Abstract
Abstract: Since bio-diesel oil has a merit that it satisfies both demand of substitution for fossil fuel and reduction in carbon dioxide emission, it is widely used in diesel engines by blending in gas oil in small quantity. It is needed to reduce in NOx emission in some way or others if blending ratio of bio-diesel oil is going to increase, because it is demerit that bio-diesel oil emits more NOx emission than gas oil. In this study, it was accomplished to optimize 3 factors what effect on NOx emission as blending ratio of bio-diesel oil, injection timing and common rail pressure with an introduction of a design of experiments, in order to minimize a number of tests. It was cleared that to introduce the design of experiments was very available in NOx optimization. Key Words ：Bio-diesel Oil, NOx, Diesel Engine, Design of Experiments, Optimization ****†정석호(교신저자) : 부경대학교 기계시스템공학과E-mail : sukhojung@pknu.ac.kr, Tel : 051-629-6198 *이상득 : 한국해양대학교 실습운항원**김경현 : 부경대학교 탐양호***이한성 : 동주대학교 자동차·기계과****†Suk-Ho Jung(corresponding author) : Department of Mechanical System Engineering, PuKyong University.E-mail : sukhojung@pknu.ac.kr, Tel : 051-629-6198 *Sang-Deuk Lee : Sea training center **Kyong-Hyon Kim : TamYangHo, PuKyong University.***Han-Seong Lee : Department of Vehicle & Mechanical Engineering, DongJu University.
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