Physics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jpnt.confrq...w&link_type=abstract
AIAA, SAE, ASME, and ASEE, Joint Propulsion Conference and Exhibit, 28th, Nashville, TN, July 6-8, 1992. 9 p.
Physics
Engine Failure, Engine Tests, Solid Propellant Rocket Engines, Static Tests, Titan Launch Vehicles, Failure Analysis, General Overviews, Pressure Distribution, Propellant Grains
Scientific paper
A test firing of the PQM-1 motor for the Titan IV SRMU is discussed emphasizing its failure event and implications for redesign. The motor was fired vertically at a test stand, and 470 gages were used to record data on the test stand and the motor. Ignition occurred as predicted, but the forward pressures exceeded predicted values and increased until rupture of the motor case occurred at 1.6 sec. The failure is examined and found to relate to an excessive pressure drop and grain deformation at the aft radial slot. Grain-stability failure caused an underpredicted pressure drop leading to excessive constriction of the aft centerport. Based on the results the PQM-1 motor is redesigned by chamfering the forward bore regions of the aft and center segments and by reducing the propellant load by about 2680 lbs. The redesign is expected to improve grain deformation conditions and pressure distribution in the motor.
Anderson Jeffrey M.
Meyden M. V.
Wilson Graham W.
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