Title :
Investigation of mixed convection caused in superconducting generators
Author :
Fuchino, S. ; Ishii, I. ; Okano, M. ; Tamada, N.
Author_Institution :
Electrotech. Lab., Ibaraki, Japan
fDate :
7/1/1996 12:00:00 AM
Abstract :
In this paper, the influence of a macro-flow, which is some kind of natural convection caused by heat-in leak in rotational cryostats, has been investigated. A macro cooling channel unit which generates a main flow counter to the buoyancy direction has been made to simulate the macro-flow influence. A high-speed camera has been used to observe the transient local convection. Also a thin film thermometer has been used to detect the transient temperature variation. As a result, some fluctuation caused by the macro-flow has been observed in the transient convection. The degradations of the transient temperature variation and the maximum heat flux have been measured
Keywords :
cooling; cryostats; electric generators; flow measurement; high-speed optical techniques; natural convection; superconducting machines; temperature measurement; thermometers; thin film devices; heat flux measurement; heat-in leak; macro cooling channel unit; macro-flow; mixed convection; natural convection; rotational cryostats; superconducting generators; thin film thermometer; transient convection; transient local convection; transient temperature variation detection; transient temperature variation measurement; Acceleration; Cameras; Cooling; Counting circuits; Fiber reinforced plastics; Heating; Helium; Sputtering; Temperature; Turbines;
Journal_Title :
Magnetics, IEEE Transactions on
