采用CFD软件Fluent对贮库内偏二甲肼泄漏后液池蒸发扩散质量分数变化过程进行数值模拟,分析研究了特定通风条件下贮库内气体运动规律和偏二甲肼连续扩散后的质量分数时空分布规律.结果表明,机械排风、负压进风条件下,贮库内气体呈现一定的循环流动;高质量分数区域主要集中在进风口下方;在z轴方向截面上偏二甲肼气体呈环形分布.

This paper studies the diffusing characteristics and the concentration distribution of unsymmetrical dimethylhydrazine (UDMH) released on the ground and formed into a pool under the storage condition due to some causes. The change process of concentration of UDMH evaporated from the pool on the ground is numerically simulated with Fluent software by the Computational Fluid Dynamic (CFD) method. The movement of the storeroom-air and the space-time distribution characteristics of the concentration of UDMH evaporated continually under some specified aeration conditions are studied. It is shown that the effect of gravity on the dispersion is significant; under the condition of air exhaust by devices and air intake by subatmospheric pressure, the storeroom-air moves in cycles; high concentration areas are mainly under the air intake where the speed of air is low; in the cutter tip of z axis, UDMH is distributed in circles. These results can provide some food of thought for accident disposal.