Accession Number : ADP006012

Title :   Advances in Solid Rocket Nozzle Design and Analysis Technology in the United States Since 1970,

Corporate Author : AIR FORCE ROCKET PROPULSION LAB EDWARDS AFB CA

Personal Author(s) : Hildreth, Joseph H.

Report Date : APR 1988

Pagination or Media Count : 15

Abstract : The design approaches for solid rocket nozzles and the analytical methods used to develop these designs have changed substantially during the past decade. Although nozzle designs have tended to become somewhat more simplified, the demands that the design requirements place on the new nozzle designs force the use of greater analytical complexity. Nozzle designs have progressed toward minimizing the number of parts and reducing the surface erosion as much as possible. The most significant changes have been the incorporation of 3 directional carbon-carbon throats for space and air launch nozzle types, and use of the 2D carbon-carbon involute exit cone in space nozzle designs. The continuing trend for the design of nozzles is to incorporate higher performance materials by part replacement without substantially altering the configuration. The most significant improvement in the analytical techniques is the capacity to effectively model the behavior of the involute exit cone. The current trend in nozzle analysis is to make wider use of nonlinear and 3 dimensional analytical techniques. The work which most needs to be done to improve the nozzle design capabilities is in the area of material technology. We must understand the influences of changes in the raw materials and manufacturing processes on the ultimate performance of the nozzle part.

Descriptors :   *ROCKET NOZZLES, SOLID PROPELLANT ROCKET ENGINES, STRUCTURAL ANALYSIS, THERMAL ANALYSIS, TUNGSTEN, GRAPHITE, CARBON CARBON COMPOSITES, NOZZLE THROATS, EXITS, CONICAL NOZZLES, NONLINEAR ANALYSIS, THREE DIMENSIONAL, METHODOLOGY, SYSTEMS ANALYSIS.

Subject Categories : Solid Propellant Rocket Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE