[AR] Re: My Cavitating Venturi

From: Daniel Dyck <daniel.dyck.379ba@xxxxxxxxx>
To: arocket@xxxxxxxxxxxxx
Date: Fri, 24 Jul 2020 01:06:55 -0500

I think some photos failed to send...

Capstone venturi:
[image: StainlessVenturi.PNG]

-6 AN Venturi
[image: Demo Water Cav Venturi 1.jpg]

-6 AN Venturi Plot
[image: DemoPlot.PNG]

On Fri, Jul 24, 2020 at 12:58 AM Daniel Dyck <daniel.dyck.379ba@xxxxxxxxx>
wrote:

I figured now would be a good time to share something neat I worked on in
college.
For my capstone project our team built a permanent liquid rocket engine
testing facility, as well as a 1,000 lbf liquid rocket engine.
My job was designing/building the feed system. I built the feed system
using Swagelok, and to set the mass flow rates of our pressure fed engine,
I decided to use cavitating venturis.

I designed the venturi to be a slide in replacement for the front ferrule,
as shown in the cross section below.
(Straight barrel section fits in I.D of tube)
[image: image.png]
I believe this might be the only slide-in Swagelok compatible cavitating
venturi?

I got them machined out of stainless steel, photo of the finished product
below.
[image: image.png]

Before doing this, I made a little -6 AN cavitating venturi that ran on
water and shop air as a proof of concept. It worked great.
[image: image.png]

With the demo venturi I made the plot below. Apologies for the pixely
photo, digging through old college media:
[image: image.png]

And finally, I made an acrylic venturi where you could throttle downstream
pressure and see the results. I attempted to turn it into a GIF to share,
so hopefully this comes through alright.
https://giphy.com/gifs/dY0Cq7jWzo96ZEwT3O

<https://giphy.com/gifs/dY0Cq7jWzo96ZEwT3O>
Hope some folks found this interesting.

Daniel

Follow-Ups:
- [AR] Re: My Cavitating Venturi
  - From: Michael Clive

References:
- [AR] My Cavitating Venturi
  - From: Daniel Dyck

[AR] Re: My Cavitating Venturi

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