• 수산해양기술연구
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• 제46권4호
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• pp.487-494
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• 2010

In order to test the applicability of bunker-A in a diesel engine for small-fishing boat, the investigation of the engine performance and the exhaust emission was performed under various conditions of fuel property, intake air pressure and fuel temperature. It was also performed based on IMO NOx Technical code. At high load, the energy consumption rate of bunker-A was lower than that of diesel oil, and the characteristics of exhaust emission of bunker-A were similar to those, and NOx emission rates of both fuels satisfied the IMO NOx emission regulation limits. The energy consumption rate and characteristics of exhaust emission were improved as the intake air pressure was increased, but these were not improved remarkably as the temperature of bunker-A was heated. However, at low load the energy consumption rate, CO emission rate and HC emission rate of bunker-A were higher than those of diesel oil, but NOx emission rates of the fuels were about the same. In addition, at low load the energy consumption rate and CO emission rate of bunker-A were increased as the intake air pressure and the temperature were higher than normal conditions. Accordingly, it is thought that the use of bunker-A in a kind of test engine is possible at high load. On the other hand, it is thought that more research is needed to improve the combustion efficiency under low temperature and low load condition.

• 한국자동차공학회논문집
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• 제2권3호
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• pp.85-93
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• 1994

The engine performance and combustion characteristics of diesel oil and fish oil blended with diesel oils were investigated at various blending rate of fish oil in a diesel engine. The maximum pressure showed no significant difference among test fuels at low load, but it was higher as the blending rate of fish oil increases at high load. Increasing the blending rate of fish oil, the rate of heat release and burned fraction were higher than those of diesel oil. The ignition delay became longer than that of diesel oil as the blending rate of fish oil increases, and its differences were larger at different loads. The combustion duration and density of smoke were shorter and lower as the blending rate of fish oil increases. The rate of fuel consumption showed no significant difference between diesel oil and fish blended with diesel oils.

• 한국생산제조학회지
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• 제20권5호
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• pp.673-678
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• 2011

For the wind-diesel hybrid electric power generation system equiped with two diesel generators, the diesel power sharing is studied analytically and a power sharing technique of less fuel consumption is developed. Based on the technique, as example, a diesel power sharing algorithm is suggested for two diesel generators of capacity 500Kw(200Kw+300Kw).

• 수산해양기술연구
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• 제20권2호
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• pp.127-132
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• 1984

(1) 디이젤기관용 대체연료로서 혼합유가 디이젤유의 연료에 대한 특성을 검토하였다. (2) 혼합유로서 디이젤기관을 운전할 경우 배기가스량은 디이젤유보다 평균 8% 정도 많음을 나타내었다. (3) 혼합유로서 디이젤기관을 운전할 경우 디이젤유에 비하여 연료소비량이 약 3% 정도 증가하였다. (4) 정미열효율에 있어서는 디이젤유와 혼합유는 거의 비슷한 상태를 나타내었다.

• 수산해양기술연구
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• 제32권2호
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• pp.148-156
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• 1996

The combustion characteristics of diesel oil and fish oil blended with diesel oils were investigated at various blending rate of fish oil in diesel engine and constant volume combustion bomb. The evaporation and combustion duration of diesel oil and fish oil blended with diesel oils were respectively different high and low temperature. The dependence of ignition delay on the temperature was different in high and low temperature ranges which were divided at the 773K. The ignition delay become longer than that of diesel oil as the blending rate of fish oil increases, and its difference were larger at different loads. The densityof smoke was lower as the blending rate of fish oil increases, and the rate offuel consumption showed no significant difference between diesel oil and fish oil blended with diesel oils.

• 한국자동차공학회논문집
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• 제1권2호
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• pp.34-41
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• 1993

In order to reduce harmful substances such as particulates and nitric oxides emitted from diesel engine, man kinds of methodology like high pressure spray of diesel fuel oil, exhaust gas recirculation, emulsified fuel usage and dual fuelling have been studied. Dual fuelling of a diesel engine with hydrogen which is well-known as the clean fuel and has excellent combustibility is expected to be effective in reducing harmful substances from diesel engine. This experimental study was conducted to investigate the effect of premixed hydrogen with intake air on the performance and particulate emission characteristics using a single cylinder, prechamber type diesel engine. As a result, it was clarified that a hydrogen-premixed diesel engine can be operated in the state of lower particulate emission and slightly aggravated fuel economy, compared with the conventional diesel engine.

• 한국소음진동공학회논문집
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• 제11권9호
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• pp.398-405
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• 2001

The maximum and mean indicated pressure of two stroke low speed diesel engine has been continuously increased with a view of increasing engine power and also reducing fuel consumption. As a result, axial excitation has been increased comparing to that of the previous one. So the axial vibration damper in standard one is applied to all two stroke low speed diesel engine at the free end of crankshaft. Though many studies were carried out for marine use, few has been made for diesel power plant because there was little demand for power plant. Nowadays, diesel engine is much to be used for many benefits. In this paper, the optimum design of axial vibration on the 65 kW diesel power plant with tow 9K80MC-S engines of 9 cylinders was carried out. And the axial-torsional coupled vibration of this shafting system is identified by theoretical analysis and vibration measurement.

• Journal of Mechanical Science and Technology
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• 제20권9호
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• pp.1436-1448
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• 2006

This paper describes the effects of injection rate shaping on the combustion, fuel consumption and emission of $NO_x$ and soot of a medium duty diesel engine. The focus is on the influence of four different injection rate shapes, square type 1, square type 2, boot and ramp, with a variation of maximum injection pressure and start of injection (SOI). The experiments were carried out on a 1 liter single cylinder research diesel engine equipped with an amplifier-piston common rail injection system, allowing the adjustment of the injection pressure during the injection event and thus injection rate as desired. Two strategies to maintain the injected fuel mass constant were followed. One where rate shaping is applied at constant injection duration with different peak injection pressure and one strategy where rate shaping is applied at a constant peak injection pressure, but with variable injection duration. Injection rate shaping was found to have a large effect on the premixed and diffusion combustion, a significant influence on $NO_x$ emissions and depending on the followed strategy, moderate or no influence on soot emission. Only small effects on indicated fuel consumption were found.

• 대한기계학회논문집B
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• 제28권12호
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• pp.1467-1474
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• 2004

Recently, with respect to an increase of energy consumption, many countries have tried to develop alternative fuels. In the United States, less than 10 percent of motor fuels will be displaced by alternative fuels by year 2010, with about 25 percent of the replacement fuels from renewable resources. But the level of exhaust gas is not decreased to the result of an increase of diesel vehicles. Moreover, emission regulations are being intensified by advanced countries such as America and Europe. Because Biodiesel is similar to diesel fuel, it is essential to judge the environmental and health effects deriving from the use of Biodiesel in diesel engine. Therefore, this research could be conformed whether both Biodiesel 20% and Biodiesel 100% are influenced on emission according to sulfur contents by applying DOC. As a result of using the Biodiesel, this research could be conformed though Nox was increased, CO, HC and PM were decreased, and also estimated to compare diesel fuel with the Biodiesel in accordance with engine performance and emission characteristics.

• 한국수소및신에너지학회논문집
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• 제34권1호
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• pp.69-76
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• 2023

An experimental study was conducted on a 4-stroke direct injection diesel engine to examine the combustion and emission characteristics of 1-octanol/diesel fuel blends. The concentration of 1-octanol in the fuel blends was 10%, 30%, and 50% by volume. Experiments were conducted by varying the engine torque from 6 Nm to 12 Nm at the same engine speed of 2,700 rpm. Results showed that the fuel conversion efficiency increased as the 1-octanol proportion increased under most experimental conditions. However, the brake specific fuel consumption increased due to the relatively low lower heating value of 1-octanol. The smoke opacity and the concentrations of NO_x and CO emissions generally decreased with brake mean effective pressure as the 1-octanol proportion increased. On the other hand, the unburned hydrocarbon concentration increased with an ascending ratio of 1-octanol.