경유차 입자상물질 저감필터(DPF) 재생용 전기수력학적 연료 후분사 노즐의 미립화 특성 평가 및 수치해석을 이용한 액적 입경별 연소 특성 평가
Performance Evaluation of an Electrohydrodynamic Spray Nozzle for Regeneration of Particulate Matter on Diesel Particulate Filter
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Particulate matters (PM) which are collected into a diesel particulate filter (DPF) system have to be periodically removed by thermal oxidation. In this report, we fabricated an electrohydrodynamic-assisted pressure-swirl nozzle to spray diesel droplets finer. Atomization performance of the nozzle was evaluated using both experimental and numerical methods. Two types of nozzle designs, the charge induction type and the charge injection type, were tested. While the former generated diesel droplets of 400 ㎛ at an applied electric potential over 10 kV, the latter presented the droplets smaller than 23 ㎛ at an applied electric potential of 8 kV. The numerical simulation results showed that the reduced size of droplets caused higher evaporation of droplets and therefore the increased temperature, which would eventually increase the regeneration performance of the DPF system.
Abstract
Particulate matters (PM) which are collected into a diesel particulate filter (DPF) system have to be periodically removed by thermal oxidation. In this report, we fabricated an electrohydrodynamic-assisted pressure-swirl nozzle to spray diesel droplets finer. Atomization performance of the nozzle was evaluated using both experimental and numerical methods. Two types of nozzle designs, the charge induction type and the charge injection type, were tested. While the former generated diesel droplets of 400 ㎛ at an applied electric potential over 10 kV, the latter presented the droplets smaller than 23 ㎛ at an applied electric potential of 8 kV. The numerical simulation results showed that the reduced size of droplets caused higher evaporation of droplets and therefore the increased temperature, which would eventually increase the regeneration performance of the DPF system.
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