基于VOF模型的偏二甲肼泄漏液池扩展过程的数值模拟
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摘要
偏二甲肼泄漏后沿存储容器外壁面扩展以及在地面上形成液池的大小、形状和位置是对其进行危害性评估的前提条件。针对偏二甲肼容器可能发生的泄漏位置,采用VOF模型对偏二甲肼泄漏状况进行了数值模拟,得到了不同时刻偏二甲肼沿存储容器外壁面扩展以及在地面上形成液池的分布情况,分析了偏二甲肼泄漏速度对外壁液体及液池扩展的影响。结果表明:偏二甲肼泄漏时在存储容器外壁面上以细长且垂直向下的方式扩展;偏二甲肼以45.8cm3/s的速度泄漏4s,泄漏液在地面上形成面积约为220cm2的半圆形液池;偏二甲肼泄漏速度越大,泄漏过程中产生的液滴越少;当偏二甲肼泄漏速度加倍时,偏二甲肼泄漏后在地面上形成的液池面积增长了近4倍。
A propellant pool takes shape after the Unsymmetrical Dimethylhydrazine(UDMH)leakage and obtaining the size,shape,and position information of the liquid pool is the prerequisite of UDMH leakage hazard assessment.According to the possible leakage location of UDMH container,this paper uses the VOF model to simulate the leakage process,obtains the distribution of UDMH on the container wall and liquid pool on the ground,and analyzes the influence of leakage velocity on the expansion of liquid and the pool.The results show that a slender and vertically downward liquid pool takes shape on the wall of propellant container;after 4 seconds of leakage at the velocity,a 220 cm2 semicircle liquid pool comes into being on the ground;there will be less propellant drop if leakage velocity becomes larger,and the propellant pool on the ground expands by four times in area when the leakage velocity doubles.
A propellant pool takes shape after the Unsymmetrical Dimethylhydrazine(UDMH)leakage and obtaining the size,shape,and position information of the liquid pool is the prerequisite of UDMH leakage hazard assessment.According to the possible leakage location of UDMH container,this paper uses the VOF model to simulate the leakage process,obtains the distribution of UDMH on the container wall and liquid pool on the ground,and analyzes the influence of leakage velocity on the expansion of liquid and the pool.The results show that a slender and vertically downward liquid pool takes shape on the wall of propellant container;after 4 seconds of leakage at the velocity,a 220 cm2 semicircle liquid pool comes into being on the ground;there will be less propellant drop if leakage velocity becomes larger,and the propellant pool on the ground expands by four times in area when the leakage velocity doubles.
引文
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[17]黄智勇,陈兴,平燕兵,等.贮存条件下偏二甲肼蒸发特性[J].导弹与航天运载技术,2011(1):58-61.
[2]贾瑛,崔虎,幕晓刚,等.推进剂污染与治理[M].北京:北京航空航天出版社,2016:11-12.
[3]黄远征,黄智勇,胡继元,等.故障模型和影响分析法对偏二甲肼贮罐的安全评价[J].化学推进剂与高分子材料,2017,15(5):40-44.
[4]王树乾,钟月华,唐怡然,等.危险化学品液池扩展研究概况[J].四川化工,2009,12(1):14-18.
[5]陈家照,于文涛,廖斯宏.圆筒形受限空间偏二甲肼毒气扩散安全性分析[J].安全与环境工程,2013,20(3):130-134.
[6]Rudman M.Volume-tracking methods for interfacial flow calculations[J].International Journal for Numerical Methods in Fluids,2015,24(7):671-691.
[7]张健,方杰,范波芹.VOF方法理论与应用综述[J].水利水电科技进展,2005,25(2):67-70.
[8]Hirt C W,Nichols B D.Volume of fluid(VOF)method for the dynamics of free boundaries[J].Journal of Computational Physics,1981,39(1):201-225.
[9]陈群,戴光清,刘浩吾.阶梯溢流坝面流场的紊流数值模拟[J].天津大学学报(自然科学与工程技术版),2002,35(1):23-27.
[10]关大玮,陈香菊.基于VOF模型的溢流坝三维水流数值模拟[J].中国水运,2015,15(6):51-55.
[11]史晓蒙,吕宇玲,杨玉婷.地面输油管道泄漏流散数值模拟[J].中国安全生产科学技术,2017,13(1):90-96.
[12]陈菊芳.钱塘江涌潮作用下三维流场的数值模拟研究[D].杭州:浙江大学,2012:8-9.
[13]崔艳艳.液滴撞击倾斜壁面动力学过程研究[D].大连:大连理工大学,2010:11-12.
[14]Rabha S S,Buwa V V.Volume-of-fluid(VOF)simulations of rise of single/multiple bubbles in sheared liquids[J].Chemical Engineering Science,2010,65(1):527-537.
[15]闫宏伟.重大危险源泄漏机理剂应急封堵技术研究[D].太原:太原理工大学,2012:24-25.
[16]何思念,常华伟,文科,等.液化天然气泄漏和水面扩散过程模拟[J].化工学报,2015,66(2):213-219.
[17]黄智勇,陈兴,平燕兵,等.贮存条件下偏二甲肼蒸发特性[J].导弹与航天运载技术,2011(1):58-61.