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烈火五号的若干看法  

2012-05-06 17:43:25|  分类: Missile |  标签: |举报 |字号 订阅

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写的太晚了,多少有些应付的感觉:-(
烈火五号试射已经过去很久了,综合试射前后印度媒体的报道,虽然宣传上烈火五号冠以诸多形容词,但它的技术档次实在不高,只能说勉强对付而已。

发动机:号称使用了复合材料,减重应该是有效果的。不过印度材料工业常年的不给力,比中国要严重多了,居然到玻璃钢生产线还要中国援建的地步。更重要的 是,发动机性能继续猥琐,从起飞画面看推重比略小于1.5,第一级发动机推力比烈火三号基本没有变化。发动机推力小,与燃烧室压强高低和药柱设计有关,看 来他们的固体发动机水平还是很勉强,不会因为GSLV火箭有个大直径固体助推器就高起来,所谓大而不强,这不一直说的是中国么:-)既然固体发动机技术 差,那么高比冲也别指望了。烈火3和5都是靠多装药、放大发动机增加燃烧面达到的大推力,难怪性能这么不好

射程:
longlongago,曾经有人认为这是洲际导弹,射程甚至可能过万,毕竟三级导弹设计么,总不能太差。但是发射前印度媒体已经集体转向“洲际导弹”和“5000公里射程”了,这实在令人大失所望。

精度:
从一开始就没指望多高,毕竟烈火二号和烈火三号都曾买美国霍尼韦尔的激光惯导设备,国产的激光惯导,姑且不论是否就是俄罗斯货换个马甲,单说精度就不会太高,毕竟这是为2000~3500公里射程的烈火2、3设计的。烈火五号项目负责人在2010年就说了,烈火五号使用烈火三号的成熟制导系统,包括激光陀螺,惯导精度不变射程大幅增加,还能指望有什么好的精度么

弹头:本来以为5000千米射程,怎么说也验证了再入技术,哪曾想印度人自己说破了
The mission was so perfect that the missile's re-entry vehicle hit the waters of the Indian Ocean in the targeted area with an accuracy of a few metres. Dr. Saraswat said the entire mission was monitored by three ships stationed down range, telemetry and radars along the coast. The data indicated that the mission objectives were fully met. The fireball created by the explosion of the dummy payload was recorded by cameras onboard the ships
模拟弹头落水,但火球怎么回事?
结合后续的报道,提到成功在2000度高温下测试了再入技术:
What are the new technologies that the DRDO has developed for this missile?

VKS: Agni-V has taken us to a new level of technological maturity. This missile is entirely different from the Agni 3 and 4. The second and third stage booster of the missile are made entirely of composites. The third stage is a new booster that we developed. It is the lowest end of the tapered cone that ends with the warhead. That itself, in terms of composites, is a breakthrough. The navigation system is highly accurate. Don’t forget that this missile travels at over Mach 20 in its terminal stage. Both the ring laser gyros (a device that measures the orientation of the missile and helps in inertial navigation) and the accelerometer (which measures the missile’s rate of acceleration) are indigenously developed as part of the indigenous ballistic missile defence (BMD) programme. We also proved redundancies of our new onboard navigation system. A backup navigation system that was less accurate but more robust was put in place. This navigation system was supported by a unique fault tolerance software that we installed in the missile. The re-entry nose cone that contains the warhead had to be completely redesigned with new material and resins. This is because when the missile re-enters the atmosphere, it is hurtling towards the ground at over 20 times the speed of sound. Friction on the nose cone causes temperatures in excess of 2000 degrees centigrade. This system had to be proved on the ground and that was a major technological development for us.


可是5000千米射程,烈火五的小钝头再入弹头温度不会那么低的,那么....难道是烧穿了落水爆炸?

落区:发射前根据NOTAM画的落区,第三级和弹头落区很大,600X1000公里的巨大范围。虽然印度人始终在吹他们的导弹精度高,但这个落区显示他们其实没什么底气,否则就算第三级和弹头不分开画,至少可以画个小方块。
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