Gasdynamic Particle Accelerators - An Optimization,
Abstract
The problem of determining the streamwise variation of gas stream velocity in a nozzle such that the acceleration of particles within the gas stream is everywhere a maximum has been reduced to a quadrature when the following parameters are constants: ratio of specific heats and stagnation conditions of the gas, mass, size, and drag coefficient of the particles. The quadratures have been evaluated for three values of the ratio of specific heats: 5/4, 7/5, and 5/3. The results indicate that a high-enthalpy, high-pressure plasma arc with an optimized nozzle appears to offer the possibility of significantly improved simulation of high heating rates simultaneously with high particle velocities and longer testing times required for advanced hypersonic vehicles. For example, assuming a particle drag coefficient of 1.0, a plasma arc with a stagnation enthalpy of 6,000 Btu/lbm and a stagnation pressure of 190 atmospheres may achieve particle velocities of 11,800 and 7,000 feet per second for particle diameters of 50 and 1,500 microns, respectively, with a 17.25 foot long optimized nozzle. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1973
- Accession Number
- ADA092069
Entities
People
- E. Migotsky