Technical Feasibility of Electric Field Control for Turbulent Premixed Flames

The utilization of electric fields for the control of technical combustion processes (EFCC, Electric Field Controlled Combustion) provides an interesting approach in present-day discussions regarding reductions in CO2 emission levels and improved fuel efficiency. The technical feasibility of electric field control of turbulent premixed flames is demonstrated for the first time at technically relevant operating conditions. The technical criteria addressed include the efficiency of control at thermal powers above 50 kW, operating pressures in the order of 10 bar, air preheating, increased mixture exit velocities as well as swirl-stabilized flames. Capacitive coupling of electric fields is explored against the background of preferably non-intrusive integration into existing gas turbine systems. It is demonstrated that electric fields can be transmitted through ceramic burning chamber walls using capacitive coupling by electrodes deposited as coatings on the walls, thus avoiding sensitive mechanical parts as weak spots within the combustion chamber. No reasonable limitations are observed that might hinder a possible realization of flame control for technical combustion processes using EFCC.