[AR] Re: engine life (was Re: Nozzles for Amateur Solids)

  • From: "John Dom" <johndom@xxxxxxxxx>
  • To: <arocket@xxxxxxxxxxxxx>
  • Date: Wed, 14 Mar 2018 18:57:45 +0100

<troy@xxxxxxxxxxxxxxxxxxxxx>
Looking at the au in your link: Troy, I never knew you were from down under_is 
that correct?
Not that it matters so much.
John

-----Original Message-----
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Ray Rocket (Redacted sender "ar0cketman" for DMARC)
Sent: woensdag 14 maart 2018 1:50
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: engine life (was Re: Nozzles for Amateur Solids)

 Troy Prideaux <troy@xxxxxxxxxxxxxxxxxxxxx> wrote:

How would that work? A vortex should increase the heat flux to the wall via 
increased turbulence and pressure.  

Vortex flow forces heavier, denser (cooler) materials to the outside.

Lowell Randall told me that Goddard injected water tangentially into the 
chamber while using a pintle injector for propellants.  The tangentially 
injected water formed an insulating steam blanket.  Mr. Randall showed me a 
tiny biprop welded from common 2" black pipe fittings that used this method.  
Unfortunately, I don't remember the flow proportions.


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