The Spectrum of Laser-Induced Turbulence
ARMY ELECTRONICS COMMAND FORT MONMOUTH NJ
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The structure of turbulence as induced by the propagation of a high energy laser beam in a fluid is investigated. An analytical theory is developed predicting the spectral laws of temperature fluctuations. The theory involves a hierarchy of equations, which is closed by the method of cascade, as has been developed and applied by Tchen to hydrodynamic and plasma turbulences. The inertia and dissipation subranges are found to follow a modified Kolmogorov law and a modified -133 power law, respectively. The critical wavenumber separating the two subranges has been determined to occur at a lower wavenumber than that in the velocity spectrum. In addition, the magnitude of the inertia spectrum is increased by the laser beam as a result of the enhanced conduction. The parameters and the numerical coefficients entering into the spectrum are also determined analytically.
- Atmospheric Physics