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분사각 및 분공 직경이 예혼합 압축착화 엔진 연소에 미치는 영향
국상훈,공장식,박세익,배충식,김장헌,Kook, Sang-Hoon,Kong, Jang-Sik,Park, Se-Ik,Bae, Choong-Sik,Kim, Jang-Heon 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.2
The effect of injector geometries including the injection angle and number of nozzle holes on homogeneous charge compression ignition (HCCI) engine combustion has been investigated in an automotive-size single-cylinder diesel engine. The HCCI engine has advantages of simultaneous reduction of PM and NOx emissions by achieving the spatially homogenous distribution of diesel fuel and air mixture, which results in no fuel-rich zones and low combustion temperature. To make homogeneous mixture in a direct-injection diesel engine, the fuel is injected at early timing. The early injection guarantees long ignition delay period resulting in long mixing period to form a homogeneous mixture. The wall-impingement of the diesel spray is a serious problem in this type of application. The impingement occurs due to the low in-cylinder density and temperature as the spray penetrates too deep into the combustion chamber. A hole-type injector (5 holes) with smaller angle ($100^{\circ}$) than the conventional one ($150^{\circ}$) was applied to resolve this problem. The multi-hole injector (14 holes) was also tested to maximize the atomization of diesel fuel. The macroscopic spray structure was visualized in a spray chamber, and the spray penetration was analyzed. Moreover, the effect of injector geometries on the power output and exhaust gases was tested in a single-cylinder diesel engine. Results showed that the small injection angle minimizes the wall-impingement of diesel fuel that results in high power output and low PM emission. The multi-hole injector could not decrease the spray penetration at low in-cylinder pressure and temperature, but still showed the advantages in atomization and premixing.
전력설비용 가교 Polyethlene의 Glass 전이점에서의 전기전도특성에 관한 연구
김강원(Kang-Won Kim),서장수(Jang-soo Seo),김병인(Byoung-In Kim),국상훈(Sang-Hoon Kook) 한국조명·전기설비학회 1991 한국조명·전기설비학회 학술대회논문집 Vol.1991 No.-
It happened that there was a sudden peak with the capacity of change, when I measured the capacity of change, cubical expansion and Thermally Stimulated Current on the Cross-linked Polyethylene. Crystal melting began at 375K and changed into formaless shapeless at 380K. The conduct of a particle on the surfase of dipole, electron trap was founded to be ion conduction nature under the low electronic field, wherase, the electron nature under the high electronic field. Consequently, under the semi-conduction layer electronic a particle was injected interface and accumulated for a time and appeared to be TSC.