Measurement of Charge Density in Methane Fired Diffusion and Premixed Flames Using Electrostatic Probes

The charge density in a flame contains important information about the combustion processes that is difficult to obtain due fast, complex, and highly exothermic reactions. This paper presents study of using electrostatic probes measure methane fired diffusion premixed flames. sensing principle, practical design, performance assessment probe are presented. Comparative experimental studies with reference ion-current sensor carried out on test rig indicate fluctuation signal from arises variation flame. A dimensionless index, combining average local peak values oscillation frequency, adopted as an indicator density. Experimental results demonstrate has increasing trend fuel flowrate varying 0.80 L/min 1.20 L/min. methane-air yields decreasing equivalence ratio ranging 0.54 0.75, then increases reaches at 1.03, continues increase when varies 1.03 3.50. inner cone higher than outer for obtained suggest developed index can be used