In order to reduce the combustion exhaust such as particulate matters from old engines of heavy diesel vehicles in urban area, various efforts including improvement of fuel atomization have been explored. The flow dynamics of diesel fuel injected into the nozzle was analyzed using Fluent v.18.0 of A...
In order to reduce the combustion exhaust such as particulate matters from old engines of heavy diesel vehicles in urban area, various efforts including improvement of fuel atomization have been explored. The flow dynamics of diesel fuel injected into the nozzle was analyzed using Fluent v.18.0 of ANSYS’s numerical analysis program in terms of various operating conditions. In addition, we tried to evaluate the performance of harmful exhaust gas reduction through the field test. When FAD(Fuel Activation Device) was installed, the pressure of the diesel fuel flowing into the nozzle was reduced by half than without FAD, and the inflow rate was 316 m/s, which became 29 m/s lower. FAD with the above characteristics aided to form cavitation more effectively than the conventional one, so that it caused not only to the wall boundary of the nozzle but also to the inside of the nozzle. As a result, it showed that fuel spray at the outlet of the nozzle with 1.2 times higher flow velocity for the same mass flow rate had a spray tip penetration of 1.04 times larger than that of the conventional one with a nozzle diameter of 1 mm. Compared with the cavitation development process in the nozzle according to the inlet pressure, it was confirmed that FAD at the same inlet pressure could facilitate cavitation effects of 1.09 times longer than the conventional one. The backpressure of the engine cylinder proved to reduce the cavitation length. In case of 10 MPa, the length of the formed cavitation flow increased by 1.06 times as the pressure decreased by 2 MPa. Changes in viscosity and density of fuel did not clearly affect cavitation development. To confirm the efficiency of pollutant reduction from diesel engine according to FAD installation, a field test was conducted. As a result, it showed a maximum reduction rate of 42% of PM10, 50% of CO, 13.4% of NOx. As a result of the investigation, it was revealed that the load and fuel efficiency could be improved by actual application of FAD. It was also confirmed that the output efficiency did not decrease because the difference in engine RPM was very small, and the fuel consumption was the highest reduction of 26%. In conclusion, the feasibility of FAD was proven to reduce the emission of diesel combustion pollutants an developing cavitation effects.
In order to reduce the combustion exhaust such as particulate matters from old engines of heavy diesel vehicles in urban area, various efforts including improvement of fuel atomization have been explored. The flow dynamics of diesel fuel injected into the nozzle was analyzed using Fluent v.18.0 of ANSYS’s numerical analysis program in terms of various operating conditions. In addition, we tried to evaluate the performance of harmful exhaust gas reduction through the field test. When FAD(Fuel Activation Device) was installed, the pressure of the diesel fuel flowing into the nozzle was reduced by half than without FAD, and the inflow rate was 316 m/s, which became 29 m/s lower. FAD with the above characteristics aided to form cavitation more effectively than the conventional one, so that it caused not only to the wall boundary of the nozzle but also to the inside of the nozzle. As a result, it showed that fuel spray at the outlet of the nozzle with 1.2 times higher flow velocity for the same mass flow rate had a spray tip penetration of 1.04 times larger than that of the conventional one with a nozzle diameter of 1 mm. Compared with the cavitation development process in the nozzle according to the inlet pressure, it was confirmed that FAD at the same inlet pressure could facilitate cavitation effects of 1.09 times longer than the conventional one. The backpressure of the engine cylinder proved to reduce the cavitation length. In case of 10 MPa, the length of the formed cavitation flow increased by 1.06 times as the pressure decreased by 2 MPa. Changes in viscosity and density of fuel did not clearly affect cavitation development. To confirm the efficiency of pollutant reduction from diesel engine according to FAD installation, a field test was conducted. As a result, it showed a maximum reduction rate of 42% of PM10, 50% of CO, 13.4% of NOx. As a result of the investigation, it was revealed that the load and fuel efficiency could be improved by actual application of FAD. It was also confirmed that the output efficiency did not decrease because the difference in engine RPM was very small, and the fuel consumption was the highest reduction of 26%. In conclusion, the feasibility of FAD was proven to reduce the emission of diesel combustion pollutants an developing cavitation effects.
주제어
#Diesel exhaust, Cavitation, Fuel atomization, PM, CFD, Urban air pollution
학위논문 정보
저자
최상인
학위수여기관
경희대학교 대학원
학위구분
국내석사
학과
환경응용과학과
지도교수
조영민
발행연도
2018
총페이지
x, 101 p.
키워드
Diesel exhaust, Cavitation, Fuel atomization, PM, CFD, Urban air pollution
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