Aerotech Nozzle Erosion info

[FredA]

I figure this doesn't really need to be in the research section - mods pls move if I'm wrong.

I'd like to know if anyone has a starting number for nozzle erosion in Burnsim for 54mm RCS Nozzles?

I know it's very propellant/geometry dependent, but what's a ballpark number for something like White Lightning?

Bursim wants in/sec which I assume to be the increase in radius as measured in in/sec.
Something in the 0.05in/sec seems close, but that's a guess.
Anyone know?

Thanks in advance.

 

[0011001100]

I'd love to know this too except for 18mm. My plan is to measure every nozzle I bought before and after to experimentally determine this for my propellant. But it would be nice to get a rough estimate.

 

[tbonerocketeer]

Like 0.005"/sec radius erosion or 0.010"/sec diameter erosion

Got this from someone very knowledgeable about erosive nozzles

 

[jderimig]

Haven't tried but can negative values be used to simulate slag build up?

 

[jsdemar]

Haven't tried but can negative values be used to simulate slag build up?

Nope.

 

[0011001100]

Has anyone gotten any data on this since? I've got 18mm RCS nozzles and am using the 0.005"/s as a start but am curious if anyone has done any measurements.

 

[FredA]

Best number I've been able to get is 0.004"/sec
But only have a few before/after measurements that I know to be good.
More data welcome.

 

[AeroTech]

It’s completely dependent on pressure, temperature, duration and propellant composition. Under certain circumstances erosion will be zero, in other cases it could be 0.03”/second or higher.

 

[0011001100]

Thank you both. I'll post my results in here once I've done some testing though that might not be for a while. I'll design around no erosion for now as I am using sugar though I have been slowly eroding a steel nozzle. No erosion though will give worst case for pressure so I can make sure it doesn't get too high.

 

[Burner]

There was some discussion on this in the research section, click here.