Design issues of pressure-reducing, volume-expanding silencers
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The formula is quoted from page P112 of \"Design and Calculation of Noise Control Engineering\" (4-90). The original formula is: n=3.6lgp-1, where n represents the number of pipe stages required to reduce the pressure to 1.89 atmospheres. p = The actual pressure in the pipeline before the nozzle. lg is the logarithm to the base 10. So how should we understand the combination of lgp-1?
OP, you’ve misread it. 3.6lgP is a term, then subtract 1. If P=10, then: N=3.6Xlg 10^-1 = 3.6X1-1 = 2.6; thus, a level 3 is required to achieve noise reduction.
What does a silencer in the form of expansion and pressure reduction look like? Are there any pictures?