China's Space Program News Thread


by78

Lieutenant General
Some presentation slides from the China Commercial Aerospace Forum.

This slide once again confirms that a medium-to-large solid rocket of the KZ series is being developed:
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CASIC confirms that China's first real-time remote sensing satellite constellation will commence construction. The constellation will have hundreds of LEO satellites covering the planet. Once finished, the constellation can obtain remote sensing data on any part of the globe within a few minutes, instead of hours or days.
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longmarch

Junior Member
Registered Member
CASIC confirms that China's first real-time remote sensing satellite constellation will commence construction. The constellation will have hundreds of LEO satellites covering the planet. Once finished, the constellation can obtain remote sensing data on any part of the globe within a few minutes, instead of hours or days.
Does US have something like this?
 

enroger

Junior Member
Registered Member
The "Yun Long" precooled jet engine made its first hot test under 5Ma environment. The enigne is design to power the reusable OSTO & TSTO vehicles in the future.

View attachment 79416

China is hedging her bet on everything, RBCC/TBCC and precooler Turbine engine....

They seem to be going with a simpler implementation then the British Sabre engine approach, simply cooling & compressing intake air to feed it to jet turbine rather then doing oxygen liquification. IMO this is much more doable, I'm very skeptical of the thermodynamic of Sabre engine.

Basically Mach 5 intake air is first compressed by inlet shockwave and slow down to M2~M3, then cool it by another 1000k to increase density 2-3 times further slowing air-flow to cool subsonic flow so that it is good enough for turbine cycle, higher compression ratio gives better efficiency as well.

Downside is top speed is below M5 while RBCC/TBCC can go much higher. Also it must use LH2 as fuel, LH2 has very low density, which kind of rule it out of military application due to short range.
 

Temstar

Captain
Registered Member
China is hedging her bet on everything, RBCC/TBCC and precooler Turbine engine....

They seem to be going with a simpler implementation then the British Sabre engine approach, simply cooling & compressing intake air to feed it to jet turbine rather then doing oxygen liquification. IMO this is much more doable, I'm very skeptical of the thermodynamic of Sabre engine.

Basically Mach 5 intake air is first compressed by inlet shockwave and slow down to M2~M3, then cool it by another 1000k to increase density 2-3 times further slowing air-flow to cool subsonic flow so that it is good enough for turbine cycle, higher compression ratio gives better efficiency as well.

Downside is top speed is below M5 while RBCC/TBCC can go much higher. Also it must use LH2 as fuel, LH2 has very low density, which kind of rule it out of military application due to short range.
I'm pretty sure SABRE engine does not do oxygen liquidation. The same people who's working on SABRE had a previous design called the LACE engine which did in fact do oxygen liquidation and failed for that exact reason. Main improvement from LACE to SABRE is that it no longer attempts to liquidify oxygen and uses an extra helium heat exchanger loop rather than run liquid hydrogen directly through the precooler.

What I don't understand is if the precooler is the hardest part of SABRE and they had it figured out in 2018 what's the hold up with the rest of the engine. At the slowpoke rate that they're going Yunlong might beat them to the finishing line.
 

enroger

Junior Member
Registered Member
I'm pretty sure SABRE engine does not do oxygen liquidation. The same people who's working on SABRE had a previous design called the LACE engine which did in fact do oxygen liquidation and failed for that exact reason. Main improvement from LACE to SABRE is that it no longer attempts to liquidify oxygen and uses an extra helium heat exchanger loop rather than run liquid hydrogen directly through the precooler.

What I don't understand is if the precooler is the hardest part of SABRE and they had it figured out in 2018 what's the hold up with the rest of the engine. At the slowpoke rate that they're going Yunlong might beat them to the finishing line.

Ah, you're right I got it mixed up.

Still Sabre's design is much more complicated having rocket mode while Yunlong is just precooler jet turbine. From the news it looked like Yunlong has the turbine engine in place as well, pretty much the whole engine is there, very likely Yunlong will beat Sabre to the finish line, then it has to compete against RBCC/TBCC.

Edit: Yunlong's testing is way ahead as well, man its nice to have money.....
 

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