D-334 空気中を伝播するレーザー支持デトネーション波の 2 次元数値解析

概要

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In a pulse laser propulsion, laser energy absorbed in LSD process is efficiently converted to thrust work. In LSC process, the efficiency of the energy conversion will be degraded. Thereby, the LSD-LSC thresholds of laser power intensity are important parameter to predict the performance of a pulse laser powered vehicle. In a standard atmospheric air, a LSD wave transits to a LSC wave at approximately 1MW/cm^2. However, the LSD-LSC threshold of laser power intensity is unknown in reduced atmospheric densities. In this work, the LSD-LSC thresholds in reduced atmospheric densities are investigated by solving the propagation processes of LSD and LSC waves by a solution adaptive unstructured 2-D CFD code with laser-plasma interaction models. Before CFD analysis the plain LSD wave propagation in air was analytically calculated. Consequently, the efficiency converted from laser energy to blast wave energy is about 27% at a standard atmosphere, and the efficiency decreases with the atmospheric density.
日本流体力学会の論文
2003-07-28