1 Reply Latest reply on Nov 20, 2016 12:42 PM by David Woodruff

Flow Simulation Issues on Rocket Engine

Alexander Sharp Oct 26, 2016 4:16 PM

I'm trying to do a computational fluid dynamics test on this rocket engine chamber and nozzle, but for some reason whatever I set my outlet environmental pressure to be, it makes the whole chamber that pressure, which is not true with an inlet mass flow of 4.1lb/s and an initial condition of 450PSI and 6766 DEG Rankine. I don't think it's relevant to helping me, but the working fluids are 70% Liquid Oxygen and 30% Liquid Propane.

Initial Fluid parameters

Inlet Fluid Parameters

Outlet Fluid Parameters

Flow Pressure Results

Any help would be greatly appreciated, I've followed many tutorials to the tee yet I haven't been able to produce sensible results.

Re: Flow Simulation Issues on Rocket Engine

David Woodruff Nov 20, 2016 12:42 PM (in response to Alexander Sharp)

Alex, I think you are mixing fluids. FlowSim cannot do combustion or the phase changes from liquid to gas. Just model it as gas [air] only. Apply high pressure to the inlet face - not the fuel mass flow rate. Environment pressure at the outlet. Here is a quick internal example with FloXpress. You can do this as an external flow and just add the inlet higher pressure. You can see that 1013250 Pa ~147 psi generates supersonic flow. Hope this helps!
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