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디젤엔진 성능향상을 위한 헬리컬 흡기포트의 선회유동특성에 관한 연구
윤준규,차경옥 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-
This study was experimentally analyzed to consider the swirl characteristics of helical intake port for the performance improvement in a D.I. diesel engine. The intake port flow is important factor which have influence on the engine performance because the properties in the injected fuel depend on the combustion characteristics. To analyze the characteristics of swirl, we measured flow coefficient, swirl ratio, et. by using impulse swirl torque meter on the change of valve lift and valve eccentricity ratio at the steady flow condition of the basic engine intake port. Also by hand-working the port geometry through steady flow test in order to change the swirl ratio of intake port, we made the swirl ratio of each intake port established by 1.70, 2.13 and 2.43. As results of intake flow characteristics, the distributive characteristics of flow coefficient by valve eccentricity ration increased lineally until valve lift 8mm(L/D=0.165). After this, it was showed slow increased aspects, and the swirl intensity increased whenever the valve position moved to the cylinder wall. Also I realized that the increase of swirl ratio decreases mean flow coefficient and increases the Gulf factor.
PDPA와 고속카메라에 의한 액상부탄 간헐분무 특성 연구
윤준규,임종한,김종현 한국마린엔지니어링학회 2004 한국마린엔지니어링학회지 Vol.28 No.3
The characteristics of liquefied butane spray are expected to be different from conventional diesel fuel spray, because a flash boiling spray is expected when the surround pressure is below the saturated vapor pressure of the butane(0.23MPa 98K). The axial velocities. radial velocities. and size distributions in butane sprays were measured with PDPA(Phase Doppler Particle Analyzer) system. Sprays were macroscopically observed by using the high speed camera in case that the surround pressure is 0.37MPa and 0.15MPa. respectively. Compared with the conventional spray. the reversed results were investigated when the surround pressure is below the saturated vapor pressure of the butane.
윤준규 한국마린엔지니어링학회 1998 한국마린엔지니어링학회지 Vol.22 No.6
A highly compact and thermally efficient water cooled oil cooler for automotive use without offset strip fin and casing is developed in this study. The study result has shown that eliminating the fin and casing in the oil cooler the manufacturing process and cost and can be simplified and reduced greatly without sacrificing the thermal capacity. The oil cooler developed in the study uses the dimply type heat transfer core element design instead of offset strip fin and eliminates the outer casing for coolant water flow by applying specially made parallel loop flow design. In the study the thermal design program for the present oil cooler also was developed and validated experimentally.
Analysis of spatial vapor-phase distribution using the LIF method on multi-component fuel
윤준규,명광재,J. Senda,H. Fujimoto 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.9
We analyzed the vapor-phase distribution and behavior of each component in multi-component fuel (MCF). Evaporation characteristic of MCF was researched by laser-induced fluorescent (LIF) method. A pulsed Nd-YAG laser was used as incident light, and an experiment was performed in a constant-volume vessel so that optical measurement could be possible. MCF was injected through electronically controlled common rail injector into the vessel. I-octane (C8H18), n-dodecane (C12H26) and n-hexadecane (C16H34) were selected to be low boiling point (LO-B.P.), mid boiling point (MI-B.P.) and high boiling point (HI-B.P.) components, respectively, and Fuel A, Fuel B and Fuel C, made by compounding those components at different mass fractions, were used as MCF. Experimentation was performed under the conditions that injection pressures were 42MPa, 72MPa and 112MPa, respectively, ambient gas density was 15kg/m3 and ambient gas temperature was 700K. The spatial vapor-phase distribution, dispersion process of mixture, and vaporphase homogeneity were researched. It was ascertained that the vapor-phase of MCF showed stratified distribution and the dispersion of mixture was improved in proportion to the mass fraction of the LO-B.P. component.
나선형 흡기포트의 유동특성이 과급식 디젤엔진의 성능 및 배출가스에 미치는 영향
윤준규,양진승,차경옥 한국마린엔지니어링학회 2000 한국마린엔지니어링학회지 Vol.24 No.5
This study is to consider that the helical intake port flow and fuel injection system have effects on the characteristics of engine performance and emissions in a turbocharged DI diesel engine of the displacement 9.4L. The swirl ratio for ports was modified by hand-working and measured by impulse torque swirl meter, For the effects on performance and emission, the brake torque, BSFC were measured by engine dynamometer and NOx, smoke were by gas analyzer and smoke meter. As a result of steady flow test, when the valve eccentricity ratio are closed to cylinder wall, the flow coefficient and swirl intensity are increased, And as the swirl is increased, the mean flow coefficient is decreasing, whereas the gulf factor is increasing. Also, through engine test its can be expected to meet performance and emission by the following applied parameter; the swirl ratio is 2.43, injection timing is BTDC $13^{\circ}$CA and compression is 15.5.
HFC-134a 냉매충전량의 변화에 따른 자동차용 에어컨 성능특성에 관한 연구
윤준규,임종한,김철수 한국기계기술학회 2009 한국기계기술학회지 Vol.11 No.1
HFC-134a is currently used as a refrigerant in automotive air conditioning system replacing the ozone depleting CFC-12 refrigerant. This paper was experimentally studied on the performance characteristics of an automotive air conditioning system with variations of charging refrigerant and compressor speed. An air conditioning system was composed of laminated type evaporator, parallel flow type condenser, vane rotary type compressor, externally equalized thermostatic expansion valve and receiver drier with specifications of Hyundai Sonata Ⅱ vehicle. And the automatic measuring system of air conditioner used KTE-1000BA developed by a KT ENG Co., Ltd.. of Korea. The optimum conditions which were tested as available parameters for better performance are indicated charging refrigerant 800 g and compressor speed 1700 rpm.
윤준규 경원전문대학 1998 論文集 Vol.20 No.-
This paper was experimentally studied on the characteristics of breakup mechanism by rotating disk atomizer with viscous fluid. The purpose of this study are to find breakup mechanism characteristics according to the variation of supplied flow rate and RPM, and to investigate three kinds of breakup pattern by comparing the transition flow rate, the number of ligament and ligament length to those of Tanasawa, Matsumoto's theoretical and experimental equation. The results are as follows ; The higher it makes use of viscous fluid, the better it gets the characteristics of breakup mechanism. Also, When I compared the practical value with experiential value at similar test conditions, it was shown similar tendency though were a little variation.