I like this idea quite a lot, but it has the drawback of creating a net torque on the engine. Running engines in pairs with opposite senses of rotation would solve the problem, or the torque could simply be countered with the RCS.
Even simpler- just use the engine(s) themselves to produce a torque to counteract the (small) rotation that the engines generate.
After all, the engines often need thrust vectoring anyway, and it's easy enough to give them enough helical attitude to balance the relatively small torque.You may even be able to mostly calibrate this away statically.
Another point to consider is that this only solves cooling problems in the chamber itself,
True, but I think it improves things- you aren't as limited by the physical properties of the interior surface of the engine- LOX can't crack, melt or otherwise fail. I've a feeling that it's applicable to smaller engines than normal regenerative cooling would be; and may be lighter and/or easier to manufacture.
......Andrew
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