充/抽气参数对密封舱气体置换性能的影响

Effect of Charging/Exhausting Parameters on Gas Displacement Performance of Sealed Cabin

针对传统的密封舱气体置换采用"充气+保压"时效率不高的问题,采用充、放气同时进行的连续气体置换方式,建立密封舱气体置换模型,采用RNGκ-ε模型对其进行数值模拟。结果表明:随着充气时间的增加,气体置换率逐渐增大,但增加的幅度逐渐减小,充气速度越大气体置换率越高;当充气压力高于密封舱内压力时,充气压力对气体置换率影响不大;当充、抽气同时进行时,在气体置换初始阶段能够增加置换率,但随着时间的增加,充、抽气方式并不能增加气体的置换效率。

In order to solve the problem that the efficiency of traditional gas displacement based on the mode of charging and holding in sealed cabin was not high,the gas displacement model of sealed cabin was established by using the continuous gas replacement mode,charging and exhausting at the same time.The numerical simulation was carried out by using the RNGκ-εepsilon model.The results show that with the increase of charging time,the gas displacement rate gradually increases,but the increasing rate decreases,the greater the charging rate,the higher the gas displacement rate;when the charging pressure is higher than the pressure in the cabin,the charging gas pressure has little effect on the gas displacement rate;charging and exhausting at the same time can increase the displacement rate in the initial stage of gas displacement,but with the increase of time,the method can not increase the efficiency of gas displacement.