SWIRLING FLOWS IN TUBES AND THEIR APPLICATION IN THE STABILIZATION OF ELECTRIC ARCS (UBER ROTIERENDE STROMUNGEN IN ROHREN UND IHRE ANDWENDUNG ZUR STABILISIERUNG VON ELEKTRISCHEN FLAMMENBOGEN).
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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The present paper deals with swirling air flows through tubes, obtained by tangential infeed of air. In all the tests a sharp pressure drop towards the axis is demonstrated. In tubes of the same cross section the rotary speeds decrease with increasing distance from the inlet associated with this is a shifting of the maximum rotary speed from the wall to the axis. While a backflow develops in the axis of the experimental tube of uniform cross section, one obtains the front of narrowings of the tube an annular region with a minimal or even reverse axial velocity accompanied by high rotary speed. The consequence of this is a marked underpressure in the axis. These results are also valid in a tapered wind tunnel operated with a fan. Measurements made beyond a narrowing of the tube showed an interesting result, namely, the development of two maxima of the rotary speed. Two properties of the swirling flow as applied for the stabilization of electric arcs are treated. The first is the stabilizing effect itself. The second property is the heat insulation of the tube wall under conditions of swirling flow.
- Fluid Mechanics
- Plasma Physics and Magnetohydrodynamics