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首先对气、液态甲烷的危险特性进行了分析,针对危险性最大的重气扩散过程,详细分析了其形成机理及影响因素。随后对国内外重气扩散问题的相关研究进行了全面的梳理和总结,在试验方面,介绍了Burro、Coyote和Falcon系列大型重气扩散经典试验;在理论分析和数值仿真方面,概述了典型重气扩散模型的基本原理及优缺点,针对CFD方法在重气扩散模拟上的应用进行了较为细致的介绍。最后结合液氧/甲烷发动机试验台的具体排放需求,提出了高空排放、燃烧处理及围堰排放三种排放方式,叙述了各自的工作原理、优缺点及其适用范围,并结合重气扩散特点相应地给出优化方案。
First of all, the dangerous characteristics of gas and liquid methane are analyzed. According to the process of heavy gas diffusion with the greatest danger, the formation mechanism and influencing factors are analyzed in detail. Then, the related researches on the diffusion of heavy gas at home and abroad are comprehensively reviewed and summarized. In the aspect of experiments, the classic tests of large-scale heavy gas diffusion by Burro, Coyote and Falcon series are introduced. In the theoretical analysis and numerical simulation, The basic principle, advantages and disadvantages of gas diffusion model are introduced in detail for the application of CFD method in heavy gas diffusion simulation. Combined with the specific emission requirements of the liquid oxygen / methane engine test bench, three emission modes of high altitude emission, combustion treatment and cofferdam emission are put forward. Their working principles, advantages and disadvantages and their applicable scope are described. Combined with the characteristics of heavy gas diffusion The optimal solution is given accordingly.