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- 저자 : 서현규(Hyun Kyu Suh) (검색결과 104 건)
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Dimethyl Ether(DME) 연료의 분무 거동 및 미립화 특성
서현규,박지홍,이창식,Suh, Hyun-Kyu,Park, Ji-Hong,Lee, Chang-Sik 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.5
Dimethyl Ether(DME) is an alternative fuel for diesel engine, it is renewable and offers potential reductions in emissions. This work was conducted to figure out the macroscopic behavior and the atomization characteristics of DME using a common-rail injection system. The macroscopic behavior was visualized with the spray visualization system composed of a Nd;YAG laser and an ICCD camera. The atomization characteristics were investigated in terms of axial mean velocity, Sauter mean diameter(SMD) and droplet distributions obtained from a phase Doppler particle analyzer(PDPA) system. In this study, it was revealed that the macroscopic behavior and the atomization characteristics of DME are similar compared with commercial diesel fuel. However, DME fuel has a shorter spray tip penetration and a small SMD due to the effect of evaporation characteristics.
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초기 직경이 n-heptane 액적 연소 특성에 미치는 영향
서현규 ( Hyun Kyu Suh ) 한국분무공학회 2013 한국분무공학회지 Vol.18 No.2
The spherically-symmetric burning of an isolated droplet is a dynamic problem that involves the coupling of chemical reactions and multi-phase flow with phase change. For the improved understanding of these phenomena, this paper presents the numerical results on the n-heptane droplet combustion conducted at a 1 atm ambient pressure in three different initial droplet diameter(d0). The main purpose of this study is to provide basic information of droplet burning, extinction and flame behavior of n-heptane and improve the ability of theoretical prediction of these phenomena. To achieve these, the numerical analysis was conducted in terms of normalized droplet diameter(d/d0), flame diameter(dr) and flame standoff ratio (FSR) under the assumptions that the droplet combustion can be described by both the quasi-steady behavior for region between the droplet surface and flame interface and the transient behavior for the region between the flame interface and ambient surrounding.
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피에조 인젝터의 연료 분사 특성 및 분무 거동에 관한 연구
서현규(Hyun Kyu Suh),박성욱(Sung Wook Park),김재욱(Jae Wook Kim),이창식(Chang Sik Lee) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study was conducted to figure out the injection characteristic and spray behavior injected by a piezo-driven injector and to compare with a solenoid-driven injector in common-rail injection system. The test conditions and design parameters piezo and solenoid driven injector have the same nozzles in a shape and number. The process of spray injection was visualized by using the spray visualization system composed of a Nd:YAG laser and an ICCD camera. To investigate the injection characteristics such as injection profile and injection delay, the injection rate was measured by using an injection rate meter. Compared with solenoid-driven injector, the piezo-driven injector has short injection delay and reach quickly to the maximum injection value. Spray tip penetration makes little difference, however, spray angle of piezo-driven injector is larger than that of solenoid-driven injector.
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서현규 ( Hyun Kyu Suh ) 한국분무공학회 2014 한국분무공학회지 Vol.19 No.3
The main purpose of this study is to provide basic information of droplet burning, extinction process and flame behavior of methanol fuel and improve the ability of theoretical prediction of these phenomena. For the improved understanding of these phenomena, this paper presents the experimental results on the methanol droplet combustion conducted under various initial droplet diameters (d0), ambient pressure (Pamb), and oxygen concentration (O2) conditions. To achieve this, the experimental study was conducted in terms of burning rate (K) with normalized droplet diameter (d/d0), flame diameter (df) and flame standoff ratio (FSR) under the assumptions that the droplet combustion can be described by both the quasi-steady behavior for the region between the droplet surface and the flame interface and the transient behavior for the region between the flame interface and ambient surrounding.
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함산소 바이오디젤 연료의 혼합기 형성 및 미립화 증진에 관한 연구
서현규(Hyun Kyu Suh),박성욱(Sung Wook Park),이창식(Chang Sik Lee) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
In this work, the improvement of mixture formation and atomization characteristics of biodiesel fuel were analyzed under various test conditions for the optimization of compression-ignition engine fueled with biodiesel. To achieve these, effect of nozzle caviting flow, group-hole nozzle geometry and injection strategies on the injection rate, spray evolution and atomization characteristics of biodiesel were studied by using spray characteristics measuring system. At the same time, the fuel heating system was installed to obtain the effect of fuel temperature on the biodiesel fuel atomization. It was revealed that cavitation in the nozzle orifice promotes the atomization performance of biodiesel. The group-hole nozzle geometry and split injection strategies can not improve it, however, the different orifice angles which is diverged and converged angle in a group-hole nozzle enhance the biodiesel atomization. It was also observed that the increase of fuel temperature induces the quick evaporation of biodiesel fuel droplet.
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