Enhancement of the Premixed CH4/O2/He Flame Speed with Dielectric Barrier Discharge
Low-temperature plasma has been reported as quite promising in improving combustion efficiency and reducing lean blow-off limit.We adopted dielectric barrier discharge (DBD) to treat premixed CH4/O2/He and investigated the combustion characteristics of using low-temperature plasma to improve combustion efficiency.We built up a DBD plasma-assisted burner and captured the flame images of premixed CH4/O2/He gas using a camera.Flame fronts were extracted from the images.The flame speed was measured using the Bunsen burner method.This speed was compared with that of the flame with no plasma assistance to characterize the plasma assistance's enhancing effect on combustion.The results show that when the equivalence ratio varies,in the presence or absence of plasma,the propagation speed of the flame increases firstly and then decreases with increasing φ,and the maximum speed appears at φ=1.With plasma assistance,the flame speed of the premixed gas is increased by 17％～35％ when φ varies from 0.85 to 1.15,proving that plasma can enhance the combustion of premixed CH4/O2/He significantly.
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