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Optimal flare for reduced particle velocity
Optimal flare for reduced particle velocity
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Old 20th October 2019, 02:43 AM   #1
Droco is offline Droco
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Default Optimal flare for reduced particle velocity

Is there an optimal optimal flare rate to reduce particle (eg. horn mouth) velocity the most?
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Old 21st October 2019, 07:20 PM   #2
OscarS is offline OscarS  United States
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Maximizing Performance of Loudspeaker Ports

Too abrupt a change in velocity still leads to losses. Optimally, the flare rate should minimize turbulent eddy formation and early boundary layer separation is what I gather from it. You didn't mention if you were talking about ports or not, but I still figured you could gather information from that paper.
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Old 21st October 2019, 07:29 PM   #3
GM is offline GM  United States
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My 'knee jerk' response is Dr. Geddes' OS WG, but being designed with the goal of high directivity control, not sure if it would be optimal for a vent.

LspCad's optimal vent was a baffled flare, but don't recall what its flare shape was called. Catenoid, maybe?

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Old 21st October 2019, 07:38 PM   #4
DPH is offline DPH  United States
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Cubic expansion laws are generally pretty good for nozzles, although a speaker makes a different than normal boundary condition. But you want to know your Reynolds numbers, albeit we want them low. So "low Reynolds number nozzle design" will give you a few NASA/NACA papers for your consumption.


Do you have a CNC to fabricate the nozzle is the better question! Otherwise, probably okay to use the off the shelf ones.
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Old 21st October 2019, 08:06 PM   #5
Droco is offline Droco
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Quote:
Originally Posted by OscarS View Post
Maximizing Performance of Loudspeaker Ports

Too abrupt a change in velocity still leads to losses. Optimally, the flare rate should minimize turbulent eddy formation and early boundary layer separation is what I gather from it. You didn't mention if you were talking about ports or not, but I still figured you could gather information from that paper.
I didnt mention a port, but yes I need the info for ports too! I'm designing a Skram like subwoofer, and I'm looking into all the ways to optimally design the vents AND horn mouth. Thanks for the link!
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