Harmonic Dampening inside of a combustion chamber

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Discussion Overview

The discussion centers around the topic of harmonic dampening within combustion chambers, specifically focusing on augmented injector plates and chamber geometry to mitigate vibrations. Participants seek literature and resources related to this subject, as well as recommendations for forums dedicated to full-size rocketry.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant requests literature on harmonic dampening in combustion chambers, noting a scarcity of resources.
  • Another suggests searching for "combustor rumble" but mentions that available information may be commercially confidential.
  • A participant reflects on historical failures in rocketry related to nozzle critical limits, indicating a lack of expertise but referencing knowledgeable individuals at NASA.
  • One participant proposes the concept of Helmholtz Resonators as relevant to the discussion and provides links to NASA and Defense Technical Information Center resources.
  • Another participant shares a link to a forum dedicated to full-size rocketry, suggesting it may be more aligned with the original poster's interests.

Areas of Agreement / Disagreement

Participants express a general interest in the topic and share resources, but no consensus is reached on specific methods or solutions for harmonic dampening. The discussion remains exploratory with multiple viewpoints and suggestions presented.

Contextual Notes

Some participants reference technical terms and concepts without fully defining them, and there is an acknowledgment of the potential limitations of available information, particularly regarding commercial confidentiality.

Who May Find This Useful

This discussion may be useful for individuals interested in combustion chamber design, vibration reduction techniques in rocketry, and those seeking community resources for full-size rocketry.

Algorithmic
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Could anyone recommend any literature on harmonic dampening inside of a combustion chamber (augmented injector plates and chamber geometry to reduce vibration)? It seems resources are rather scarce on the subject so if anyone knows of any websites, books, papers, etc. that might be helpful, I would be very appreciative.

Also, does anyone know of a good active forum dedicated to full size rocketry? I've been running across nothing but model forums in my search which doesn't pertain to my current goal.

-Darren Levine
 
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Try googling for "combustor rumble", if you haven't done that already.

But the only "hard information" I have come across on this is commercially confidential, which isn't any help to you, unfortunately.
 
Well, I think in the old days, 99% of the failures blew up on the launch pad as they exceeded hoped-for nozzle critical limit failure limits. I don't even know if that's the right terminology.

I'm not a rocket scientist, but I know quite a few of these sorts of folks who are experts in nozzle geometries live and work there. At NASA.
 
Algorithmic said:
Could anyone recommend any literature on harmonic dampening inside of a combustion chamber (augmented injector plates and chamber geometry to reduce vibration)? It seems resources are rather scarce on the subject so if anyone knows of any websites, books, papers, etc. that might be helpful, I would be very appreciative.

If I understand your question properly, you're asking about Helmholtz Resonators and such.

http://en.wikipedia.org/wiki/Helmholtz_resonance

You might check out NASA Technical Report Server:

http://ntrs.nasa.gov/search.jsp

or Defense Technical Information Center

http://www.dtic.mil/dtic/


Algorithmic said:
Also, does anyone know of a good active forum dedicated to full size rocketry? I've been running across nothing but model forums in my search which doesn't pertain to my current goal.

Have you checked out aRocket:

http://exrocketry.net/mailman/listinfo/arocket

Cheers,
Ed L
 
Last edited by a moderator:
Thanks for the help guys, this will definitely help me move in the right direction! I'll do some more research to see if I can get a result.
Thanks,
Darren Levine
 

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