Unsteady laminar laser heated boundary layers at a three-dimensional stagnation point
Abstract
Laser-heated unsteady laminar compressible boundary layer flow with variable mass transfer at a three-dimensional stagnation point is investigated as a model of heat transfer in laser propulsion. The semisimilar partial differential equations governing the laser-heated flow of pure hydrogen at the forward stagnation point of a three dimensional body with arbitrary variations of the free-stream velocity and surface mass transfer in time are obtained and solved numerically using an implicit finite difference scheme. Results indicate that the heat transfer and skin friction are significantly affected by the variation of the density-viscosity product across the boundary layer, as well as by mass transfer, the free stream velocity distribution, wall temperature and the nature of the stagnation point. The behavior of the hydrogen flow is found to differ significantly from that of air, and to be in agreement with previous analyses.
- Publication:
-
Revue Roumaine des Sciences Techniques Serie de Mecanique Appliquee
- Pub Date:
- June 1980
- Bibcode:
- 1980RvRST..25..359N
- Keywords:
-
- Heat Transfer;
- Laminar Boundary Layer;
- Laser Heating;
- Stagnation Point;
- Unsteady Flow;
- Compressible Flow;
- Flow Equations;
- Hydrogen;
- Mass Transfer;
- Partial Differential Equations;
- Skin Friction;
- Velocity Distribution;
- Wall Temperature;
- Lasers and Masers