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Field strength In the vicinity of a charged steam jet the electric field strength is defined only by the resulting volume charge density and the surrounding conducting bodies. The aperture angle of such a jet in its initial part is approximately 18 to 20 degrees and depends little on the pressure and type of orifice. The considered jet length ZH is represented only by that part of the jet possessing the typical conic shape. Field strength measurements close to the jet are influenced by the inevitable field distortions and only a field meter position close to the conducting surroundings guarantees a correct measurement. In geometrically simple cases a computable correction of the measured values is possible. Such corrections were carried out with the values presented. In figure 3 measured field strengths are given for two horizontal steam jets with different initial charge densities and "electrical" jet lengths zH. The field strength was measured with a constant distance to the jet contour. Curves l'and 2'in figure 3 represent the calculated field strengths according to the above explained calculations. A function of the type p = po(l+z)-n (6) was used to get an axial charge density distribution for the field computation. The calculated and measured values do agree sufficiently. Curve 3 gives the calculated field strengths for the expansion of a jet with a weak impulse but with an intense electrification as is typical of a steam jet from a leaky flange. Because of the short jet length ZH a comparatively high charge concentration took place resulting in high field strengths and drift currents. A measurement was not possible so only one value is presented. The field strengths in figure 3 cannot be compared with the results of other authors since the experimental conditions were too different. Seifert et al. (ref. 3) measured values close to a steam curtain in the range of (5...9) kV/cm. However the influence of field distortions was unknown and the geometry of the space charge cloud was not the same as in the present work. The order of magnitude of the measured values in figure 3 was also 10 kV/cm without any corrections.PDF Image | ELECTROSTATIC EFFECTS OF CHARGED STEAM JETS
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