The Development of the Wall Momentum Erosive Burning Scaling Law and Macro Scale Erosive Burning Model
Abstract
The traditional approach to erosive burning modeling in solid propellants is to correlate test data to bulk flow quantities such as Mach Number or velocity. Within certain flow regimes and for a fixed geometry the test data appears to correlate well with these variables, showing that the erosive burning magnitude is highly dependent upon the cross-flow velocity. However, erosive burning is well known to demonstrate a dependency upon the base burning rate of the propellant, as well as exhibiting a threshold cross-flow velocity condition, below which no apparent increase in burning rate is seen. Presented in this report are numerical results that demonstrate the erosive burning threshold condition and a correlation of the data to a quantity termed the wall momentum ratio. This ratio is based on the local wall shear stress and the local mass injection rate. The numerical results and the correlation are compared to test data obtained through ultrasound measurements of the propellant surface regression rate. The comparison shows excellent agreement with test data in both the burn rate augmentation factors and the threshold condition. The wall momentum function is used to develop a macro scale erosive burning model suitable for use in interior ballistics analyses as a predictive tool.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 2010
- Accession Number
- ADA521297
Entities
People
- Brian A. Mcdonald
Organizations
- Aviation and Missile Research, Development, and Engineering Center