Accession Number:

ADA179208

Title:

Transient Reactive Exhaust Flow from a Ring-Symmetric HF/DF Space Laser.

Descriptive Note:

Final rept. Jan-Mar 87,

Corporate Author:

FALCOVITZ (JOSEPH) HAIFA (ISRAEL)

Personal Author(s):

Report Date:

1987-03-01

Pagination or Media Count:

53.0

Abstract:

Transient diffuser flow in an HFDF laser is analyzed via a simplified model. A radial laser configuration is assumed where the diffuser is idealized as a ring-symmetric channel of uniform width. The outward radial flow following an abrupt start-up of diffuser inflow is computed numerically using a GRP-type code for integrating the Euler equations, which include an ongoing reaction of hydrogen recombination. A new kinetic scattering effect is suggested, resulting from the recoil of an HF or DF molecule assisting as third body in the hydrogen recombination reaction. The main conclusion is that transient diffuser plume flow effects do not drastically aggravate the potential for contaminating backflow HF DF caused by either thermal or kinetic backscattering. Keywords Laser exhaust Spacecraft contamination Chemical laser Exhaust plume, Hydrogen recombination Transient flow.

Subject Categories:

  • Lasers and Masers
  • Unmanned Spacecraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE