A Coupled Interior Ballistics Finite Element Combustion Instability Analysis Procedure. Part II.
Abstract
A computer code is formulated which provides the solid propellant grain designer with the capability of performing an interior ballistics analysis while, with a minimum amount of additional effort, at the same time performing a combustion instability prediction analysis at any designated point in time during the entire period of performance. The program, in effect, couples the output of an existing solid propellant grain design evaluation code, which predicts the acoustic chamber geometry during surface regression, with the input to the existing three-dimensional finite element combustion instability prediction code, FLAP3. The three-dimensional finite element mesh and boundary conditions are generated from the grain surface regression data for the progressive burn times. The entire finite element mesh and boundary condition generation by FLESH3, the companion to FLAP3, is executed with the input of seven geometry parameters, which are obtained from the ballistics code output, and the corresponding burn depth parameter. The use of the developed program is demonstrated for three different values of burn depth for the case of a typical star design. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 26, 1979
- Accession Number
- ADA075110
Entities
People
- Robert M. Hackett
Organizations
- United States Army Aviation and Missile Command