흡기매니폴드 노즐이 자동차 배출가스 및 성능에 미치는 영향

Abstract

Abstract

Influence of the Nozzles in Intake Manifolds on Performance and Exhausted Emission

Kim Man Jae Advisor : Prof. Choi, Byung-Ky Department of Mechanical Engineering, Graduate school of Chosun University

Today, there are more than one car per household, and it has become an indispensable necessity for our lives. However, the exhausted emissions after burning on fossil-fueled vehicles have an adverse effect on the human body which is polluting the atmosphere and causing many environmental problems. Accordingly, countries are increasingly interested in environmental pollution caused by automobile exhaust gas, and they are forcing regulations to be tightened in exhaust gas. exhaust gas. In the EU, EURO 6 has been implemented since 2014, which is more strengthened than the previous regulation on vehicle emissions (EURO 1-5). Therefore, in this study, the nozzles were applied in order to improve the flow performance of the intake manifold. First, the flow analysis was performed on the intake manifold device using the nozzle. Based on the analysis results, the experiment was performed at the best nozzle angle in order to confirm whether the application of the nozzle affects the exhaust gas of the automobile engine, the exhaust gas discharged from the engine was confirmed by changing the engine speed in the no-load engine simulation system. After that, we measured the engine power according to the application of the nozzle at the chassis dynamometer with the gasoline vehicle of driven mileages 30,000 km and 180,000 km. Also, the effect of the nozzle was confirmed by measuring the exhaust gas emitted from the vehicle in the ASM2525 mode, which is an actual vehicle performance test mode. As the results, the maximum air velocity in the intake manifold using the nozzle was shown with decreasing tendency as the increasing nozzle angles (30°, 45°and 60°) at the engine rotating speed of 2000 rpm, 3000 rpm, 4000 rpm respectively. And the maximum air velocity in the intake manifold inside was shown at the nozzle angle of 30°. Also, the air velocity at nozzle diameter of 2.5 mm was shown higher than that of the nozzle diameter of 5 mm. From the analysis results, the exhaust gas performance test was performed in the engine simulator system based on the nozzle angle of 30 °, which maximizes the flow velocity of the air. As the nozzle inlet speed increased, the HC exhaust gas of nozzle diameters of 2.5 and 5 mm was decreased more than that of non-nozzle by 60.1% and 51.7%, respectively. In the engine with a driven mileage of 30,000 km. the CO exhaust gas of nozzle diameters of 2.5 and 5 mm was decreased that of non-nozzle by 51% and 41.5%, respectively. And the NOx exhaust gas was decreased that of non-nozzle by 81.4% and 69.3%, respectively. As the nozzle inlet speed increased, the HC exhaust gas of nozzle diameters of 2.5 and 5 mm was decreased that of non-nozzle by 60.3% and 35.6%, respectively, in the engine with a driven mileage of 180,000 km. And the CO exhaust gas was decreased that of non-nozzle by 49.6% and 35.6%, respectively. Also, the NOx exhaust gas of nozzle diameters of 2.5 and 5 mm was decreased more than that of non-nozzle by 21.3% and 30.3%, respectively in the engine with a driven mileage of 180,000 km. The application of the nozzle to the intake manifold reduced HC, CO, and NOx emissions caused by incomplete combustion in a no-load engine system. Accordingly, it was conducted experiments on engine output performance of 30,000 km and 180,000 km of vehicles. The engine output for nozzle diameters of 2.5 and 5 mm in a vehicle with a driven mileage of 30,000 km was improved by 6.5% and 4.7% respectively compared to the case without nozzle. The engine output for nozzle diameters of 2.5 and 5 mm in a vehicle with a driven mileage of 180,000 km was improved by 13.3% and 3.3%, respectively, compared to the case without nozzle. In order to confirm the influence of the exhaust gas of the vehicle applying the nozzle on the intake manifold under the engine load condition, exhaust gas was measured in the ASM2525 mode, which is a method of measuring the exhaust gas of a gasoline vehicle. The HC exhaust gas of nozzle diameters of 2.5 and 5 mm was decreased than that of non-nozzle by 45.8% and 39.3%, respectively, in the engine with a driven mileage of 30,000 km. And the CO exhaust gas was decreased that of non-nozzle by 47.8% and 34.8%, respectively. Also, the NOx exhaust gas of nozzle diameters of 2.5 and 5 mm was decreased than that of non-nozzle by 71.9% and 53.8%, respectively, in the engine with a driven mileage of 30,000 km. The HC exhaust gas of nozzle diameters of 2.5 and 5 mm was decreased than that of non-nozzle by 50.8% and 38.4%, respectively, in the engine with a driven mileage of 180,000 km. And the CO exhaust gas was decreased that of non-nozzle by 56.9% and 43.1%, respectively. Also, the NOx exhaust gas of nozzle diameters of 2.5 and 5 mm was decreased than that of non-nozzle by 34.4% and 27.1%, respectively, in the engine with a driven mileage of 180,000 km. It was confirmed that the application of the nozzle improves the output of the engine and drastically reduces harmful exhaust gases HC, CO, and NOx.