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- 2018
复杂长竖井引水隧洞施工通风两相流模拟研究
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Abstract:
复杂长竖井引水隧洞纵横交错的洞室布置和上下平洞间的大高差导致其通风散烟困难, 然而施工通风效果的好坏直接影响工程施工进度和施工安全．现有引水隧洞施工通风两相流数值模拟研究多是针对单一隧洞或同平面的交叉隧洞, 并且其网格独立性分析局限于通过单一经验公式验证．本研究首先提出综合考虑气固两相相互作用力和上下平洞大高差导致的压差作用影响的复杂长竖井引水隧洞施工通风三维非稳态欧拉两相流数学模型, 并且通过与现场实验数据对比, 验证了数学模型的可靠性; 其次, 采用偏斜度指标、速度变化百分比以及经验公式对网格独立性进行分析, 得出合理的网格划分方案; 最后, 结合实际工程, 模拟得出复杂长竖井引水隧洞施工通风过程中的风流结构分布和污染物(粉尘、CO)迁移变化规律, 并基于模拟结果得出合理的通风散烟时间．
The crisscrossed cavity layout and large height difference between upper and lower horizontal sections in complex diversion tunnels with long vertical shafts result in difficulties in ventilation，and ventilation directly affects the construction schedule and safety. The current construction ventilation two-phase flow researches of diversion tunnel mainly focus on a single tunnel or conplane intersection tunnels，and the grid independence analysis is limited to single experience formula verification. Firstly，by considering gas-solid interaction force and pressure difference caused by large height difference between upper and lower horizontal sections synthetically，a three-dimensional unsteady Euler-Euler two-phase flow model was established，and the reliability of the mathematical model was verified by comparing it with in-situ test data. Then the equisize skew index，velocity percentage change and an experiential formula were used to analyze grid independence to obtain a reasonable meshing scheme. Finally，combined with practical engineering，the distribution of airflow structure and migration law of contaminants were obtained，and the rational ventilation time was proposed according to the simulation result
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