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Two-Dimensional Imaging of Ignition Processes in a Transient Fuel Spray
Hidenori, Kosaka,Takeyuki, Kamimoto 경상대학교 공과대학 항공기계공학부 1999 WORKSHOP 자료집 Vol.1999 No.1
To investigate the ignition processes in a diesel spray, the to-dimensional techniques of silicone oil particle scattering imaging (SSI) and laser induced fluorescence (LIF) were used. The sequential and two-dimensional images of SSI reveal that the first ignition occurs in the periphery of spray head vortices, not in spray tip. The fluorescent images of intermediate products which arc formed during the ignition reaction were taken by the LIF method with the laser sheet of the of the 3rd harmonics of ND:YAG laser. We conducted these visualization techniques and measured the chamber pressure under the same conditions. Then the ignition delay obtained by each technique was compared. This comparison showed that both the time when the first local heat release is. detected by SSI method and the time when the first fluorescence is by LIF method are nearly equal to the time when the total heat release due to ignition reaction exceeds the heat absorption of fuel evaporated.
Two-Dimensional Imaging of Early Stage of Soot Formation in Diesel Spray Flame by LIF technique
Hidenori Kosaka,Tetsuya Aizawa,Yukio Matsui 한국자동차공학회 2001 한국자동차공학회 Symposium Vol.- No.-
To investigate the structure of reaction zone and the early process of young soot formation in a diesel spray flame, CH radical and polycyclic aromatic hydrocarbons formed in a flame were visualized two-dimensionally and simultaneously, CH radical was used as the indicator of reaction zone in a flame because CH is produced and destroyed in fuel decomposition zone and exists in thin layer near the stoichiometric contour in a flame, For the visualization of early soot formation zone in a flame, the polycyclic aromatic hydrocarbons (PAH) were used as tracers in LIF technique, PHA are well known as the precursors of young soot.<br/> A Nd:Y AG pumped dye laser was used as a light source. The wavelength of incident light was tuned to 390.58 nm to excite CH with the 01(8.5) transition of B²Σ-X²Ⅱ v '=0, v "=0) band. The sheet of light passed through the mid-plane of the flame and the LIF from the species in a flame were imaged by an ICCD camera. A narrow band optical filter with a central wavelength of 430 nm and a FWHM of 10 nm was used to detect the fluorescence from CH with the transition of A²Σ -X²Ⅱ (v '=0, v "=0) band. The LIF spectrum of PAH formed in a flame was detected by a spectrometer at excitation wavelengths of 266 nm, 355 nm and 390 nm. These spectrum were analyzed for identification of P AH formed in a flame.<br/> In preliminary experiments, CH and PAH formed in a diffusion burner flame were visualized two-dimensionally. Methane and propane were used as fuel. In the LIF images of gas jet diffusion flames, LIF of CH can be observed as the very thin layers with the width of less than 1 mm located in the flame periphery. In the central region surrounded by CH thin layer, the strong LIF from PAH can be seen. The LIF from central region of the jet has broad spectrum whose peak is at 440 nm.<br/>
이경석,Hidenori Kosaka,Susumu Sato,Toshiyuki Yokoi,최병철,김대석 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-
The objective of this study is to investigate the catalytic performance of Cu-zeolite catalysts supported on various types of zeolites (chabazite, MFI, and BEA) for selective catalytic reduction with C3H6. 2Cu/ZSM-5 exhibited a nearly 70% de-NOx performance at 360 °C, Cu/SSZ-13 and Cu/BETA exhibited less than 60%. The loading of Cu also exhibited different de-NOx performances, which were related to the chemical states of Cu. The isolated Cu2+ ion was favorable to the NOx reduction compared to the bulk CuOx species. The effects of O2, CO2 concentrations and hydrothermal aging were investigated for the 2Cu/ZSM-5 catalyst.
Lee, Kyungseok,Kosaka, Hidenori,Sato, Susumu,Yokoi, Toshiyuki,Choi, Byungchul,Kim, Daesuk Elsevier 2019 Journal of industrial and engineering chemistry Vol.72 No.-
<P><B>Abstract</B></P> <P>The objective of this study is to investigate the catalytic performance of Cu-zeolite catalysts supported on various types of zeolites (chabazite, MFI, and BEA) for selective catalytic reduction with C<SUB>3</SUB>H<SUB>6</SUB>. 2Cu/ZSM-5 exhibited a nearly 70% de-NOx performance at 360°C, Cu/SSZ-13 and Cu/BETA exhibited less than 60%. The loading of Cu also exhibited different de-NOx performances, which were related to the chemical states of Cu. The isolated Cu<SUP>2+</SUP> ion was favorable to the NOx reduction compared to the bulk CuOx species. The effects of O<SUB>2</SUB>, CO<SUB>2</SUB> concentrations and hydrothermal aging were investigated for the 2Cu/ZSM-5 catalyst.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Various amounts of Cu were impregnated into SSZ-13, ZSM-5 and BETA zeolite. </LI> <LI> 2Cu/ZSM-5 exhibited the highest NOx conversion. </LI> <LI> O<SUB>2</SUB> significantly affected temperature window of NOx reduction for C<SUB>3</SUB>H<SUB>6</SUB>-SCR. </LI> <LI> CO<SUB>2</SUB> negatively impacted on NOx conversion and partial oxidation of C<SUB>3</SUB>H<SUB>6</SUB>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
WEAR AND DEFORMATION OF NOZZLE BODY SEAT OF DIESEL FUEL INJECTOR
Athiwat Butmarasri,Susumu Sato,Hidenori Kosaka 한국자동차공학회 2022 International journal of automotive technology Vol.23 No.1
Wear and deformation occur in the body seat of diesel fuel injector nozzles, thereby affecting fuel spray behaviors and injection characteristics. In this study, the effects of body seat temperature, test duration, temperature increase duration, tempering temperature, and tempering duration on the nozzle body seat are investigated using an injector testing device. Surface roughness measurements using a nano search microscope and hardness measurements of the nozzle body seat are performed to investigate the textural and physical characteristics of the nozzle body seat. In addition, optical measurements via optical microscopy and field emission scanning electron microscopy are performed to investigate the topographical information and microstructure of the nozzle body seat. The results show that the increase in wear and deformation is related to the higher test temperature and duration. Additionally, the tempering technique can suppress the deformation of the nozzle body seat.
Pop-Paul Ewphun,Chau Tan Vo,Prathan Srichai,Chinda Charoenphonphanich,Susumu Sato,Hidenori Kosaka 한국자동차공학회 2017 International journal of automotive technology Vol.18 No.4
This paper investigates the effects of Hydrotreated vegetable oil-diesel blend to combustion characteristics under various ambient oxygen concentrations and ambient pressure. Combustion characteristics were investigated using heat release rate analysis, two color method, soot concentration measurement and NOx concentration measurement. The experiments were carried out on a rapid compression expansion machine to simulate the ambient condition of a CI engine at TDC. Synthetic gas with oxygen concentrations of 21 %, 15 % and 10 % were used to simulate EGR conditions. A single hole injector was used with five different fuels: commercial diesel, HVO-commercial diesel blends and HVO. The results showed that increasing HVO blending percentages decreased ignition delay, flame temperature, soot concentration and NOx concentration. Heat release at oxygen concentration of 10 % dramatically dropped due to a shortened ignition delay, which resulted in less combustion. A decreased oxygen concentration from applied EGR conditions not only increased ignition delay, heat release, flame temperature and NOx concentration, but also increased soot concentration. A combination of EGR and supercharged conditions by increasing ambient pressure and decreasing oxygen concentrations resulted in increased heat release, decreased flame temperature, ignition delay and soot concentration, compared to EGR conditions.
Vo Tan Chau,Charoenphonphanich Chinda,Karin Preechar,Susumu Sato,Hidenori Kosaka 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.9
Soot and NO x emissions are the inherent combustion characteristics of diesel engines. The modification of fuel property makes for an interesting study of methods for elimination of soot and NO x emissions. HVO and blends of 20 %, 50 %, 80 % by mass of HVO with commercial diesel fuel (mixed 7 % FAME), in combination with various EGR conditions were carried out to evaluate soot and NO xformation, as well as combustion characteristics of HVO blends in RCEM. The obtained results revealed that ignition delay, flame temperature, NO x and soot concentration decreased as HVO percentage increased. Mixing ratios of HVO with diesel showed a similar flame profile at baseline condition, higher flame temperature and darker soot density-KL regions were distributed on the upstream of spray flame. HVO displayed a slightly lower in-flame temperature and KL density, which led to a decrease of 33 % and 15.9 % of NO x and soot concentration, respectively, compared to diesel. By applying higher EGR levels, a reduction of heat release rate, flame temperature and NO x emissions were recorded. Also observed was an increase in ignition delay and soot concentration. Notably, soot at 10 % O 2concentration was lower than that of 15 % O 2 concentration.