Many fuels will start to coke, that is they solidify when they're exposed to heat, such as in a regenerative cooling loop, particularly those that are commercially available like petroleum. Are there any additives, particularly those which have the ability to erode the particles, that can prevent or at least suppress coking problems?

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    $\begingroup$ Ignition doesn't mention this, though it only goes up to about 1970. It's probably hard to erode carbon deposits with something that won't blow up the engine. $\endgroup$ – ikrase Sep 11 '20 at 8:16
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    $\begingroup$ Adding corrosives to the propellants sounds kind of hard on the plumbing. $\endgroup$ – Organic Marble Sep 11 '20 at 12:31
  • $\begingroup$ "Many fuels will start to coke" what are these many fuels? Hydrogen and methane does not, kerosene does, RP-1 a little may be. Hydrazin ? Any other liquid fuel still in use today? Alcohol would not coke but has not been used since 50 years. $\endgroup$ – Uwe Sep 11 '20 at 14:37
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    $\begingroup$ Doesn't methane coke in nuclear thermal rockets? $\endgroup$ – ikrase Sep 12 '20 at 2:45

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