Hey Monroe,
In terms of the impeller backside, the answers probably aren't as
simple as you're hoping. Part of it is the required clearances to
prevent contact, but there are also typically features to provide
balance for the thrust forces on the impeller. SP-8109 has a few
examples of this (section 2.5), typically ribs and some sort of seal
on the back face, or both. This gets more complicated when you start
considering thermal expansion.
As far as I'm aware, the right thing to do is either do some careful
analysis to ensure that your thrust forces all counteract (are there
any from your turbine?), or just design for far more thrust loading
than is reasonable (likely not viable for flight hardware). Do you
have bearings in mind for this?
- Peter Hokanson
On Sun, Jul 12, 2015 at 7:43 AM, Monroe L. King Jr.
<monroe@xxxxxxxxxxxxxxxxxx> wrote:
I'd like to propose a question about the distance of the backside of
the impeller from the housing.
Is there an ideal distance on the backside of the impeller and should
that surface be smooth or ribbed?
Peter H. would you be interested in running CFD on this impeller
design? Also looking for FEA analysis if anyone's interested.
-------- Original Message --------
Subject: [AR] Re: Arocket Pump Progress
From: "Monroe L. King Jr." <monroe@xxxxxxxxxxxxxxxxxx>
Date: Sat, July 11, 2015 9:20 pm
To: "Arocket" <arocket@xxxxxxxxxxxxx>
Russel Blinks render in SolidCam.
We are discussing the thickness of the back plane of the impeller and
working out shaft mounting details.
Tonight I'm assembling Eric's computer.
I found a turbocharger shop that can do balancing.
-------- Original Message --------
Subject: [AR] Re: Arocket Pump Progress
From: "Monroe L. King Jr." <monroe@xxxxxxxxxxxxxxxxxx>
Date: Fri, July 10, 2015 7:06 pm
To: "Arocket" <arocket@xxxxxxxxxxxxx>
Anthony Cesaroni's render of the pump impeller (Raw)
Our shop has 3 Phase power.
-------- Original Message --------
Subject: [AR] Re: Arocket Pump Progress
From: "Monroe L. King Jr." <monroe@xxxxxxxxxxxxxxxxxx>
Date: Thu, July 09, 2015 3:50 am
To: "Arocket" <arocket@xxxxxxxxxxxxx>
I now have the specifications of the peroxide pump from Lloyd.
Eric Gustafson agreed to do the CAD for the housing. I am shipping him
a computer to use so he does not have to use his work computer to do the
work.
Eric does CAD/FEA and CFD for a living.
I sent the files for the impeller to Russel.
Lloyd advised to do the fuel pump first and get it running and I
agreed. Also advised to run 60psi head pressure to avoid cavitation once
the pump is running we may or
I'm working on wiring the shop for 3 Phase.
-------- Original Message --------
Subject: [AR] Re: Arocket Pump Progress
From: "Monroe L. King Jr." <monroe@xxxxxxxxxxxxxxxxxx>
Date: Tue, July 07, 2015 5:21 pm
To: "Arocket" <arocket@xxxxxxxxxxxxx>
Russel Blink at Armadillo/EXOS volunteered to do the CNC machine work
while I get our equipment going.
That's the Arocket spirit! Thanks Russel!
-------- Original Message --------
Subject: [AR] Arocket Pump Progress
From: "Monroe L. King Jr." <monroe@xxxxxxxxxxxxxxxxxx>
Date: Mon, July 06, 2015 7:58 pm
To: "Arocket" <arocket@xxxxxxxxxxxxx>
I got word from Lloyd that he's working on the Peroxide pump.
Lars Osborne has dropped off the project doing CAD. Thank you Lars
for
supporting the effort that ignited this project. I will ask Eric to
pick
up the ball doing CAD unless there is another on the list that wants
to
get involved? Here's your chance to do something you may never do
alone.
Another arocket member is working on a higher res print with
ultrasonic
smoothing and I'm waiting on word about how that goes.
Another arocket member has offered to do the CNC machining for the
project. As my machines are not up and running yet.
So is there someone who will step up to do CAD?
