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长征五号首次发射全过程:倒计时10秒中断3次

2016-12-13 21:11:40   

程序可以往下走了,大厅的气氛又轻快起来。我再次暗暗祈求别再有什么意外了。15:48:20,液氢大流量加注完毕。指挥部成员好像松了一口气,轻松站起,转移战场,到10层指挥大厅就座。17:00时,我去了加注现场。巨大的排气声和呼啸的风声,让我突然感受到一丝冷意。这是我早已熟悉的那种“冷”。一个月前,我到过这里,是加注系统的“管家”李建军带我来的,他把低温燃料系统给我介绍了一遍。与他的声音一起留在我脑海的还有一个面容清瘦的江南女子,她叫陈虹,浙江大学热物理系低温工程专业的高材生。这个看上去秀秀气气的杭州女子身上有种超乎常人的定力。为研发低温燃料系统与贮罐,她带领的团队付出了10年多的时间。“十年磨一剑”,我能从陈虹脸上的雀斑中读到艰辛和不易。

回到508时,见走道上站满了人。我心里一激灵:又发生了什么?小会议室的门紧紧关闭。我的双腿突然变沉,绕到指挥大厅才听说:一级循环预冷失败。光是“失败”两字,你就能预知事态的严重性。“暂停液氧排放,暂停煤油充填。各系统保持状态,暂不进入-1小时程序。”专家们紧急商讨对策:“这次温度降不下来,我们就终止。”“你们先做,最后一分钟都来得及。”“只有半个小时了。这半个小时做完,还不成,只好放弃。”所谓窗口,就是运载火箭发射比较合适的一个时间宽度。整个窗口只有2小时40分,前面耽搁了1小时,只剩下1小时40分了。现在进入了-1小时,又停下来,窗口还撵得上吗?若失去窗口,小心翼翼喂进火箭肚子里的东西,得让它吐出来,整个程序得逆着走。凡是逆向的,难度都很大,就像逆流而上的船。

17:36,氢循环泵增压预冷和排放预冷效果仍不佳……01指挥员下达了“各号保持状态,暂不进入-1小时程序”的口令。“若到19:30,一级液氢发动机预冷仍不正常,考虑进入终止发射程序。这是指挥部的决策。”陈虹记录本上这段话,事后我读了3遍,读第2遍时,眼睛发潮了:终止发射程序,意味着400多方的液氢,500多方的液氧需要泄回,发射场将接受异常严峻的考验,中国航天将面临前所未有的技术挑战。

19:33,传来好消息:一级氢泵轴温度终于下降。01指挥员下达令人欢欣鼓舞的口令:“设定点火时间为:20:40:00。”当听到这一消息时,指挥大厅凝固的空气忽然像注入一股清流,似乎能听到冰河化开时悦耳的“叮咚”声。稍显混乱的秩序恢复了正常。我大大地呼出一口气,感觉紧张皱巴成一团乱麻的心,瞬间像花儿一样绽放。

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