| Summary: | 碩士 === 國立交通大學 === 機械工程系所 === 106 === The present study investigated the application of non-thermal plasma discharges to the ignition of a jet diffusion flame. The flame was fueled with methane and had a nominal Reynolds number of Re = 2000. The volume flow rate of co-flow air was fixed at 100 LPM. Two different configurations of electrode arrangement were tested: opposed rod electrodes with pin tips and opposed wire electrodes.
Results showed that opposed wire electrodes (made of tungsten) successfully ignited flames, but not opposed rod electrodes. It was shown that the ignition probability was increased with the energy density deposited in plasma. The ignition probability was seen to decrease, as the plasma was further away from the fuel nozzle. On the other hand, the ignition probability was increased when the discharge was close to the stoichiometric mixture fraction. However, the probability could be affected by the polarization of the fuel nozzle if the discharge was close enough to the nozzle. Results of the most probable ignition time were consistent with those of the ignition probability, i.e. the larger the ignition probability was, the shorter the ignition was.
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