Boundary Layer Effects in Chemical Laser Nozzle Inlet.
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 U/u 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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 08, 1977
- Accession Number
- ADA048447
Entities
People
- Harold Mirels
- Shaowen W. Liu
Organizations
- The Aerospace Corporation