NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Thermal Analysis of a Carbon Fiber Rope Barrier for Use in the Reusable Solid Rocket Motor Nozzle Joint-2This study provides for development and verification of analysis methods used to assess performance of a carbon fiber rope (CFR) thermal barrier system that is currently being qualified for use in Reusable Solid Rocket Motor (RSRM) nozzle joint-2. Modeled geometry for flow calculations considers the joint to be vented with the porous CFR barriers placed in the "open' assembly gap. Model development is based on a 1-D volume filling approach where flow resistances (assembly gap and CFRs) are defined by serially connected internal flow and the porous media "Darcy" relationships. Combustion gas flow rates are computed using the volume filling code by assuming a lumped distribution total joint fill volume on a per linear circumferential inch basis. Gas compressibility, friction and heat transfer are included in the modeling. Gas-to-wall heat transfer is simulated by concurrent solution of the compressible flow equations and a large thermal 2-D finite element (FE) conduction grid. The derived numerical technique loosely couples the FE conduction matrix with the compressible gas flow equations, Free constants that appear in the governing equations are calibrated by parametric model comparison to hot fire subscale test results. The calibrated model is then used to make full-scale motor predictions using RSRM aft dome environments. Model results indicate that CFR thermal barrier systems will provide a thermally benign and controlled pressurization environment for the RSRM nozzle joint-2 primary seal activation.
Document ID
20010048758
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Clayton, J. Louie
(NASA Marshall Space Flight Center Huntsville, AL United States)
Phelps, Lisa
Date Acquired
August 20, 2013
Publication Date
January 1, 2001
Subject Category
Spacecraft Propulsion And Power
Meeting Information
Meeting: JANNAF Interagency Propulsion Committee Meeting
Location: Cocoa Beach, FL
Country: United States
Start Date: March 27, 2001
End Date: March 29, 2001
Sponsors: Department of the Air Force, Department of the Army, NASA Headquarters, Department of the Navy
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

There are no available downloads for this record.
No Preview Available