Cryogenic flows with LN2 at varying pressures. First 30 psi run was completed with the auto sequence, the runs afterwards were done manually. The conditioned label on the later runs indicates when a conditioning experiment was tried with the LN2. It was pressurized to 120 PSI in the tank and held there until it reached its new boiling point. This pressure was chosen as it's the target throat pressure of the LOX side venturi. Ensuring the liquid matches this boiling point would hypothetically mean it should cavitate in the venturi like LOX will during an actual hot fire.
IMPORTANT NOTE: The "burn time" of both the conditioned and non-conditioned flows is ~20 seconds. At nominal mass flows the Ox tank drains in ~9 seeconds. This disparity (despite the high pressure differential) is due to the fact that the fuel venturi was swapped with the LOX one. The much smaller throat of the fuel venturi reduced the mass flow rate and likely caused the LN2 to cavitate. This was unknown at the time of the test.
1 авг 2024
