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GASOLINE ENGINE用 SPARK PLUG의 材質 및 熱特性에 關한 考察
鄭洛紀 釜山工業大學校 1971 論文集 Vol.12 No.-
The spark plug of high voltage spark ignition system for gasoline engine is performed in combustion chamber with the condition of 4000˚F or more over temperature and about 700 psia pressure. The insulator of spark plug has much improved, and at the same time the insulator has been developed satisfactorily under the thermal property of actual performance condition. However, center wire and electrode often cause troubles. In case corrosion and poor connection does not spark flame, it is mostly caused by the defect of materials or the thermal property. This literature covers, as the first step on this field, the study of the property of thermal conductivity and expresses in variation curve the temperature distribution of every parts, resulted by the process of the study. This study answers to the question of what kind of deformation the differance of temperature will effect on the material composing spark plug. The distribution of the force in reciprocal action of spark plug can be quite different according to the condition of deformation. This force can effect mutual compression or tension on the material composing spark plug. Even though there is on thermal cracking of the insulator, the force coming from the thermal expansion of the metal surrounded might cause great damage. This is guessed because certain parts of the insulator are seen heavily corroded. Of course this develops at the parts jointed with the metal, and is followed by severe corrosion on the metal, which is thought a very important phenomenon. It is hoped the temperature distribution curve presented here can be of even a slight help to the study in this field.
鄭洛紀 釜山工業大學校 1990 論文集 Vol.32 No.-
Thermal efficiency and output in variable cooling water temperature of internal combustion engine was examined. High temperature cooling system, as a methods which have applied in aero-engine, have not tried to application on automoble engine. This paper is a result that the testing on variable temperature of cooling water respond to power output and thermal efficiency of piston type recipro-machinary, automobile engine. The objectives of this examination is for the data of possibility whether high temperature cooling system should be able to automobile engine or not. Cooling water temperature at outlet port from engine set up from 30℃ to 170℃ ans each 20 degree interval as the input farameter for this experiment. The result of thid examination showes that (1), thermal efficiency and power output are significantly increase with cooling water temperature rising, especialy in low degree of throttle valve and low speed range. (2), comparison between current engine(90℃) and high temperature cooling method (150℃) with several figures.
공동주택 보일러 연소배기가스의 실내유입에 관한 수치적 연구
박외철,정락기 대한설비공학회 2003 설비공학 논문집 Vol.15 No.7
Flue gas from apartment heating gas boiler is exhausted outside through an exhaust duct mounted horizontally in a vertical row on the wall. The flue gas includes nitrogen-oxides (NOx) and carbon monoxide. To investigate the possible entrainment of the flue gas into the apartments through the windows, a large eddy simulation (LES) based numerical method is utilized. Distribution of the velocity intensity and temperature around the exhaust ducts is presented for three numerical parameters: exhaust velocity, temperature of the flue gas, and exhaust duct length. The flow field visualized with particles inserted at the ends of the ducts is also presented. The results clearly show that the exhausted flue gas may flow into the apartments when the windows are open.
이종강관 마찰용접의 소성변형 중 발생된 초기 AE양이 용접품질 제어에 미치는 영향에 관한 연구
오세규,김동조,정락기 대한용접접합학회 1983 대한용접·접합학회지 Vol.1 No.2
Both in-process quality control and reliability of the weld is one of the major concerns is applying friction welding. No reliable nondestructive monitoring method is available at present to determine the weld quality particularly in process of production. So that, this paper presents an experimental examination and quantitative analysis for the effects of initial acoustic emission(AE) counts on the weld strength relating to the rotating speed as a new approach which attempts finally to develop an on-line quality monitoring system design for friction welds using AE techniques. As one of the important results, it was well confirmed that the initial AE counts occurring during plastic deformation period of welding were quantitatively correlated with reliability at 95% confidence level to the joint strength of welds, tube-to-tube (SM 20 C to STS 304) and then an AE technique using the initial AE counts can be reliably applied to in-process strength monitoring of the weld.