地下洞库群风仓式施工通风仿真模拟计算研究

The Simulation Computing Research on Air Cabin Construction Ventilation in Underground Storage Caverns

本文依托某大型复杂地下储气洞库群修建中采用竖井+风仓+风管的通风模式,为满足工程施工通风的需要,研究不同风仓尺寸和风机布置形式对轴流风机效率的影响,建立了17组风仓GAMBIT有限元数值模型,通过FLUENT软件进行模拟计算,得到了轴流风机效率最大时的风仓尺寸和风机布设形式。计算结果表明,在风仓高度固定为9 m的条件下,风仓长度取30 m、宽度取10 m时,风仓内旋流数目最少,风仓两侧的风机效率最高,因此,可确定风仓的最佳尺寸;另外,在此基础上风仓中间不设置隔板,风仓每侧风机分列布置且风机间横向和竖向间距都为2 m且风机间不设置隔板,可得到最佳轴流风机效率。

This article relied on the ventilation mode as shaft ＋ air cabin ＋ duct used in large complex constructing underground gas storage caverns. In order to meet the needs of the construction ventilation and study the impact of different air cabin sizes and fans arrangements to axial fan efficiency, 17 air cabin GAMBIT finite element numerical models were established and the size of air cabin and the arrangement of fans with the best efficiency were get via FLUENT software. In addition, the simulation results reflected that the air cabin under conditions of fixed height of 9 m with taking the length of 30 m and width of 10 m, the number of air swirling within the air cabin was the least, and the efficiencies of fans on both sides of the cabin were the highest. In order to get the best reasonable efficiency of axial fan, it is proposed that partitions were not set in the middle of the air cabin and space among adjacent fans on the basis of the fixed size of the air cabin and fans were arranged for 2 lines with the horizontal and vertical distance 2 m was the best. The results of analysis provided a reference for vertical shaft ventilation of other underground cavity groups.