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물 혼합 연료를 사용한 디젤엔진의 EGR시스템에 의한 NO_x와 Soot의 배출특성 연구
박태인 慶尙大學校 工科大學 機械設計學科 1997 WORKSHOP 자료집 Vol.1997 No.1
Over the past years, many research works have been carried out to investigate the factors governing the performance of diesel, engine. The area of study has been focused on reducing NOx and soot, because there are many difficulties to reduce both at once in diesel engine. One of the efforts is developing EGR technology to reduce NOx emission. That is very effective on reducing NOx, but increases other emissions and makes economy worse. In order to solve the problem, EGR is employed with water emulsified fuel and tested in this experimental study. Emusified fuel is produced by centrifugal mixer and the amount of water is controlled by water injector and pulse generator. The results show that both NOx and smke emissions are reduced with a great degree simultaneously.
자동차 Heavy-Duty 디젤엔진의 배출가스 대책기술의 동향과 과제
김영길 慶尙大學校 工科大學 機械設計學科 1997 WORKSHOP 자료집 Vol.1997 No.1
This paper describes the Worldwide Trends on Exhaust Gas NO_x PM Control Technologies of Heavy Duty Diesel Engine, in shich involved engine modification technologies and after treatments. They are combustion improvements in related to injection timing retarding, etc. And finally we would like discuss on future problems to be solved.
원영호 慶尙大學校 工科大學 機械設計學科 1997 WORKSHOP 자료집 Vol.1997 No.1
Diesel combustion is very complex phenomena which is unsteady non-uniform, and two phase and which occurs in high temperature and pressure environment. Recently the laser sheet technique has been developed to improve our limited understanding of the in-cylinder diesel combustion. The technique is capable of high temporal and spatial resolution, so that it is proved to be an adequate combustion diagnostics to finding out diesel fuel mixture and exhaust emission formation. Some techniques -which are based on the different interaction between laser and particles have been developed especially for diesel combustion. Their principles and application to diesel combustion are reviewed in this paper. The measurement results are very helpful to extending our information about diesel combustion toward good combustion efficiency and low exhaust emissions.
열선 점화를 이용한 디젤 입자상 트랩의 자력 재생에 관한 수치적 시뮬레이션
박정규,정수훈 慶尙大學校 工科大學 機械設計學科 1997 WORKSHOP 자료집 Vol.1997 No.1
A mathematical model for self supporting regeneration of diesel particulate filter was developed here in order to describe the processes which take place in the filter after ignition by electric wire heating. The soot is ignited by heating wire at front part of the channel, the flame is propagated and the soot is burned through the channel. In the model, the heating by the electric wire was treated as uniform heat source. Various numerical tests were performed to demonstrate how regeneration factors affect regeneration process and obtain data which need to filter.
EGR시스템에 의한 디젤機關의 NO_x 및 煤煙 排出物 同時低減
裵明煥 慶尙大學校 工科大學 機械設計學科 1997 WORKSHOP 자료집 Vol.1997 No.1
The effects of exhaust gas recirculation(EGR) on the characteristics of Nox emissions and specific fuel consumption rate have been investigated using an eight-cylinder, four cycle, direct injection diesel engine operating at several loads and speeds. The theoreti-cal NO formation concentration is calculated with the equivalence ratio as a parameter of flame temperature to study the effect of EGR on NO_x emissions in the diesel combustion. The experiments in this study are conducted on the fixed fuel injection timing of 38 ' BTDC regardless of experimental conditions. It is found that the specific fuel consumption rate is slightly increased with EGR rate, and NO_x emissions are markedly reduced owing to the drop of the incoming oxygen concentration and the increase of equivalence ratio as the EGR rate increases.