含尘气体Rayleigh-Taylor不稳定性诱导混合的多相浮阻力模型研究

文章首先采用单相浮阻力模型对不同加速度下Rayleigh-Taylor不稳定性诱发的物质渗透边界的演化过程进行了计算, 揭示了该混合在常加速度和变加速度情况下不同的发展规律, 并通过与实验结果的比较分析, 验证了该模型的适用性.在此基础上, 发展了多相浮阻力模型, 采用该模型对常加速度情况下含尘气体中的Rayleigh-Taylor不稳定性诱导混合进行了研究, 发现混合区宽度随着颗粒数密度和颗粒尺寸的增大而减小, 揭示了气体中所含杂质抑制混合发展的规律. 

Study on Multiphase Buoyancy-Drag Model of Mixing Induced by Rayleigh-Taylor Instability in Dusty Gases

The evolutions of the material interpenetration boundary induced by Rayleigh-Taylor instability were calculated under various acceleration histories using a buoyancy-drag model. It reveals that the development of mixing under constant acceleration is very different from that under variable acceleration. The calculation results were compared with detailed experimental data to prove the validation of the model. On the bases of these, a multiphase buoyancy-drag model was developed to study the mixing induced by Rayleigh-Taylor instability in dusty gases under constant acceleration. It is found that the mixing width decreases with the increase of the dusty concentration and the size of particles, which reveals that the particles in dusty gases restrain the development of mixing.