大流量氢气的排放与扩散研究  

Research on Venting and Diffusion of Large Flow Hydrogen

作　　者：吴光中[1] 李久龙[1] 高婉丽[1] 姜联东 

机构地区：[1]北京航天试验技术研究所,北京100074

出　　处：《导弹与航天运载技术》2010年第5期51-55,共5页Missiles and Space Vehicles

摘　　要：提出了试验与软件仿真计算结合的方法分析试验台贮箱大流量氢气排放的安全性,以试验期间测量的压力、温度作为Fluent软件仿真计算的边界条件及初始条件,分析试验台氢贮箱排放氢气的流场及温度场,获取排放管出口的氢气流速及温度,评估氢气排放的安全性。对于排放阀出入口压力之比远小于0.528的情况,采用孔板的超临界限流法估算氢气排放流量、流速,其结果能与前一种方法相互印证。在仿真计算的基础上,运用高架连续点源扩散的高斯模式,初步分析了氢气排入大气的扩散特性,通过数值软件Matlab分析计算并绘制了氢气危险浓度的空间分布,以确定氢气排放管附近的安全区域。This paper presents a method that we analyze safety of large flow hydrogen venting in a test stand liquid hydrogen tank by means of testing and simulation.Temperature and pressure measured in test are taken as boundary and initialization conditions to compute with Fluent software.Flow field and temperature field of hydrogen in vent-pipe at the top of tanks are analyzed to obtain hydrogen velocity and temperature at the exit of the vent-pipe,which helps to evaluate safety during hydrogen venting.For the case that the ratio of export pressure to import pressure in the vent valve is much less than 0.528,nozzle ultra-critical throttle method could be adopted to calculate hydrogen flow and velocity.The result of two methods can be proved each other.Based on foregoing Fluent simulation,preliminary analysis on diffusion characteristics after hydrogen’s venting into atmosphere is conducted by applying Gauss diffusion mode of overhead continuous point source,then hydrogen dangerous concentration area is calculated and plotted with Matlab numerical software,which helps to determine safety area near the vent pipe.

关 键 词：火箭发动机 氢气 高空排放 扩散 

分 类 号：V43[航空宇航科学与技术—航空宇航推进理论与工程]