Accession Number:

ADA048447

Title:

Boundary Layer Effects in Chemical Laser Nozzle Inlet.

Descriptive Note:

Interim rept.,

Corporate Author:

AEROSPACE CORP EL SEGUNDO CALIF IVAN A GETTING LABS

Personal Author(s):

Report Date:

1977-11-08

Pagination or Media Count:

31.0

Abstract:

Fluorine atom recombination and heat loss to the wall are investigated in the inlet and supersonic expansion region of typical CW chemical laser nozzles. It is concluded that the major losses occur in the inlet section. Expressions given for estimating these losses are based on zero pressure gradient flows with unit Prandtl and Schmidt numbers. For typical geometries, a plenum temperature T sub o 1500 K, and plenum pressures in the range 1 or p sub o, atm or 10, the reduction of total enthalpy at the downstream end of the inlet section varied from about 10 to 30. The reduction within the actual boundary layer mass flow is approximately 40 for a boundary layer thickness defined such that Uu sub e 0.9, where u and u sub e denote local and free-stream velocities, respectively. It is concluded that these losses should be considered when CW chemical laser performance is being estimated or analyzed. Author

Subject Categories:

  • Lasers and Masers
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE