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Tank Pressurization on Starship
Remember when David Spain bragged outrageously? That was Thursday:
On 2020-05-19 8:34 AM, Jeff Findley wrote: I'm not 100% sure of the details, that's why I said they're "sources of hot, gaseous, oxygen and hot, gaseous, methane". They may use the respective exhaust coming out of the turbines of the turbopumps. One side would be mostly hot oxygen and the other hot methane. But, obviously, there would be some combustion products mixed in if they go that route. The other route would be to have some sort of heat exchanger and just gasify the LOX into gaseous oxygen and liquid methane into gaseous methane. Honestly, I don't know which way they've chosen. Jeff I did a little digging and found this "unofficial" block diagram of a Raptor with tank pressurant feed-lines shown. https://upload.wikimedia.org/wikiped...Scheme.svg.png Nifty; black type on a dark grey background. WiPi's picture of the Merlin engine didn't have that feature. If this is correct, it is as I believed, they are bleeding off a small amount of *uncombusted* pressurized *gaseous* methane and oxygen to pressurize the tanks. Thus there should be no combustion product involved here. This diagram doesn't show any heat exchangers unless they are positioned on the tanks themselves, but I suspect this drawing may be fairly accurate, because they are feeding pressurized gaseous material. I suspect directly back into the tanks. They'd get some temperature drop when transitioning to the gaseous phase. But the key is pressure and just enough to keep the tanks pressurized during operation. HTH. Thanks. That's well worth studying despite the color problems. /dps -- "I am not given to exaggeration, and when I say a thing I mean it" _Roughing It_, Mark Twain |
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