Is there any relationship between the sound emitted from a rocket engine and the amount of thrust it gets at surface temperature and pressure?
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$\begingroup$ related: space.stackexchange.com/questions/17929/… $\endgroup$– Organic MarbleJun 10, 2018 at 23:19
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$\begingroup$ In theory a rocket with two engines of the same type will be 3 dB louder than the rocket with only one. 5 engines will 7 dB louder. $\endgroup$– UweJun 11, 2018 at 17:50
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The short answer is yes! I've heard the relationship referred to as "acoustic efficiency" (i.e. how much of the power of the rocket essentially makes sound).
I don't have a lot of experience in the relevant areas, but this NTRS paper has some references that might let you explore the question. (Bonus for space archaeologists: as late as 1999 (which I infer from the reference dates and the URL) NASA was producing electronic copies of papers by printing them out (probably from Word) and re-scanning them...skewed.)
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$\begingroup$ May be they lost the file of the paper but not the printout. In an old book about Word97 problem solving I found nothing about printing to a PDF file instead of a hardware printer. $\endgroup$– UweJun 11, 2018 at 12:37