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Das, Shubhra Kanti,Kim, Kihyun,Lim, Ocktaeck Elsevier 2018 Fuel processing technology Vol.178 No.-
<P><B>Abstract</B></P> <P>Detailed investigation of the spray phenomenology of liquid fuel injection is the primary step to understand better and predict the physical characteristics involved in fuel spray and atomization process. This study focuses on non-vaporizing transient spray characteristics of neat gasoline and biodiesel addition (10%, 20% and 40% by volume) to gasoline in three different ratios under low load and different injection pressure conditions. Different ambient gas densities and injection pressures were tested, which ranged from 10 to 20 kg/m<SUP>3</SUP> and 40 to 120 MPa respectively, with a fuel temperature of 323 K. A z-type shadowgraph was utilized as an optical method to capture the highly transient spray development at 40000 frames per second and a modified image processing algorithm was implemented to determine the spray characteristics. The image processing results revealed that an increase in injection pressure significantly accelerates the spray development process while penetration length increases with the increment of biodiesel fraction. Differences in penetration lengths were much significant under lower injection pressure; however, a further increase in injection pressure diminishes the differences in tip penetration. The spray cone angle was increased for higher gasoline content which promotes a larger spray width and as a consequence, neat gasoline exhibited a larger spray area and volume. However, after a certain period of injection start, spray area and volume of neat gasoline and 10% biodiesel-blended gasoline were surpassed by 20% and 40% biodiesel-blended gasoline. In contrast, a decrease in droplet size was observed according to breakup regimes under high injection pressure and low ambient density. These results imply that the higher biodiesel blending fraction has poor air-fuel mixing capability compared to neat gasoline, and the risk of liquid impingement on the cylinder wall becomes higher if the blended-gasoline contains higher biodiesel percentage.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Macroscopic spray characteristics were investigated at non-vaporizing condition. </LI> <LI> Results are compared for neat gasoline and gasoline blended with biodiesel. </LI> <LI> Influences of low load, injection pressure and fuel blend ratios are demonstrated. </LI> <LI> ECN schilerien image processing code was extended for laser-based shadowgraph. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
A Comprehensive Study on Fuel Injector Test Bench for Heavy Duty Engine
Das, Shubhra Kanti,Thongchai, Sakda,Lim, Ocktaeck Institute for Liquid Atomization and Spray Systems 2015 한국액체미립화학회지 Vol.20 No.3
This study discusses a fuel injector test bench containing a mechanical type fuel supply system for heavy duty diesel engine. The main focus of this study was to evaluate the design stability of the test bench, which basically measures the injector durability of a multi-hole heavy duty injector by using pure diesel as a test fuel. In this experiment, diesel spray was controlled by a specially designed control box and all the experiments were carried out to measure e.g. fuel injection pressure and fuel injection quantity to understand the injection status which is interlinked with the stability factor of total test bench design. Also, the durability test was performed to understand the heavy duty operation lastingness of the designed system and the flow rate of the installed distributor pump in the fuel supply system of this studying test bench was compared with LO-1 and LO-2 pump. The results of the above mention tests revealed that the injector test bench design and control system can serve the purpose for heavy duty injector.
( Shubhra Kanti Das ),( Kim Hyojin ),( Ocktaeck Lim ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
Experiments were performed to determine the spray and ignition characteristics of gasoline-biodiesel blended fuel using a constant volume combustion chamber (CVCC). The main objective of this study is to reveal the effects of biodiesel addition to gasoline under 5%, 10%, 20% and 40% by volume and their applicability in the future compression ignition. Non-vaporizing spray and combustion characteristics were investigated under varying injection pressure (40-120 MPa) and ambient gas density (10-20 kg/㎥) conditions using neat gasoline and gasoline biodiesel fuel blends. The results of the experiments were combined to identify spray and ignition characteristics of each fuel under same operating condition. Non-vaporizing spray characteristics results (e.g. spray penetration, spray cone angle, spray area) provides a quantitative profile of the spray structure. On the other hand, spray combustion characteristics were determined (e.g. rate of heat release, ignition delay) under different oxygen concentration ranging from 10% to 21%. From non-vaporizing spray characteristics, it can conclude that the increase in ambient gas density decreases the vapor penetration, spray area but increases the spray angle. From the spray combustion result, it is obvious that higher biodiesel fraction leads the shorter auto-ignition delay which reduces the requirement of intake temperature.
A Comprehensive Study on Fuel Injector Test Bench for Heavy Duty Engine
( Shubhra Kanti Das ),( Sakda Thongchai ),임옥택 ( Ocktaeck Lim ) 한국액체미립화학회 2015 한국액체미립화학회지 Vol.20 No.3
This study discusses a fuel injector test bench containing a mechanical type fuel supply system for heavy duty diesel engine. The main focus of this study was to evaluate the design stability of the test bench, which basically measures the injector durability of a multi-hole heavy duty injector by using pure diesel as a test fuel. In this experiment, diesel spray was controlled by a specially designed control box and all the experiments were carried out to measure e.g. fuel injection pressure and fuel injection quantity to understand the injection status which is interlinked with the stability factor of total test bench design. Also, the durability test was performed to understand the heavy duty operation lastingness of the designed system and the flow rate of the installed distributor pump in the fuel supply system of this studying test bench was compared with LO-1 and LO-2 pump. The results of the above mention tests revealed that the injector test bench design and control system can serve the purpose for heavy duty injector.