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이 논문의 연구 히스토리 (2)

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The effect of multi-hole injector, EGR and pilot injection is studied on the purpose of reducing the particulate matter (PM) and nitrogen oxides (NOx) emissions in a high speed direct-injection (HSDI) diesel engine. Multi-hole infector could lead faster atomization and vaporization due to the small hole-diameter. It increased the portion of the premixed combustion, which results in low PM emission.
Adversely, NOx emission increases due to the rise of the combustion temperature with enhancement of the air-fuel mixing EGR could be applied to resolve this problem. In addition pilot injection could compensate power output and assist NOx reduction. The main objective of this study is to investigate the effects of the combined use of EGR and optimized pilot injections with multi-hole injector on combustion and emissions. The study was carried out in a single-cylinder optical direct-injection (DI) diesel engine equipped with a high pressure common-rail fuel injection system. Tests were performed at fixed engine speed (800rpm) with variations of the EGR rate and the injection pressure.
Two different injectors with 5 and 14 holes were tested. EGR rate was applied from 0% to 50%, and pilot injection test was performed under the same condition. The experimental results showed that 14-hole injector achieved better combustion performance, while it increased NOx emission at 60 MPa injection pressure. EGR reduced NOx emission by 80~90% without a significant increase in PM emission. The reduction of flame luminosity through the visualized combustion explained these phenomena. The optimized use of multi-hole injector, EGR and pilot injection showed the improved power output and the reduced NOx and PM emissions.

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Abstract

1.서론

2.실험 장치 및 실험 조건

3.실험 결과

4.결론

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UCI(KEPA) : I410-ECN-0101-2009-556-014331953