ZBOT Short Overview Presentation
cryogenic fluids. Simulated by Perfluoro-normal-Pentane (P-n-P).
through mixing and active cooling.
cryogenic storage in 1g and microgravity.
concepts for long-term storage of cryogenic fluids.
propulsion systems satisfying the requirements for long term mission
scenarios from Moon to Mars and beyond.
tank pressurization and pressure control.
pressurization and pressure control.
and microgravity data for scale-up tank design.
The following general steps are taken to prepare the tank before each test run in order to ensure that the tests are all started from a common initial state:
- Self-Pressurization Tests: Isolate test cell from
mixing/cooling loop by valving off the jet inlet and the tank outlet.
At time = 0, turn on the heater and record measurements. After a prescribed
pressurization time, turn off the heaters and go back to step #1 to
prep the tank for the next run.
- Mixing Tests: Set desired jet speed. At time = 0,
turn on the heaters allowing the tank to pressurize for a specified
time period. After the pressurization time has elapsed, turn on the
jet and continue to run until either the maximum allowable mixing time
has elapsed or the tank pressure has returned to the initial pressure
for this particular experimental run. Turn off the heaters and jet
and go back to step #1 to prep the tank for the next run.
- Subcooled Jet Cooling/Mixing Tests: Specify heater
power, jet inlet temperature and jet speed. Specify whether jet will
be active during the entire run or whether an initial pressurization
will occur. For mixing throughout, at time = 0, turn on the jet and
heaters. After a specified elapsed time, turn off the jet and the heaters
and return to step #1. For an initial pressurization, at time = 0,
turn on the heaters allowing the system to pressurize. After the pressurization
time as elapsed turn on the jet. Continue until either the maximum
allowable mixing time has elapsed or the tank pressure has decayed
to the initial pressure. Turn off jet and heaters and return to step
Contacts at NASA Glenn Research
Project Manager: William Sheredy, NASA GRC
Project Scientist: Dr. David Plachta , NASA GRC
Principal Investigator: Dr. Mohammad Kassemi, NCSER/GRC
Co-Investigator: Dr. David Chato, NASA GRC