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What's messing me up is at #4; the intake and exhaust for the chamber are uncovered at exactly the same time... one would think that in order for it to work the exhaust would only flow to the outside and the intake come into the chamber... but I presume the exhaust is under far higher pressure, because it has to be, because it didn't expand at all in the "chamber". So then in order for the intake to displace the exhaust as pictured, and the exhaust to do any useful work on blowdown, there has to be hella centrifugal force throwing all the gasses to the outside...
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