There is a phenomenon estimated that everyone is familiar with, that is, when the rocket launch, there will be a lot of things fall. Those things about fall in the end what is, there are many online discussions, and slowly, and will have many different versions, some say that things are tiles for blocking heat generated by friction with the atmosphere also some say that things are to rocket insulation, foam insulation there are said to be ice ...... so much to say, in the end which is correct?
It is tiles?
On the map, just when the rocket launch, you can easily see, like flying all the same, the Rockets lost a lot of splinters, this phenomenon in foreign've also caused a lot of discussion, like us, foreign small partners also very wonder: when Chinese rocket, out in the end is what God Ma ah?
Some people say that this is the tiles, heat is generated when the barrier is used rockets and atmospheric friction. Obviously, this is not a well thought out answer.
Since it is tiles, rocket why it's just to get up, when it was still low crackling away, and so when the rocket reached several times the speed of sound, you have what every other hot? So, for the figure, said tiles is wrong.
It is the ice?
There are a lot of people thought it was ice on the ground that the rocket which is equipped with a large number of low-temperature fuel, such as hydrogen oxygen and so on. These ultra-low temperature so that the temperature of the fuel in the rocket body becomes low, causing vapor in the air on the rocket body ice crystals, launch, due to vibration, have come off.
This is not to say, however, when it refers to other rocket, that's right. Saturn V rocket, the Falcon 9 rocket, such as used in the Apollo program, etc., that is ice, that is right.
So, if someone asks, rocket launchers, the fall of those things is what? If you do not specify what type, which country launched rockets, one of the answer, that is stained.
The above-mentioned Saturn V rocket, the use of liquid hydrogen and liquid oxygen as fuel, and the temperature of liquid hydrogen is minus two hundred degrees Celsius, the temperature of liquid oxygen is more than a hundred degrees below zero, these low-temperature fuel charge into the rear of the rocket body, due to the low temperature, ambient air water vapor ice crystals, attached to the rocket body, launch, due to vibration and other factors, have lower out.
Insulating foam?
Yes! When our rocket launchers, those things that just have started falling foam insulation. And this explanation from China Academy of Launch Vehicle Technology and Technology deputy director FARMING, he said that this is a measure rocket insulation. In order to prevent rocket propellant temperature is too high or too low, some parts of the rocket body attached to some insulating foam insulation, rocket launch, a fast speed, a big wind, some foam fell off, which rocket successfully launched no effect.
Our rockets, insulating foam falling never had anything, but for NASA's space shuttle, it is not such a thing.
In February 2003, when the Columbia space shuttle mission last in off stage, the foam insulation on the external fuel tank storage size of a briefcase off, hit the left wing of Columbia.
Columbia's left wing after being hit, causing damage to the tiles on the wing, to the Columbia to complete the task returns to the atmosphere, up to 1650 high-temperature gas entered through the damaged portion of the upper wing structure, eventually leading to the disintegration of the space shuttle, seven astronauts sacrifice.
Why would something out of the shuttle crash, but rather out of the rocket so powerful was not afraid? One reason is that when our rockets falling foam insulation, but also in the low speed state, even if the hit is also all right, even said that falling foam insulation during launch of the rocket, is committed intentionally in.
And Columbia, insulating foam 82 seconds after launch in the fall, when the flight speed has been very quickly, after being hit by the impact force must be very large. Insulating foam on the shuttle drop this issue has not been solved. Today, the US space shuttle has been retired and replaced by high hopes of Orion. From safety, the safety factor of the Orion spacecraft is 10 times the space shuttle. But if, Orion more advanced than the space shuttle, which is not appropriate, the shuttle is by far the most complex aircraft built by humans, when it took off like a rocket, in the outer space as spacecraft, landing like a aircraft. Future, adequate technical reserves, Security and economy are guaranteed, reusable space shuttle may also appear.
In summary, when the rocket launch, falling is what? Obviously, the case was specific analysis, different rocket, falling things will be different, it may be foam insulation can also be ice. Our rockets, mostly falling foam insulation, and foreign rockets, generally falling ice.
References:
1.http: //helios.gsfc.nasa.gov/qa_study.html
2.http: //www.cnsa.gov.cn/n615708/n620172/n620646/n2269279/167813.html
3.http: //criterioncollection.blogspot.com/2006/04/54-for-all-mankind.html
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