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許柄武 群山大學校自然科學硏究所 1989 自然科學硏究 Vol.4 No.-
In this paper is theoretically examined on the performance calculation method of exhaust gas turbo charger. The effect of turbo charger are evaluated theoretically from measuring of amission ratio, excess air factor, specific fuel consumption, compressive ration and brake mean effect pressure. The brake mean pressure is increased with the decrement of excess air factor. Scavenging temperature and compressive index are very effect according to the increase and decrease of amission ratio. Specific fuel consumption is very developed to the amission ratio 1.3 and excess air factor 1.8 without the atmospheric temperature and scavenging temperature.
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小型 디이젤機關에 있어서 알코올利用에 관한 硏究 : 파이롯트 噴射法을 中心으로 On the Pilot Injection Method
許柄武 群山大學校自然科學硏究所 1988 自然科學硏究 Vol.3 No.-
The method of methanol using in diesel engines hasn't been established yet because of it's low ignition characters. In the recent year, many countries have been studing about substitude fuel in order to overcome oil crisis. The purpose of this study is to establish using method of alcohol, as a substitude fuel. The experiments have been under the these optimum injection time and pressure. In this study, combustion characters, engine performance and exhaust gas emissions are checked by using pilot injection method. Concluding remarks of these study are as follows. 1. The use of 5-10% diesel fuel makes steady operation and no smoke working condition of the engine. 2. If the auxiliary injection is done at the starting point of compression, the smoke and consumption rate are worse than the pilot injection. 3. The most optimum time of auxiliary injection is the pilot injection time such as BTDC 15°CA before main injection time.
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許柄武 群山大學校自然科學硏究所 1990 自然科學硏究 Vol.5 No.-
The purpose of this study is to examine the effects of many factors by increases combution efficiency in diesel engine. In this study, Engine performance is measured with variable injection pressure, BMEP and spray penetration. Concluding remarks of this study are as follows. 1. To calculate the precise rate of heat release, compensation of air column vibration and the method of least square were used. 2. The best BMEP and Injection pressure for the engine performance is at 0.5 Mpa and 12.7 Mpa. 3. while increasing fuel temperature, The spray penetration decreases considerably and the spray angle increases above the boiling temperature of Diesel engine. 4. With optimum fuel temperature for specific fuel consumption, smoke emission and CO is about 140℃.
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Diesel 機關에 있어서 熱發生率을 利用한 最適 噴射時期 및 壓力에 關한 實驗的 硏究
盧相舜,吳永澤,許柄武 全北大學校 1987 論文集 Vol.29 No.-
The purpose of this study is to examine the effects of many factors by means of rate of heat release calculation in Diesel Engine. In this study, first, rate of heat release was calculated with computer process, next, the effects of those factors to rate of heat release were examined, and then, the effects of injection pressure and injection time to rate of heat release were analyzed. The concluding remarks are as the followings. 1. To calculate the precise rate of heat rlease, compensation of air column vibration and the method of least square were used. 2. On calculating the rate of beat release, specific heat is variable with function of temperature. 3. Controlling of engine performance and smoke was shown to a fixed quantity by means of analyzing indicator diagram. 4. BTDC 9˚CA and 12.7 MPa are most suitable injection time and injection pressure to get a max. engine performance. 5. When the injection time is earlier than that time, knocking was occured, because of high combustion max.-pressure and high rate of pressure rise. When the injetion time is later than TDC, the engine performance due to decreasing the degree of constant volume is decreased. 6. In case too low injection pressure, engine performance is decreased, and the injection pressure is too high engine performance is also decreased.
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