初期直径分布を有する希薄な水液滴群を含む混合気中を伝播する気相デトネーションに関する数値解析

抄録

Two-dimensional numerical simulations based on Eulerian-Lagrangian method are conducted to model a gaseous detonation laden with the polydisperse water spray in a two-dimensional straight channel. The premixed mixture is a stoichiometric hydrogen oxygen slightly diluted with nitrogen at low pressure. The behavior of the polydisperse water spray behind the leading shock front are analyzed by categorizing water spray based on whether the water droplet experienced the transverse wave or the jet. The jet and transverse waves, which play a dominant role in inducing the breakup and polydispersity, have different effect on polydisperse spray depending on the initial droplet diameter. For the water droplets with smaller initial droplet diameter, the breakup process tends to be completed shortly before the droplets experience the jet, and the transverse waves contribute to breakup more than the jet. In contrast, the time of breakup process is lengthened with larger initial droplets, and the contribution of the jet overcomes that of the transverse waves as the droplets experience the jet before the end of breakup process. Indeed, the jet can induce higher relative velocities, which leads to a more intense breakup relative to that induced by transverse waves.