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디젤기관의 경유-메탄올 혼합유 사용에 관한 실험적 조사
왕우경,서정주 여수대학교 2001 論文集 Vol.16 No.-
The combustion and performance of diesel engines fueled with alcohol-diesel oil have been investigated because of its potential for low NOx and particulates emissions. One of the problems encountered in the use of alcohol-diesel oil blended fuel is the phase separation between two fuels. In this study, diesel oil and methanol were mixed compulsorily in preventing phase separation with installing agitators and a fuel oil boost pump on fuel oil line of test engine. The effects of diesel oil-methanol blended fuel on combustion characteristics and engine performance were investigated under various loads and blending ratio. The results showed that the engine performance and combustion characteristics were influenced by methanol blending ratio and variation of load. Especially, the result of 30% methanol blended fuel was different from those of other test fuels.
저층 트롤선의 예망 시 기관출력에 영향을 미치는 저항들에 관한 고찰
왕우경 한국수산해양기술학회 2023 수산해양기술연구 Vol.59 No.4
실제 해상에서는 바람, 조류, 파랑 등의 외력에 의한 부가저항이 수반되고 이들 부하에 따른 소요동력이 추가되며, 이들 부가저항의 크기는 거친 해상상태의 경우에는 정수 중 선체저항 값을 상회할 수 있다고 알려져 있다. 이들 바람과 조류의 영향은 특히 선박이 저속 항해 중일 때는 선박의 안전조종에 큰 영향을 미치게 된다. 이처럼 저층 트롤선도 예망 중에는 속력이 3~4 노트의 저속이므로 바람과 조류의 영향이 선박 조종에 큰 영향을 미친다고 생각되며, 이들에 의한 선속의 손실 및 동력 증가량을 파악할 수 있다면 주어진 기관 출력을 근거하여 안전한 예망력을 산출할 수 있으므로 적절한 어구의 규모를 결정할 수 있다. 본 연구에서는 추진기의 운전모드(constant and combined mode)에 따라 동일한 조사지역에서 계절별 해양조사를 위해 실시한 총 20회 정도의 트롤 조업과정 중에 수집한 항해자료, 트롤조업자료 및 기관자료를 기초하여, 선속, 선체저항, 어구의 저항 , 바람과 조류의 입사각에 대한 풍력 및 조류력 등을 구하고, 이들 부하에 대한 전체 소요동력을 산출하여 측정된 기관출력과 비교하였으며, 특히 풍력과 조류력이 기관출력에 미치는 영향들을 중점 조사하였다. In the actual sea, the additional resistance due to external force such as wind, current and wave is accompanied, and the required power is added in response to these resistance. Especially when the ship is sailing at low speed, the effects of wind and current have a great impact on the safe control of the ship. Likewise, it is thought that the effects of wind and current have a great impact on the trawl ship control since the towing speed of a bottom trawl ship is a low speed of 3 to 4 knots. If the reduce of ship speed and the increase of engine power due to the influence of wind and current can be identified, the safe towing power can be calculated based on a given engine output. Thus, the appropriate size of a fishing gear can be determined. In this study, a total of 20 trawl operations were conducted for seasonal maritime research in the same research area according to the operation mode of propeller. Based on navigation data, trawl fishing data, and engine performance data acquired during the towing fishing gear, and data of ship speed, hull resistance, fishing gear resistance, wind force and current force according to an incidence angle were estimated. The overall power for these loads was calculated and compared with the measured engine power, and the effects of wind force and current force on the engine power were investigated.
Trapping Purity 변화에 따른 압축행정중의 실린더 가스특성 평가
왕우경 麗水水産大學校産業技術硏究所 1998 産業基術硏究所 論文集 Vol.7 No.-
The purpose of this paper is to investigate the influence that gas composition at trapping affect ambient condition during compression process. Because, the ignition delay is strong dependent on gas temperature below about 1000K at the time of injection and the residual gas in cylinder influence performance and emission. In order to research, the purity, charge was assumed in range 80 to 100 percent. According to change of purity, gas properties were calculated with the first law thermodynamics and equation of state. Finally, temperature and pressure were evaluated in compression stroke. As a result of analytical calculation, it was found that gas temperature and pressure were decreased by decreasing purity.
분사율 형상에 따른 디젤기관의 연소해석에 관한 시뮬레이션
왕우경,서정주 여수대학교 2002 論文集 Vol.17 No.-
Diesel combustion is fundamentally controlled by the mixing process of fuel with air in the combustion chamber. The injection rate shape has an important role in controlling the turbulent mixing and combustion process. Because it is difficult to change the injection rate shape freely by a experimental apparatus, its effects have not been investigated yet. Therefore, Influences of the injection rate shapes on the spray behavior, combustion characteristics and engine performance were simulated based on a two-zone thermodynamic model. It was shown that the shape with a high injection rate in the first stage of the injection period improved the air entrainment and heat release. Also, the shape with a high injection rate in the middle of the injection period improved the engine performance.
왕우경,김옥삼 麗水水産大學校産業技術硏究所 1998 産業基術硏究所 論文集 Vol.7 No.-
In this study the Jominy end quench apparatus specified by Korean Industrial Standards was used to investigate the influence of the temperature of water and concentration of brine on hardness distribution of specimens. The results obtained are as follow ; 1. In carbon steel, at the end of specimen, variation of hardness was abruptly decreased. Above 10㎜ from the end surface hardness was decreased slightly. In Cr-Mo steel, hardness was decreased moderately. 2. 2% NaCl brine made little difference with city water in hardness distribution, 4~6% brine, hower, made a remarkable increase of hardenability. 3. Alloying elements such as Chromium and Molybdenum improve hardenability. Increase of carbon also contributes to the hardness. In alloy steel, the highest value of hardness depends on carbon content rather that Cr and Mo. The cooling rate affected on hardenability of caron steel more than that of alloying steel. 4. As the temperature of coolant increased the hardenability was decreased. This tendency was similar on alloy steel and carbon steel.