BillA , on your example of the pressure pulses in an engine, it has very little to do with the actual velocity of the charge in the Plenum. It does involve the pressure and vacuum pulses generated by the charge passing through either an expansion or contraction phase in the plenum, but the concept is based on sound pulses traveling through the fuel air mixture and arriving at the valves/port-entrance at various stages of the reciprocating cycle. This however takes for granted that the medium is able to be compressed to a certain degree..... two stroke engine exhaust design is a perfect example of this technology. It uses both the vacuum pulse and compression pulse generated by the exhaust pulse passing through the defuser section and baffle section, receptively. by changing the lengths and angle of these cones, one is able to generate a intensely impressive powerband, not too unlike that of an Turbo-charger on a 4-stroke..
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There is no Spoon....
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