China's Space Program News Thread

[escobar]

When the capsule traversed the atmosphere, the instruments have measured over 2000°C outside of the shell, and 30°C within the capsule.
The thermal protection layer of the capsule of Shenzhou-9 has a thickness of 25mm.

 

[stardave]

When the capsule traversed the atmosphere, the instruments have measured over 2000°C outside of the shell, and 30°C within the capsule.
The thermal protection layer of the capsule of Shenzhou-9 has a thickness of 25mm.

You can see from the video, during a stage of descent, SZ-9 ejected a piece of metal from the bottom, I think that was the thermal layer, and they don't need it anymore once it is too close to the ground and deployed the parachute.

 

[no_name]

How do they measure temperature outside the capsule? Just curious.

 

[stardave]

How do they measure temperature outside the capsule? Just curious.

Not that difficult, they have sensors nearby.

 

[no_name]

I guess what I'm asking is how does sensors that measure 2000 °C works.

 

[escobar]

A very good article from "Science Magazine": A new down for china's space scientist

 

[stardave]

I guess what I'm asking is how does sensors that measure 2000 °C works.

I don't know the exact detail, but I am sure this is not really high tech science, most of the country in the world can do this. And I assume they don't do it with a mercury thermometer, maybe infrared sensors that indirectly measure it by the color of the wavelength that shows up.

 

[escobar]

Lubricants for Space Components

Lanzhou Institute of Chemical Physics, part of the Chinese Academy of Sciences, has recently rolled out a silicon hydrocarbon compound, desirable for lubricating the moving parts of space components, thanks to its excellent thermal decomposition and high/low temperature performance.

 

[Mysterre]

For the most point the American space program was and is different from the military program. And like I said planetary exploration has no military value what so ever. I challenge you to tell me the military value of a mission to Venus or Mars. Some things are just pure science. Don't tell me you wouldn't like to see a mission to explore Europa and determine if there is life under all that ice.

Oh come on. Don't start pulling this weasely stuff on me. I am referring to the US MANNED space program. I feel I have been very specific about this point several times now, so you continuing to miss the point sounds at this juncture to be a deliberate oversight. But that's okay, I can see that you do not want to admit the obvious. Soldier on, good sir, soldier on.

 

[escobar]

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Thanks to many-year efforts, a research team, led by Prof. ZHANG Tao of Beijing University of Aeronautics and Astronautics, has landed major progresses in preparing metallic glass and associated mechanism studies, and rolled out the amorphous alloy materials desirable for making stretching mechanisms for satellite solar cell arrays.

Researchers established an amorphous alloy lab for the purpose, through which they discovered a range of novel amorphous alloy systems, and improved their understanding of the mechanisms that forge metallic glass.

In addition, they have worked out metallic glass containing light alloy, including aluminum, magnesium, and titanium, enjoying the merits of high strength, low melting point, and fine fluidity, desirable for preparing the parts and components in sophisticated shapes, like plastics.

Researchers developed the amorphous alloy materials desirable for making satellite solar array’s stretching mechanism. In the laboratory, solar array’s 20cm long titanium metallic glass spiral rod is able to reach the length of 2m when stretched out.

Researchers also mixed metallic glass powder with lubricants to raise lubricating performance, taking advantage of high hardness, high flexibility, and low friction of metallic glass.