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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.
서현규(Hyun Kyu Suh),박성욱(Sung Wook Park),권상일(Sang Il Kwon),이창식(Chang Sik Lee) 한국자동차공학회 2004 한국 자동차공학회논문집 Vol.12 No.6
This work was conducted to figure out the atomization characteristics of three types of bio-diesel fuels using a common-rail injection system. The process of spray development was visualized by using a spray visualization system composed of a Nd:Y AG laser and an ICCD camera. The spray tip penetrations were analyzed based on the frozen images from the spray visualization system. On the other hand, the microscopic atomization characteristics such as the distributions of SMD and axial mean velocity were measured by using a phase Doppler particle analyzer system.<br/> It is revealed that the sprays of the bio-diesel fuels have larger SMD than that of diesel fuel mainly due to high viscosity of bio-diesel. Different characteristics of bio-diesel fuels were also measured in spray tip penetrations according to the fuels and mixing ration.
서현규(Hyun Kyu Suh) 한국자동차공학회 2014 한국 자동차공학회논문집 Vol.22 No.1
In this work, the mixture formation and atomization characteristics of biodiesel fuel were reviewed under various test conditions for the optimization of compression-ignition engine fueled with biodiesel. To achieve these, the 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 promoted the atomization performance of biodiesel. The group-hole nozzle geometry and split injection strategies couldnt improve it, however, the different orifice angles which were diverged and converged angle of a group-hole nozzle enhanced the biodiesel atomization. It was also observed that the increase of fuel temperature induced the quick evaporation of biodiesel fuel droplet.
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.
알케인계 연료 물성치에 따른 단일 연료 액적의 Soot 생성 특성
서현규 ( Hyun Kyu Suh ),임영찬 ( Young Chan Lim ),장성오 ( Sung Oh Jang ) 한국액체미립화학회 2016 한국액체미립화학회 학술강연회 논문집 Vol.2016 No.-
The soot formation characteristics of single fuel droplet in accordance with various alkane fuel properties were studied in this work under the identical experimental conditions. The experimental conditions were set to 1.0atm of ambient pressure(P<sub>amb</sub>), 21% of oxygen concentration(O<sub>2</sub>) and 79% of nitrogen concentration(N<sub>2</sub>). Combustion and soot formation of single fuel droplet was visualized by high speed camera and visualization system. At the same time, ambient pressure(P<sub>amb</sub>), oxygen concentration(O<sub>2</sub>) and nitrogen concentration(N<sub>2</sub>) were maintained by ambient condition control system. Soot formation characteristics was analyzed and compared on the basis of intensity ratio(I/I<sub>0</sub>) of background image. The results of toluene fuel droplet combustion showed the largest soot generation. Soot volume fraction(f<sub>v</sub>) was almost the same under the identical fuel types regardless of various initial droplet diameter since thermophoretic flux was not much changed under the same ambient conditions.
노즐 형상에 따른 디젤 연료 분무 도달거리 예측에 관한 수치해석적 검증
서현규 ( Hyun Kyu Suh ),민세훈 ( Se Hun Min ) 한국액체미립화학회 2016 한국액체미립화학회 학술강연회 논문집 Vol.2016 No.-
The objective of this study was to verify the experimental and numerical results of spray tip penetration injected from different types of the nozzle-hole geometries. Spray visualization was taken by high speed camera under the different test conditions. For the simulations of spray evolution, turbulence, evaporation and breakup model were applied K-zeta-f, Dukowicz and Wave model, respectively. The prediction accuracy of spray tip penetration was increased by the varying of the spray cone angle. At the same time, the results of this work were compared in terms of spray tip penetration, and SMD characteristics. The numerical results of spray evolution process and spray tip penetration showed good agreement with experimental one.
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.