Multiple pistons hand-off back & forth plus a hydraulic accumulator with a
pressurized bladder snubbs out the oscillations.
Similar to POGO damping in a launch vehicle.
Ken
On Fri, Apr 7, 2023 at 11:24 AM Alexander Mikhailov <
alexander.mikhailov@xxxxxxxxx> wrote:
I don't know about Flometrics piston pump, can you tell more? Also,
how pulsations were avoided? And how mode switching was done?
On 4/7/23, roxanna Mason <rocketmaster.ken@xxxxxxxxx> wrote:
Yes, I believe it was Carl at Flowmetrics that built and successfully
tested that pistol pump. No pulsations either which you might expect.
Ken
On Fri, Apr 7, 2023 at 9:55 AM Alexander Mikhailov <
alexander.mikhailov@xxxxxxxxx> wrote:
I'm sure these ideas are much older. However both LLNL and Flometrics
modern variants are convenient for applications and as a design
baseline. I also see some later articles - later than 2005 -
discussing designs similar to LLNL piston pump.
It's a rather tricky construction :) given that it doesn't use
electricity even for control functions, it automatically switches
between fill up and push down modes for each cylinder, and I don't
quite understand enough of how it does that.