Analysis of a Cylinder-Wire-Cylinder Electrode Configuration during Corona Discharge K. KANTOUNA G.P. FOTIS K.N. KIOUSIS L. EKONOMOU G.E. CHATZARAKIS [email protected][email protected][email protected][email protected][email protected]ASPETE - School of Pedagogical and Technological Education, N. Heraklion, 141 21 Athens, Greece Abstract: A cylinder-wire-cylinder electrode configuration was simulated by implementing open source Finite Element Method Magnetics (FEMM) software. The analysis consisted of two cylinders, one is charged with 1000V, while the other is grounded. Among the two cylinders there is a wire which is charged with 1000V. The maximum and the minimum electric field strength versus the distance between the three electrodes were determined. Field flow pattern has been visualized and the stored energy was measured with the FEMM software. Key-Words: Corona discharge, Electro-hydrodynamic (EHD) flow, Field flow pattern, Finite Element Method Magnetics (FEMM), High voltage, Stored energy 1. Introduction Kallio and Stock [1] made some experimental and simulation investigations with the finite element models finding that the electro-hydrodynamic (EHD) flow, which exists in electrostatic precipitators is a very complex flow phenomenon, strongly depended upon the corona discharge and precipitator inlet velocity. Dumitran et al. [2] investigated a cylinder-wire-plate electrode configuration under the corona discharge effect. Their results were that the non-uniformity of the electric field and the charge injection are depending on the geometry of the electrode system and affect the electric field and the space charge density distribution in the inter-electrode gap. Stishkov and Chirkov [3] used ANSYS to simulate a needle-plane electrode system. That was an effort to analyse the field’s velocities and the electric characteristics of the EHD flow. They found that the EHD flow in the electrode system has a large volume charge density value and as a result a quite strong transverse electric field. Colas et al. [4] made an experimental setup of a wire-cylinder-plate electrode configuration and tried to maximize the power supplied to the flow so as to increase the acceleration. In relation to wire-wire electrode configuration they concluded that their setup increases the ionic wind velocity and the thrust. An electrostatic precipitator with a circular tube and a wire electrode mounted in the centre of the tube was modelled from Farnoosh et al. [5], so as to determine the collection efficiency for conductive diesel exhaust particulates. The wire was charged with negative high dc voltage and the tube was grounded. They found that by increasing the gas residence time, i.e. decreasing the inlet velocity, the particle charge-to-mass ratio increases and the particle removal efficiency increases too. In this work a cylinder-wire-cylinder electrode configuration has been simulated by implementing FEMM software. The maximum and the minimum electric field strength versus the distance between the three electrodes were determined, the field flow pattern has been visualized and the stored energy was measured with the FEMM software. 2. Wire-wire electrode configuration analysis A wire-wire model was used for the theoretical maximum electric field strength (E max ) approach with the use of Peek’s formula [6]. where: a is the radius of the electrodes and x, y are the coordinates of the first electrode, while the coordinates of the second are (x=0, y=0). The maximum electric field strength appears in the field for y=0. Hence: (1) Latest Advances in Information Science, Circuits and Systems ISBN: 978-1-61804-099-2 204
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Analysis of a Cylinder-Wire-Cylinder Electrode Configuration during
Corona Discharge
K. KANTOUNA G.P. FOTIS K.N. KIOUSIS L. EKONOMOU G.E. CHATZARAKIS