Hi Charlie, the pressure difference or delta-P, where the pressure in the
propellant tanks is higher than in the chamber, if chambe pressure ever
gets too high propellant flow slows down. This can lead to flow
oscillations and low frequency combustion instability if the injector
delta-P is too loo.
With a delta-P approx 15% of Pc this instability it prevented.
Cavitation venturis further stabilizes a hydraulic system but induces ~15%
unrecoverable pressure loss.
Hope that helps,
Ken
On Fri, Jan 1, 2021 at 4:34 PM Charlie Jackson <charliejackson8629@xxxxxxxxx>
wrote:
I’m currently designing my own liquid-fuel rocket engine and, when drawing
up the injector, I can’t get my head around what’s stopping hot combustion
gas from travelling through the pipe lines because of the pressure
difference. And could this be prevented with simple non-return valves?
Kind regards,
Charlie