Arugela Posted March 16 Share Posted March 16 (edited) If you put a scramjet in a fitting where you can add intake to an intake. IE a prechamber before the normal intake. Can you fill it with air converted from liquid air to feed a scramjet with an artificial atmosphere? https://www.grc.nasa.gov/www/k-12/airplane/ramth.html Quote The flow exiting a scramjet inlet is supersonic and has fewer shock losses than a ramjet inlet at the same vehicle velocity. In the burner, a small amount of fuel is combined with the air and ignited. In a typical engine, 100 pounds of air/sec. is combined with only 2 pounds of fuel/sec. If a scramjet takes 100lbs of air per second per 2 lbs of fuel(not sure which type), and air is 710 less dense than liquid air why do we not feed it into a scramjet with reserves of liquid air turned back into air to make perfect potentially vacuum based scramjets? https://www.physicsforums.com/threads/liquid-air-and-compressed-air-density.975471/ Quote Densities of Normal Air is 1.225 kg/m3 at STP, whereas the density of Liquid Air is 870 kg/m3. That means liquid air is 710x denser that normal air. Is there some technological hurdle that stops this? From a fuel storage concept this is easy. The weight of storage to feed this is 50/710=0.070423= 7.0423% of the mass. This seems as ideal as possible for a rocket. Does this ratio change when using something like a sabre engine with liquid hydrogen fuel? If you take this concept and add the ability to generate hydrogen and or liquid air in flight you can just keep extending the rockets abilities potentially. At which point is it feasible to generate clouds sufficiently from a crafts body to collect the water to make some of this? If you do a tank of 183 tons of liquid hydrogen and have around 12 tons of liquid air to feed it. That is near 200 tons of fuel. Wouldn't that allow a vehicle of 600 tons to orbit and back potentially. 800 tons on takeoff and 600 for body/cargo? Is the sabre 16 or 24 tons per engine. It is 14:1 thrust to weight. But is that at 440k lbs of thrust at sea level or 660k thrust in vaccum. If it's at sea level you can do 36 engines at 16 tons each for 581 tons and around 19-24 tons of cargo depending on hull weight. Not sure how this works enough yet. Quote 9.81*3600*ln(800/600) = 10159.78007070709523344346 9.81*3600*ln(800/605) = 9866.69955050332329811207 Edited March 16 by Arugela Quote Link to comment Share on other sites More sharing options...
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