A Study on the Effects of Variable Surface Area to Volume Ratio on Closed Bomb Burn Rates
Abstract
In response to various discussions on the effects of heat loss on propellant burn rates, an experimental matrix was set up to systematically examine the effects of surface area to volume ratio and loading density on derived burn rates. The propellant used in this study was single perforated M-10 with a web of .058 cm. The surface area to volume ratios (s/v) used were 1,2,3, and 5/cm. The loading densities varied from 0.1 to 0.4 g/cc. The resultant pressure-time data showed a reduction in maximum pressure (P sub max) at constant loading density as the s/v increased. This data was reduced via CBRED2, our closed bomb burning rate reduction program. Burning rate reproducibility was excellent from run to run. There was very good agreement in the derived burn rates for the 0.2, 0.3, and 0.4 g/cc loading densities. Using the constant heat loss option, the variations in s/v had little or no effect on derived burning rates from 30% to 90% of P sub max. At less than 30% P sub max, there seemed to be no consistent effect on the burn rates from varying the s/b. When data was reduced using the proportional heat loss option, burning rates, as well as their slopes, tended to increase as the s/v increased. Considering the extreme variations in the surface area available for heat loss in the experiments, burning rates do not appear to be very sensitive to large s/v changes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1985
- Accession Number
- ADA161826
Entities
People
- Arpad A. Juhasz
- Robert E. Tompkins
- Roger E. Bowman
Organizations
- Ballistic Research Laboratory