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Post by zorbeltuss on Jun 29, 2017 23:33:42 GMT
Mass flow seems to be dependent only on the first substance in the mass ratio, this means that if for example we have two engines, one which run on hydrogen and one which runs on pitch, if they both have the same oxidizer they are likely to have the same mass flow, regardless of different mass and viscosity.
Which brings me in on another related subject, quite a few of the LOx engines run the mass ratio as fuel per oxidizer instead of oxidizer per fuel, which is unintuitive and make both fuel systems and calculations harder namely the ones with: Butane, Decane, Ethane, Pentane and Propane.
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Post by cyborgleopard on Jul 1, 2017 3:22:53 GMT
While we're at it; why do bipropellant rockets only have a single turbopump? I'm not claiming an expert on rocket engine plumbing but if you're throwing liquid oxygen and (something combustable) in the chamber, but pumping them in through the same turbo won't the combustion make its way up the turbopump somewhere further up in the engine where the pipes from the two propellant tanks meet, and probably blowing up the engine in the process?
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Post by zorbeltuss on Jul 1, 2017 3:53:13 GMT
Turbo-pumps have separate propellant compartments plus a driving compartment. You'll lose a lot of efficiency separating it to the point that it isn't worth it.
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Post by someusername6 on Jul 1, 2017 3:54:45 GMT
Turbo-pumps have separate propellant compartments plus a driving compartment. You'll lose a lot of efficiency separating it to the point that it isn't worth it. It would be worth it if you are running against the material properties of your blades -- if it turns out you need to pump *a lot* of material. This is the case if you change limits.txt and try to make really big reactors; you will be bound by the fact that all blades will eventually break, so we should be able to use more pumps instead. |
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Post by zorbeltuss on Jul 1, 2017 4:04:54 GMT
Turbo-pumps have separate propellant compartments plus a driving compartment. You'll lose a lot of efficiency separating it to the point that it isn't worth it. It would be worth it if you are running against the material properties of your blades -- if it turns out you need to pump *a lot* of material. This is the case if you change limits.txt and try to make really big reactors; you will be bound by the fact that all blades will eventually break, so we should be able to use more pumps instead. Chemical Rocket turbo pumps is a very different thing from the other turbo pumps though since they are driven by pre-combustion instead of electricity, you loose out a lot of efficiency by having multiple pre-combustion chambers while several electrically driven turbo pumps are often more efficient. |
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