Investigation of Combustion Overpressure During Ignition of the Apollo Block II SPS Engine (AJ10-137) (Phase 4, Part 2)
Abstract
An investigation was conducted to determine the magnitude and duration of combustion overpressure during ignition of the Apollo SPS Block II engine. Fifty-four engine starts were made at a pressure altitude of 115,000 ft for a total of 62 sec of firing time. Engine hardware and propellant temperatures were varied from 30 to 70F but did not influence combustion overpressure. The magnitude of combustion overpressure was affected by propellant injector fill characteristics which were a function of bipropellant valve opening time and target chamber pressure. The overpressure ranged from 0 to 48 percent above the steady-state chamber pressure level for durations ranging from 15 to 39 msec. The overpressure duration was not influenced by the various starting conditions.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1969
- Accession Number
- AD0846904
Entities
People
- R. C. Ansley
- R. L. Barebo
Organizations
- Arnold Engineering Development Complex