Slowing down and acceleration of gas combustion fronts while two-spark initiation
V.S. Teslenko, A.P. Drozhzhin, Yu.V. Anisichkin
Lavrentyev Institute of Hydrodynamics SB RAS, Novosibirsk, Russia
Keywords: rivulet flow, inclined plate, nonlinear three-dimensional waves, laser-induced fluorescence technique, theoretical modeling
Abstract
The object of this study is a straight rivulet flowing over an inclined plate whose surface is covered with regular nonlinear waves. Such waves can be modeled in full three-dimensional statement, but it is also possible to use a simplified quasi-two-dimensional approach with self-similar shape of rivulet cross-section. In this study we directly compare the results of two- and three-dimensional approaches, where the shape of the wave rivulet surface is reconstructed experimentally using the laser-induced fluorescence technique. It is shown that the three-dimensional model reproduces well the wave surface of a rivulet, including such three-dimensional peculiarities as the wave front curvature and minor perturbations of its rear slope. Though the two-dimensional model is unable to reproduce such peculiarities, it describes well the parameters and shape of a wave in the central longitudinal cross-section of the rivulet.
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