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第一千一百一十章 登陆火星

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在初始阶段,肯定都是靠降落伞来进行初期的减速,主要的步骤是在最后,和火星地面接触时候的减速方案。

哪怕是在地球上,这也是最难的,比如,第一位上天的加加林,虽然从天上下来了,在最后阶段,却不是呆在飞船内的。加加林在飞船已经打开了降落伞,离地面几百米的高度上,被弹射座椅弹射出去,他自己乘坐自己的降落伞,最终落地的。

在国际上,对火星探测器的降落,主要有三种方案,一种就是气囊缓冲。当着陆器在火星表面着陆前,包裹着陆器的气囊充气展开,这种着陆器,就像是蹦蹦球一样,在火星上不断弹跳,逐步降低高度,实现成功着陆。

不过,这种方案,只适用于轻质量着陆器的登陆。

另一种,就是着陆支架缓冲,利用反推火箭实现动力减速,同时,探测器伸出四个以上的支腿,支腿上有缓冲装置,着陆就和阿波罗登月飞船一样,这种方式适用于较重着陆器的着陆,同时可准确选择着陆点。

另外一种,就是空中吊车着陆。

在后世,美国把3.6吨的好奇号发射到了火星,因为太重了,必须用特殊的方式。当这好奇号以每小时2万公里高速进入火星大气层,它被装载在盾形的热保护罩中。

当探测器距离火星表面11千米高度时,先打开巨大的降落伞降低飞行速度,24秒之后,热保护罩脱离。当探测器下降到1.4千米高度时,背壳分离,探测器上的八台制动火箭点火,通过火箭反推将下降速度从每秒80米减速至每秒0.75米。

速度已经很低了,当探测器距离火星表面20米高度时,着陆器在空中几乎处于“悬停”状态,空中吊车释放出尼龙绳,将“好奇”号火星车从着陆器上吊运到火星表面,实现着陆。

好奇号最终毫发无损,在火星上展开了实验。

而现在,对苏维埃发射的这枚火星探测器来说,采用的是第二种方案,因为,核动力的火箭发动机,会提供充足的反冲力!

没有摄像机会拍摄到它的下降画面,核动力火箭点火两秒钟,调整轨道,顺着一条弧线,火星探测器就进入了火星大气层。

红色的火星大气层中,火星探测器,带着更绚烂的色彩,坠落下来,它的表面,和火气大气摩擦,变得黝黑,在距离火星表面11千米的高度上,巨大的降落伞撑开,火星探测器的速度,进一步降低!

晃晃悠悠地飞了几十秒,顶部的降落伞被割掉,尾部的核动力发动机,冒出了炽热的火焰,液氢在反应堆中被加热,喷出。

继续减速!

周围,四个支腿伸开,探测器在进一步减速下,向着火星的表面,不断地靠近,靠近。

终于,支腿和大地接触,液压缸被挤压了一下,再次恢复了平衡。

发动机已经关闭,探测器成功着陆!

探测器的一旁,一个摄像头,慢慢地伸出来,它好奇地打量着这个世界,荒凉,到处都是有些发黄的红色,天边的太阳,也仅仅是看起来发白的一个亮点而已。

当这个图像,传回到地球的时候,瞬间,测控中心里的所有人,不由得鼓起掌来!

切洛勉更是无比激动,成功了!

这次的成功,验证了核动力火箭在探测火星方面的巨大的优势!可以显著地缩短时间!那么,接下来,就需要稳步推进载人登陆火星的计划了!

使用能源号火箭,把载人的火星探测器送入轨道,在轨道上,接受另外一枚火箭,或者是和平号空间站的推进剂加注,这样,总质量超过二百吨的庞然大物,就可以飞向火星了!

与此同时,还需要有另外一架同样的航天器,一同飞往火星,这个航天器,主要是返航使用的!

整个计划,会耗资巨大!好在,安德烈元帅是完全支持的!

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