THE ADVANCED MANIPULATION OF AN ELECTROSPRAYED DIELECTRIC
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Abstract
The objective of this research is to investigate the control of sprayed gasoline using electric fields. This research was separated into three main parts including: charge repeatability, charge magnitude, and control of a sprayed injection. Using the triboelectric charging method, the dielectric was passed through two different materials and the net charge was measured. The gasoline (dielectric liquid) was sprayed into a chamber where the spray plume is observed for change in diameter with and without an electric potential applied. Four different injection pressures 103, 138, 172, and 207 kPa (15, 20, 25, 30 PSI) were used to test the charging capability of the dielectric while the injection time was kept constant. Charging results showed that the fluid could be charged at a maximum of -0.259 nC/g using the tribocharging method. The tubing section for the specified materials was lengthened to increase overall net charge. By increasing the pipe length one foot, the net charge increased. However, the magnitude increase of the overall net charge was not significant. Theoretically, if the pipe was continued to be lengthened the injection charge would increase. Entrainment of the injected profile for the charged fuel was investigated for four different test injections at 138 Kpa (20 PSI). The event was captured using a high speed camera that accrued optical data at 1000 frames per second (FPS) at a vertical observation angle. Two different testing environments with and without electric potentials applied to the injection chamber were investigated. The testing layout is as follows: Injection 1 – no electric potential applied, Injection 2 – electric potential applied 10000 V, Injection 3 – no electric potential applied, Injection 4 – electric potential applied 10000 V. Comparison was achieved by taking x and y measurements at different frame intervals during injection. Compression of the injection event was achieved over the charged section of the chamber. For injections 1 and 2, maximum displacement was found to be 1.7 mm radially for the x direction and 3.7 mm in the y direction. Maximum displacement of the comparison of injection 3 and 4 in the x and y direction was 0.9 mm and 2.0 mm respectively. All testing was completed at atmospheric pressure 101325 Pa and at room temperature 297K.