ISSN:
1432-0630
Keywords:
52.25.Lp
;
52.30.+r
;
52.80.Mg
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract A high current arc (1–16 kA) of 5–20 ms duration is investigated, which rotates between two annular electrodes of variable distance (5–16 mm) at elevated pressures (0.1–1 MPa) in SF6. The are is driven by the magnetic field of two ring-shaped coils in cusp geometry, one on either side of the electrodes. Both experiments and theoretical models concentrate on the investigation of the hot wake. The temperature, velocity, and size of the wake are determined by schlieren photography, streak records, and shock waves. A simple model is developed which yields a quantitative picture. The immediate surroundings of the transversely blown are can be described in terms of sucking in cold gas with associated heating and expansion, whereas the far-field region is governed by turbulent entrainment. The model involves only one empirical parameter: the entrainment coefficient α, which turns out to have a value of about 10−3.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00885936
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