THE TREATMENT OF AIRBLAST RADIUS-TIME AND PRESSURE-DISTANCE DATA BY THE USE OF POLYNOMIAL APPROXIMATIONS, WITH APPLICATION TO PENTOLITE DATA,
Abstract
Two of the more important airblast characteristics are the pressure-distance relation and the time-of-arrival (radius-time) relation. In principle it is possible to relate them via the Rankine-Hugoniot relations. But experimental data often contain a great deal of scatter. In order to obtain the one relation from the other, a smoothing function is applied to the data, and this function is then either differentiated or integrated to give the pressure-distance or radius-time curve. If both sets of exp jimental data are available, a cross check on smoothing functions and reduction of scatter can be obtained by trying to go from the one curve to the other and back again. This report describes the use of polynomials in the logarithm of the variables in this task, and the application to the standard pentolite data. The variable gamma correction for real gases is applied at close-in distances. Pressure-distance data calculated from radius-times agreed to within a few percent with results reported elsewhere over a range of 1 to 1000 psi. Reversing the process gave arrival times which agreed to 4 significant figures with these results. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 15, 1962
- Accession Number
- AD0422198
Entities
People
- D. L. Lehto
- L. J. Belliveau
Organizations
- Naval Ordnance Laboratory