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Boidiesel 혼합연료의 초음파 에너지 조사 시간에 따른 물리적ㆍ화학적 특성에 관한 실험 연구
임석연(Seokyeon Im),송용식(Yongsik Song),정영철(Youngchul Jung),최두석(Dooseuk Choi),류정인(Jeongin Ryu) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The purpose of this study is to understand the physical and chemical characteristics of Biodiesel blended fuel that is reformed by ultrasonic energy irradiation. To understand the characteristics, the mixing of commercial diesel fuel and biodiesel was compared and analyzed according to whether or not ultrasonic energy irradiationwas performed and also the duration of irradiation. The result of the experiments indicates that when ultrasonic energy irradiation was performed on biodiesel blended fuel, its viscosity decreased by 3~7%. In the case of BD20, when the ultrasonic energy irradiation was performed, its sauter mean diameter(SMD) dropped by 12% on average. As the irradiation time increased, the volume ratio of olefins increased up to a maximum 2.7%, and the Higher heating value increased to a maximum of 5.8%. On the contrary, the ratio of aromatics decreased by a maximum 2.7%, and BI decreased by a maximum of 7%.
연속분사노즐에서 W/O type 초음파 유화연료의 분무특성에 관한 연구
김용철(Yongcheol Kim),송용식(Yongsik Song),이병오(Byoungoh Lee),정주영(Jooyoung Jung),류정인(Jeongin Ryu) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To investigate spray of emulsified fuel of ultrasonic-energy-added W/O type, we mixed water with diesel oil by using ultrasonic energy fuel feeding system. We measured the SMD of sprayed droplet to find atomization characteristics of emulsified fuel by using the Malvern 2600 system. In addition, we measured the capacitance value to verify stability of same specimen by using the digital LCR meter, EDC1630. The main results are as follows; 1) The measuring distance increased between one hole nozzle tip and analyzer beam, the more increased SMD increased. 2) The more water content increased, the more capacitance value increased depending on the time. Main Parameters of the study are the amount of water content, 0~30% by 5% in emulsified fuel, and the measurement distance, 10~140㎜ by 10㎜ or 20㎜, between nozzle tip and analyzer beam.
이병오(Byoungoh Lee),송용식(Yongsik Song),김용철(Yongcheol Kim),류정인(Jeongin Ryu) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper describes the effects of the combustion characteristics as cylinder pressure, heat release rate, mass fraction burned, and combustion duration of ultrasonically reformed diesel fuels in the indirect injection diesel engine. From the study, following conclusive remarks can be made. 1) The maximum combustion chamber pressures were increased by a maximum of 3㎏/㎠ in case of ultrasonically reformed fuel in comparison with that in the conventional fuel. In case of the retard of fuel injection timing, the maximum combustion chamber pressures of the ultrasonically reformed fuel showed nearly the same those of the conventional fuel. 2) Considering mass fraction burned, under operating with 2,000rpm and load 75%, the combustions of ultrasonically reformed fuel started a little early and ended rather early more than those of conventional fuel. When the injection timing was delay, the combustions of ultrasonically reformed fuel started a little later and ended rather early more than those of conventional fuel. 3) Within all the operation condition ranges of this experimental test, the ultrasonically reformed fuel decreased the combustion duration by a maximum of 7% and the ultrasonically reformed fuel delayed decreased the combustion duration by a maximum of 10% in comparison with conventional fuel.
오정환(Jeong-Hwan Oh),김충기(Choong-Ki Kim),백승호(Seung Ho Baek),신경순(Kyungsoon Shin),송용식(Yongsik Song) 한국해양환경·에너지학회 2011 한국해양환경·에너지학회 학술대회논문집 Vol.2011 No.11
선박평형수에 의해 유입된 다양한 수중생물들은 새로운 환경에 잘 적응하지 못하고 대부분 사멸하지만, 배출지역의 환경조건에 적응하여 살아남은 일부 종은 강한 생존력과 번식력으로 고유생태계를 교란 시킬 수 있다. 선박평형수에 포함된 외래생물종들의 잠재된 위험성 때문에, 선박평형수로 이동되어 다른 해역에 배출된 미세조류 또는 유해생물들이 배출 초기 주변수의 환경조건 (수온, 염분, 영양염 조건)에 성공적으로 정착할 수 있는지를 파악하는 것은 선박평형수 관리에 있어 매우 중요하다. 본 연구에서는 수역학수질모델(HEM-3D)을 이용하여 물리적 환경조건(예: 빛, 온도, 및 염분)에서의 외래 생물 종들의 성장을 모의하였다. 수치모델 결과는 배양실험결과에서와 마찬가지로 특정 수온 및 염분 조건에서 외래생물종이 재성장함을 보였다. Most phytoplankton species introduced by ship’s ballast water discharge tend to be extinct, but some species have ability to survive in sites for ballast water discharge and potential to disturb the native ecosystem. For a successful ballast water management, therefore, it is necessary to know if the invasive species introduced by ballast water can survive and regrow under the environmental conditions of surrounding water column. In this study, we simulated survivability of phytoplankton species introduced by ballast water discharge as a function of environmental conditions (i.e., light, water temperature, and salinity) using Hydrodynamic Eutrophication Model-3D (HEM-3D). The model results showed that some species were able to survive and regrow under specific ranges of water temperature and salinity, which is consistent with the results of laboratory experiments.