针对低温液氧推进剂在运输、储存、加注过程中可能发生泄漏的问题
开展了数值模拟研究。采用Mixture多相流模型
考虑气液两相间的滑移速度和水蒸气的相变
对液氧泄漏后地面液池、氧气浓度场和温度场的变化过程
以及环境温度、大气压力、风速等因素对液氧泄漏扩散过程的影响规律进行了研究。结果表明:液氧泄漏约35 s后
流场达到准稳定状态
液池、温度场、浓度场的分布基本不变;环境温度从278 K升高到308 K时
促进了液氧吸热蒸发的过程
地面附近最大氧气体积分数从44.71%升高到47.1%;风速从0 m/s增加到10 m/s时
加快了氧气团稀释扩散的速度
低温伤害范围从175.4 m
2
缩小到32.81 m
2
危险浓度区域从257.0 m
2
缩小到50.70 m
2
;大气压力从0.09 MPa升高到0.1 MPa时
低温伤害范围最远距离从26.5 m缩短到20.05 m
危险浓度区域最远距离从38.81 m缩短到30.82 m;大气相对湿度从20%提高到100%时
抑制了氧气团的稀释扩散
危险浓度区域最远距离从37.67 m增加到39.24 m。此项研究对后续液氧试验的开展提供了理论支撑
对液氧泄漏事故的应急处理具有指导意义。
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