Deleterious Effects of Non-Condensible Gas During Capillary Pumped Loop Startup 941408
Deprimes occuring in capillary pumped loops (CPLs) with small-diameter evaporator pumps (≤ 16 mm) were examined analytically and experimentally. The proposed deprime mechanism advanced by this paper is nucleation of a pressurized vapor bubble that can blow through the evaporator wick and lead to immediate CPL deprime or unstable operation with a likelihood of deprime at a later time. This failure mechanism is exacerbated by the presence of a non-condensible gas species like hydrogen in the ammonia working fluid. Use of a robust startup evaporator to empty the normal vapor spaces of the remaining CPL evaporators prior to startup is identified as the most effective method for obviating this failure mechanism and ensuring reliable CPL operation.
Citation: Antoniuk, D. and Pohner, J., "Deleterious Effects of Non-Condensible Gas During Capillary Pumped Loop Startup," SAE Technical Paper 941408, 1994, https://doi.org/10.4271/941408. Download Citation
Author(s):
D. Antoniuk, J. Pohner
Affiliated:
TRW Space and Electronics Group
Pages: 13
Event:
International Conference On Environmental Systems
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
SAE 1994 Transactions: Journal of Aerospace-V103-1
Related Topics:
Hydrogen fuel
Gases
Pumps
Reliability
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