary injector for a storable space engine employing the staged combustion cycle. The program goal was to demonstrate throttling over a 10:1 range. Specific accomplishments of the program were as follows: (1) completed the detailed design of a flightweight modular primary injector for the storable space engine using the HIPERTHIN injector concept, (2) demonstrated the injector over 90% of the desired throttling range (9K to 45K thrust), (3) established critical design and fabrication parameters for the HIPERTHIN injector concept, (4) demonstrated the performance of the HIPERTHIN injector through a chamber pressure range from 258 to 4390 psia and mixture ratio range from 10.7 to 27.0, (5) demonstrated durability by conducting 87 tests with one injector in excess of 200 sec, with durations ranging from 10 sec at high thrust to 72 sec at low thrust, and (6) conducted supporting studies to provide additional design data in the areas of fluid flow and low frequency instability.