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Numerical investigation of microgravity tank pressure rise due to boiling
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Ibrahim, Mounir Kassemi, Mohammad Kartuzova, Olga Hylton, Sonya |
| Copyright Year | 2015 |
| Description | The ability to control self-pressurization in cryogenic storage tanks is essential for NASAs long-term space exploration missions. Predictions of the tank pressure rise in Space are needed in order to inform the microgravity design and optimization process. Due to the fact that natural convection is very weak in microgravity, heat leaks into the tank can create superheated regions in the liquid. The superheated regions can instigate microgravity boiling, giving rise to pressure spikes during self-pressurization. In this work, a CFD model is developed to predict the magnitude and duration of the microgravity pressure spikes. The model uses the Schrage equation to calculate the mass transfer, with a different accommodation coefficient for evaporation at the interface, condensation at the interface, and boiling in the bulk liquid. The implicit VOF model was used to account for the moving interface, with bounded second order time discretization. Validation of the models predictions was carried out using microgravity data from the Tank Pressure Control Experiment, which flew aboard the Space Shuttle Mission STS-52. Although this experiment was meant to study pressurization and pressure control, it underwent boiling during several tests. The pressure rise predicted by the CFD model compared well with the experimental data. The ZBOT microgravity experiment is scheduled to fly on February 2016 aboard the ISS. The CFD model was also used to perform simulations for setting parametric limits for the Zero-Boil-Off Tank (ZBOT) Experiments Test Matrix in an attempt to avoid boiling in the majority of the test runs that are aimed to study pressure increase rates during self-pressurization. *Supported in part by NASA ISS Physical Sciences Research Program, NASA HQ, USA |
| File Size | 1569018 |
| Page Count | 25 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20150023104 |
| Archival Resource Key | ark:/13960/t6935v24b |
| Language | English |
| Publisher Date | 2015-11-11 |
| Access Restriction | Open |
| Subject Keyword | Pressure Rise Boiling Cryogenic Fluid Storage Superheating Computational Fluid Dynamics Unstructured Grids Mathematics Boundary Conditions Time Dependence Numerical Analysis Gravitational Effects Cryogenic Tanks Microgravity Prediction Analysis Techniques Pressure Regulators Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Presentation |
