Structure Limits for a 30mm Annular Piston

摘要

General Electric Ordnance Systems Div has designed and fabricated at 30-mm regenerative liquid propellant gun (RLPG) system. The fixture was installed at the BRL in July, 1984. The fixture is now being used to evaluate liquid propellants and study various features of the RLPG cycle. The annular injection piston of the RLPG was subjected to a stress analysis to determine if the existing design could be used in high performance firings. The piston was shown to fail under 558 MPa chamber pressure using finite-element stress analysis. This study concluded that the piston must be redesigned to reduce the unbalanced forces which exist across the thin shell portion of the piston wall before high performance firings with this fixture could be attempted.