煤与瓦斯突出气固两相流的相间能质传递特征及非稳态输运机制

煤与瓦斯突出的气固两相流输运特征对于保证突出的持续发展具有重要意义，同时也是造成风流逆转、瓦斯及煤尘爆炸等次生灾害的主要原因，然而目前对该问题的研究相对较少且缺乏实验支撑。针对上述现状，本项目以突出发展过程中的两相流非稳态输运机制为研究对象，采用输运流型转换边界判定、层析成像分析等创新性研究方法，分析突出两相流相间能量-质量传递特征及其粒径效应，确立多因素影响下的两相流输运控制方程；获得不同粒径煤初始瓦斯放散特征的等效动力学模型，揭示瓦斯快速放散对两相流输运的控制机制。在此基础上，探索非均质突出煤的双粒度等效表征方法，构建基于煤粉/煤颗粒双粒度分布的突出两相流非稳态输运模型，并应用于突出两相流的流场解算，获得突出两相流在巷道内输运过程的时空演化特征。研究工作将有助于掌握突出两相流在巷道内的非稳态输运机制及特征参数，丰富突出机理，对突出灾害的预防和井下紧急避险方案的制定具有重要的科学意义。

The pneumatic transport characteristic of outburst coal-gas two-phase flow has significant meaning for the continuous development of outburst disaster, which is also the main cause for the secondary disasters such as airflow reversal, gas explosion and coal dust explosion. But corresponding studies concerning this problem is few and short of the support from experiments. In this project, to gain the understanding of unsteady transport mechanism of coal-gas two-phase flow during the development stage of outburst, research methods such as flow pattern conversion boundary determination and tomographic analysis are applied to study the particle-size effect of inter-phase interaction of gas-solid in outburst two-phase flow; construct the governing equations of two-phase flow transport under the influence of multi-factors; obtain the equivalent kinetic model for the gas diffusion property of coal with different particle size; and reveal the control effect of rapid gas diffusion on outburst two-phase flow transport. On this basis, the bimodal particle size equivalent characterization method for heterogeneous outburst coal is explored; the unsteady transport mechanism of outburst two-phase flow with the assumption based on bimodal particle size distribution of coal powder/particle is established to calculate the flow field of outburst coal-gas flow, so that the spatiotemporal evolution characteristics of outburst two-phase flow during its motion process through the underground roadway can be obtained. The research results of this project will help to grasp the unsteady transport mechanism and characteristic parameters of outburst coal-gas flow in underground roadway as well as enrich the outburst mechanism, which will be of great scientific significance for the outburst disaster prevention and the establishment of underground emergency plan.