We had a design meeting tonight. Major points discussed:
– Sensing equipment: for cold flow we need only 4 measurements: tank pressure, engine chamber pressure, engine inlet temperature, and thrust. Assuming adiabatic expansion of gas from the tank, d(p_tank)/dt will give us the mass flow rate out of the tank. Eric recommends that we measure thrust force by rigidly mounting the engine to a pedestal, and measuring the strain in the pedestal.
– Injector: Nick, Jeff and Filip devised an interesting centrifugal injector geometry
– Propellant Flow: James, Lachlan, and Paulo worked on picking a pipe diameter for the gas flowing from the tanks to the engine. This turns out to be very complicated.
More detailed design documentation at: https://github.com/mvernacc/pyralis/wiki