The Japanese have their bleed expander cycle, which is replacing the GG of the open cycle with the expander, but still dumping the gases after they've passed through the turbine, in an open cycle. Apparently they can take it to something like 1,500kN. I guess it won't have good T/W, then?
From a systems level too, you might be better off investing your money in improved structures to reduce vehicle inert mass (i.e. the Boeing 787's fuel efficiency is mostly due to structure).
Not over-expansion?cheers, Martin
When designing a catalyst pack for decomposing peroxide or hydrazine, is there any attention given to the aerodynamics of the flow?For example, would a tapering, or waisted, pack act like a venturi. That is, would it reduce the pressure in the flow. Reducing pressure in a reaction thats products have more mols (and consequently more volume) than the starting reactants is an additional mechanism (additional to the catalysis on the pack surface) to drive the reaction in a forwards direction.And, can we even assume that mixed phase flows obey the Bernoulli equation that explained the venturi effect?
LOX cooling has been used experimentally, and apparently it's not as dangerous as it sounds, even if there are cracks. I came across a paper describing this on NTRS once. Skylon's SABRE is also meant to use LOX cooling.
Why isn't oxidizer (LOX) never used to regeneratively cool the camber? It has a good deal more density to absorb the heat. Is it because it has bigger pressure losses? Because the risk of phase change?The vortex method does use it, obviously. But has none of those issues.