I have LOC's ejection charge baffle system that I want to install into my LOC IV. It's design uses a full coupling and I don't have that kind of room to spare. If the math is right I can cut the coupling down to 130-ish mm (don't hate on the metric, it's just a number that uses the same standard as the imperial measurement. I switch back and forth all of the time. Born and raised in TX so if I can do it anyone can)
38mm tubes in the baffle assembly.
(Pi*D2)/4 gives me exit and inlet area of the tubes - 1,134mm
Pi*D gives me circumference - 119.4mm
1,134 / 119.4 = 9.49mm. 9.5mm, close enough
9.5mm represents spacing of the exit / entrance of the tubes from the baffle plates that roughly equals the exit area of the tubes. So, in theory, no drastic increase in backpressure or baffle chamber pressure. In theory. Butted end to end (100mm) + 9.5mm the shortest I could make the assembly 110mm ish. Coupling ID is 98mm. Area of the end is 7,543mm x 110mm length = 829,726 cubic mm of volume.
But what does that do to residence time? And how much time is needed to cool the ejection charge down? The full coupling is 205mm. Naught from naught, carry the naught, that's not quite double the volume (1,546,308 cu mm for those following along at home) of the cut down baffle at it's smallest. If I triple the spacing distance to 30mm for an O.A.L. of 140mm The volume is 68% of the full coupling (1,056,020 cu mm). Is that enough and how do I know that it's enough?
38mm tubes in the baffle assembly.
(Pi*D2)/4 gives me exit and inlet area of the tubes - 1,134mm
Pi*D gives me circumference - 119.4mm
1,134 / 119.4 = 9.49mm. 9.5mm, close enough
9.5mm represents spacing of the exit / entrance of the tubes from the baffle plates that roughly equals the exit area of the tubes. So, in theory, no drastic increase in backpressure or baffle chamber pressure. In theory. Butted end to end (100mm) + 9.5mm the shortest I could make the assembly 110mm ish. Coupling ID is 98mm. Area of the end is 7,543mm x 110mm length = 829,726 cubic mm of volume.
But what does that do to residence time? And how much time is needed to cool the ejection charge down? The full coupling is 205mm. Naught from naught, carry the naught, that's not quite double the volume (1,546,308 cu mm for those following along at home) of the cut down baffle at it's smallest. If I triple the spacing distance to 30mm for an O.A.L. of 140mm The volume is 68% of the full coupling (1,056,020 cu mm). Is that enough and how do I know that it's enough?