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Space Station Thermal Control System Operating Characteristics During Equipment Replacement
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English
Abstract
The International Space Station thermal control system is a one-phase ammonia loop. However, under some operating conditions two-phase flow is introduced into the system. Safe equipment operating envelopes during the two-phase flow periods, which usually are transient in nature, must be established either experimentally or computationally. The computational methodology has been developed to a point to make the computational approach feasible and can be used to establish such operational envelopes. Two-phase flow analysis of the active thermal control system (ATCS) ammonia pump was conducted to determine the safe operating envelopes. Analysis was conducted to determine the pump dynamic environment under two operating conditions: (1) fill of the entire ammonia loop during the initial on-orbit system fill; (2) fill of a radiator Orbital Replacement Unit (ORU). Critical design parameters, such as pump pressure, void fraction, and mass flow rate, were calculated for candidate system-fill scenarios. The computations were performed with the FLOW-NET program, which was modified to accommodate a stalled pump condition caused by a pump upstream pressure decrease.
Authors
Citation
Navickas, J. and Rivard, W., "Space Station Thermal Control System Operating Characteristics During Equipment Replacement," SAE Technical Paper 961605, 1996, https://doi.org/10.4271/961605.Also In
References
- Rivard, W.C. Sicilian, J.M. “FLOW-NET: Computer Simulation of Fluid Flow Networks,” Flow Science Report June 1987
- Rivard, W.C. Navickas, J. “A Two Fluid Model for the Network Analysis Program FLOW-NET for Micro Gravity Applications,” ASME-JSME Thermal Engineering Joint Conference 2 119 126 1995
- Rivard, W.C. Travis, J.R. “A Nonequilibrium Vapor Production Model for Critical Flow,” Nuclear Science Engineering 74 40 48 1980
- Navickas, J. et al “Structural Pressures Developed During Fill of Evacuated Systems,” 27th AIAA Fluid Dynamics Conference New Orleans, LA June 1996