Hydrodynamic effects of laser beams slewed at transonic velocities through the atmosphere
Technical Report
·
OSTI ID:5448466
The hydrodynamic effect of a laser beam slewed through the atmosphere is treated by various approximations which are singular or invalid near Mach 1. A modified linear solution which is valid for transonic slewing velocities is presented for the one-dimensional case. This solution predicts the density, pressure, and material velocity changes at fully developed flow, in good agreement with numerical nonlinear hydrodynamics calculations. The form of the fully developed flow solution changes discontinuously as the absolute slewing velocity increases, from a shock wave upwind of a locally subsonic source, to an expansion wave downwind of a locally supersonic source. The maximum density and other changes occur in the shock wave solution, at the transition velocity, and are proportional to the square root of the total source strength. The transient behavior leading to the fully developed flow solution is qualitatively described. The steady state form of the modified linear solution is shown to be an approximation to a nonlinear steady state solution, provided the local Mach number used in the latter solution is properly interpreted in terms of the absolute slewing velocity and the initial sound speed in the undisturbed medium. The properties of the one-dimensional case have important implications for the two-dimensional case. The solution of the two-dimensional case is necessary for the calculation of the effects of thermal blooming on the propagation of high powered laser beams through the atmosphere.
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5448466
- Report Number(s):
- UCID-17602
- Country of Publication:
- United States
- Language:
- English
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