COMPARATIVE ANALYSIS OF PLASMA-CHEMICAL MODELS FOR COMPUTER SIMULATION OF GLOW DISCHARGES IN AIR MIXTURES
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For citation: Tchernycheva M.V., Chirtsov A.S., Shvager D.A. Comparative analysis of plasma-chemical models for computer simulation of glow discharges in air mixtures. Scientific and Technical Journal of Information Technologies, Mechanics and Optics, 2016, vol. 16, no. 5, pp. 903–916. doi: 10.17586/2226-1494-2016-16-5-903-916
Subject of Research. We present research results for numerical modeling possibility of discharges in gas mixtures within the modern model of nonlocal plasma by creation a sequence of plasma-chemical and numerical models and comparing the results with experimental data. Method. Creation method for series of models with gradually increasing complexity has been used. It is based on a step by step expansion of the range accounted for elementary processes in nonlocal glow discharge plasma in the air. The air is approximated by the mixture of nitrogen and oxygen at low pressures under conditions suitable for experimental verification. For each iteration of plasma chemical scheme, corresponding numerical models of gas-discharge were created. The graphs of the discharge gap electrical parameters on the pressure were obtained by this method. Theoretical data obtained at each step have been compared to the experimental data and the results of previous computer models. Main Results. The model has been created that provides a good agreement with the experimentally obtained dependencies of the voltage drop across the discharge gap on the gas pressure in the areas of normal and abnormal glow discharge. By the updated model the optimum value for the coefficient of secondary electron emission from the cathode was chosen. Additionally, we have obtained the spatial distribution of the internal parameters of nonlocal plasma (longitudinal and transverse profiles of the electric potential, electron and ion densities, the electron temperature) as a subject to further experimental verification. Practical Relevance. The created models are perspective to be used for diagnosis and the setting of parameters of micro-discharges in the air. They have different applications, including developing method of electronic collision spectroscopy (CES) gas mixtures.
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Fig. 1. Experimental setup for study of gas discharge: installation diagram (a); installation overall view (b)
Fig. 2. Measurement results of the dependence of the voltage drop across the discharge gap on the magnitude of the voltage supplying the discharge circuit and air mixture pressure in the discharge gap in cases of tube pumping (triangular markers) and the air mixture puffing (markers in the form of squares) together with numerical simulation results in the framework of semi-empirical approach for modeling gas (markers in the form of lozenges). For the convenience of comparison, the data is shown in linear scale on the pressure axis (at the power voltage of the discharge circuit of 5.1 kV (a); at 4.1 kV (b); at 3 kV (c)) and logarithmic (at power supply voltage of the discharge circuit of 5.1 kV (g); at 4.1 kV (d); at 3 kV (e)), where ln(p) is the logarithm of pressure, and u(ln(p) is the dependence of the voltage drop on the logarithm of pressure
Fig. 3. Length dependence of glow discharge positive column in an air mixture on the gas pressure at various values of voltage feeding the discharge circuit: U=5.1 kV (a);U=4.1 kV (b); U=3.0 kV (c)
Fig. 9. The internal parameters of gas discharge in air mixture at lower pressure, obtained in the framework of the model (3)–(6) for voltages equal to 5.1 kV, 4.1 kV and 3 kV: longitudinal distribution of the particle density in category (a)–(c); cross section (g)–(e); transverse distribution of electric potential (f)–(i)
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