Expansion Into Vacuum of Gas Bound by Shell and Porous Medium
Abstract
The expansion into a vacuum of a gas, bound by a shell-like mass with zero tension, has been evaluated. Planar, cylindrical and spherical expansions are considered. The flow is self-similar. The effect of the shell is to reduce expansion velocities, increase gas static pressure, reduce gas dynamic pressure and increase the net impulse at a station. The present study represents a generalization of the Sedov similarity solution for an unbound gas expansion into a vacuum. An approximate local similarity solution is given for the case where the shell is bound by highly compressible porous medium. After long times, the net momentum of the effective shell continues to increase with increase in radius. The latter result differs from the Zeldovich and Raizer treatment of a point explosion in a porous medium due to inclusion in the present study of the effect of gas pressure on late time shell motion.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 15, 1990
- Accession Number
- ADA220204
Entities
People
- H. Mirels
Organizations
- The Aerospace Corporation