Ken,Not being a liquid man there is a lot that I don't know. Are these
cavitating ventures used as metering orifices for the purpose of o/f mixture
control or do they serve some other purpose? Barry Sent from my Sprint Tablet.
-------- Original message --------From: roxanna Mason
<rocketmaster.ken@xxxxxxxxx> Date: 7/26/20 14:26 (GMT-05:00) To:
arocket@xxxxxxxxxxxxx Subject: [AR] Re: My Cavitating Venturi Attached is a
link to Fox Valve Co., Larry Fox introduced me to the cavitating venturi back
in 1982 at our test facility at United Technologiesin San Jose. Fixed and
variable area venturis became part of my rocket carrer ever since. Prevents
hard starts which propellant valves are slammed open at zero chamber pressure
and maintain constant M-dot and O/F through a burn even with throat erosion and
other downstream pressure perturbations. As long as the tank pressure remains
constant so will flow rate up to 85% upstream pressure, somewhat less for
variable area
venturis.https://www.foxvalve.com/venturi-flow-controls/cavitating-venturi/
KenOn Sun, Jul 26, 2020 at 2:25 AM Peter Fairbrother <peter@xxxxxxxxxx>
wrote:On 25/07/2020 18:45, Terry McCreary wrote:
14 degree (full angle) carbide burrs are a standard item and
inexpensive. Long shank tools are available, as well as those with
wider flutes for cutting aluminum. >
Best -- Terry
On 7/25/2020 11:24 AM, Daniel Dyck wrote:
Thanks Theo. Machining was definitely complicated. For a college team
w/ limited resources I would highly suggest going AN, aluminum, and
designing it to slide into the flare, w/ no curves (like my waterflow
demo venturi). Additionally if your diffuser half angle is 7 deg, you
can buy 7 deg tapered end mills.