ANALYSIS OF DISCHARGE CIRCUIT SCHEMES OF CAPACITIVE IGNITION SYSTEMS WITH ONE CONVERTER FOR TWO PLUGS

Relevance Capacitive ignition systems with partial redundancy, i.e. with one converter for two plugs, can be used for small-size gas turbine engines (GTE) as part of turbocharger starters, auxiliary power units and special-purpose aircraft engines with light startup conditions. Such ignition systems have considerably less weight and dimensions at an acceptable level of reliability in comparison with classical two-channel systems. There are quite a lot of circuit solutions for ignition systems with one converter for two plugs, differing in the way of connection of two semiconductor plugs and features of discharge processes in normal and emergency modes of operation. It is of practical interest to identify and analyze the regularities of discharge processes in such ignition systems to substantiate their applicability in gas turbine engines for various purposes. Aim of research Comparative evaluation of efficiency indicators of different variants of schemes of capacitive ignition systems with one converter for two plugs to substantiate the possibility of their use in small-size GTE of various purposes. Research methods The researches were carried out by the method of comparative analysis of regularities of discharge processes in capacitive ignition systems with one converter for two plugs in normal and emergency modes of operation on the basis of known provisions of electrical engineering. Results Regularities of discharge processes of oscillating and aperiodic types in different variants of schemes of capacitive ignition systems with one converter for two plugs at parallel and series connection of plugs are revealed, comparative evaluation of their efficiency indicators is given. Recommendations for the use of such ignition systems are presented.