Abstract
In the 200 kA cable-in-conduit conductor (CICC) for SMES, the superconductor is cabled on the periphery of a central tube comprised of a flexible steel hose which provides a low impedance flow path for pressure relief during a quench. The central tube wall is perforated to allow good helium transport out of the cable pack. A flow experiment was done to determine the pressure drop across the unperforated flexible hose walls. A computational model for helium expulsion was developed to determine the degree of wall perforation required so that excessive pressure build-up in the cable pack does not occur. It was determined that as little as 0.1% perforation of the central tube wall provides adequate helium transport.
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Abbreviations
- ṁ:
-
mass flow rate (kg/s)
- C:
-
discharge coefficient (non-dimensional)
- A:
-
flow area (m2)
- ρ:
-
helium density (kg/m3)
- Δp:
-
pressure drop (Pa)
- t:
-
time (s)
- V:
-
volume of helium in the cable space (m3)
- M:
-
mass of helium in the cable space (kg)
- e:
-
helium specific energy (J/kg)
- Mm :
-
mass of metal in the cable space (kg)
- em :
-
metal specific energy (J/kg)
- Q̇:
-
Joule power (W)
- h:
-
helium specific stagnation enthalpy (J/kg)
- et :
-
total energy in the cable space specific to the helium mass (J/kg)
- \( \dot{q}''' \) :
-
Joule power per unit volume of cable space (W/m3)
- p:
-
helium pressure (Pa)
References
W.E. Schiesser, “The Numerical Method of Lines: Integration of Partial Differential Equations,” Academic Press, San Diego, California, 1991
D. Kahaner, C. Moler, and S. Nash, “Numerical Methods and Software,” Prentice Hall, Englewood Cliffs, New Jersey, 1989
HEPAK (version 3.0), Helium Properties Software Package, Cryodata Inc., Niwot, Colorado, 1991
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© 1994 Springer Science+Business Media New York
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Luongo, C.A., Chang, C.L., Peck, S.D., Armour, G.A. (1994). Helium Transport Phenomena in the 200 kA SMES/CICC. In: Kittel, P. (eds) Advances in Cryogenic Engineering. Advances in Cryogenic Engineering, vol 39. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-2522-6_102
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DOI: https://doi.org/10.1007/978-1-4615-2522-6_102
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