Accession Number:

ADA008513

Title:

Density Perturbations in Transonic Sluing Laser Beams.

Descriptive Note:

Interim rept.,

Corporate Author:

AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s):

• Ellinwood,John W.
• Mirels,Harold

Report Date:

1975-03-05

Pagination or Media Count:

24.0

Abstract:

A linearized theory is presented for density perturbations in a two-dimensional laser beam as a function of cross-flow Mach number and time after beam turn-on. All times and Mach numbers are considered. A closed-form solution is presented for uniform heating in a circular beam with M 1. The results are compared with the corresponding one-dimensional solution. The time scale to reach steady state and the order of magnitude of the steady-state density perturbation when M approximately 1 are deduced by consideration of nonlinear effects. A qualitative discussion is then given of the variation of the density perturbation along a sluing beam.

Descriptors:

• *LASER BEAMS
• *THERMAL BLOOMING
• NUMERICAL ANALYSIS
• ATMOSPHERIC MOTION
• PERTURBATIONS
• HEAT
• EQUATIONS OF STATE
• TRANSONIC FLOW

Subject Categories:

• Lasers and Masers
• Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE