[AR] Re: My Cavitating Venturi
- From: "Anthony Cesaroni" <anthony@xxxxxxxxxxx>
- To: <arocket@xxxxxxxxxxxxx>
- Date: Sun, 26 Jul 2020 19:35:46 -0400
Before advancing to aft-injected hybrid motors, we used annular cavitating
venturis on head-end injection systems. They worked well in terms of stability,
especially as motors got larger.
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
http://www.cesaronitech.com/
(941) 360-3100 x1004 Sarasota
(905) 887-2370 x222 Toronto
-----Original Message-----
From: arocket-bounce@xxxxxxxxxxxxx <arocket-bounce@xxxxxxxxxxxxx> On Behalf Of
Henry Spencer
Sent: Sunday, July 26, 2020 5:41 PM
To: Arocket List <arocket@xxxxxxxxxxxxx>
Subject: [AR] Re: My Cavitating Venturi
On Sun, 26 Jul 2020, 1bcjolly wrote:
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?
As Ken said, they're for maintaining constant flow despite changes in
downstream conditions (within limits). Controlling mixture ratio is one
application -- the Apollo LM descent engine had (variable) cavitating venturis
as part of its throttling system. They can help suppress low-frequency
oscillations by breaking feedback loops, since a surge in back pressure doesn't
reduce the flow rate through a C.V. They can hold a catalyst's flow rate
constant even as chamber pressure builds up. They can stabilize performance in
an engine with an ablative throat (or a throat with a soot layer that
occasionally flakes off) whose exact throat-area history isn't fully
predictable. Etc. They do this without nearly as much pressure loss as a
plain orifice.
Henry
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