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손진욱 ( Jin Wook Son ),전병세 ( Byung Sei Jun ) 경남대학교 신소재연구소 2014 신소재연구 Vol.26 No.-
본 연구에서는 Mullite에 LAS계의 Eucryptite를 첨가하여 고온에서도 안정하며 우수한 특성을 나타내는 복합체를 제조하고자 하였다. 첨가상인 Eucryptite는 화학적 양론비에 따라 (Li2O:AI2O3:SiO2=1:1:2) mole비에 맞추어 1000℃에서 2시간 하소하여 단일상으로 합성하였다. Mullite는 상업적으로 판매하는 것을 사용하였고 Attrition mill을 이용하여 3.8um, 합성된 Eucryptite는 0.3um로 각각 분쇄하였다. 이 두 재료를 wt. %에 따라(M:E = 10:0, 9:1, 8:2, 7:3) 혼합하여 복합재료를 제조하였으며, 감압여과(Vacuum filter)를 이용, 성형체를 제조하여 1300℃~1400℃ 까지 각각 열처리 하였으며 , 온도에 따라 얻어진 시편을 XRD(X-ray diffractometer)를 이용한 상 분석과 SEM(Scannig electron microscope)을 이용한 미세구조 관찰 등 Mullite-Eucryptite 복합체의 분해반응을 관찰하 여 고온에서의 복합체 안정성에 대해 연구하였다. In this study, the composite with stable and excellent properties was produced by the addition of the LAS Eucryptite based on Mullite at high temperatures. The Eucryptite based on their stoichiometric compound was synthesized at 1000℃ for 2hrs heat treatment. Commercial mullite powder and the synthesized Eucryptite powder were ground to 3.8um and 0.3um respectively. The composite materials were prepared by mixing these two ingredients, depending on weight ratio(M:E=10:0 or 9:1 or 8:2 or 7:3). The specimens were formed using a vacuum filter, and then heated at different temperatures from 1300℃ to 1550oe. To investigate the stability of the composite at high temperature, we observed decomposition reaction mechanism for specimen of mullite and eucryptite composite from X-ray intensity analysis using XRD(X-ray diffractometer) and microstructure using SEM(Scanning electron microscope).
복사효과를 고려한 수소/공기/불활성입자 혼합물에서의 화염전파에 대한 연구
김덕연,손진욱,백승욱,Kim, Deok Yeon,Son, Jin Wook,Baek, Seung Wook 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.8
The characteristics of flame propagation in inert particle-laden $H_2$/Air premixed gas are numerically investigated on this study. The 2nd order TVD scheme is applied to numerical analysis of governing equations and multi-step chemical reaction model and detailed transport properties are sued to solve chemical reaction terms. Radiation heat transfer is computed by applying the finite volume method to a radiative transfer equation. The burning velocities against the mole fractions of hydrogen agree well with results performed by different workers. The inert particles play significant roles in the flame propagation on account of momentum and heat transfer between gas and particles. Gas temperature, pressure and flame propagation speed are decreased as the loading ratio of particle is increased. Also the products behind flame zone contain lots of water vapor whose absorption coefficient is much larger than that of unburned gas. Thus, the radiation effect of gas and particles must be considered simultaneously for the flame propagation in a mixture of $H_2$/Air and inert particles. As a result, it is founded that because the water vapor emits much radiation and this emitted radiation is released at boundaries as radiant heat loss as well as reabsorbed by gas and particles, flame propagation speed and flame structure are altered with radiation effect.
백종훈(Baek, Jong-Hoon),손진욱(Son, Jin-Wook),심경주(Sim, Kyung-ju),정영균(Jeong, Young-Kyoon) 대한건축학회 2018 대한건축학회 학술발표대회 논문집 Vol.38 No.1
막구조를 통해 지속가능한 건축물 설계제시 이 연구의 목적은 강릉 아이스아레나의 막구조 외장 적용사례를 통해 막을 외장재로 사용하여 설계 과정 및 고려할 사항을 파악하며 지속 가능한 건축물 설계의 가능성을 제시하는데 있다.
실혐계획법을 이용한 배기 밸브시트링 설계인자의 영향도 파악 및 형상 최적화
곽영홍(Younghong Kwak),김영남(Youngnam Kim),손진욱(Jinwook Son),김홍집(Hongjip Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The performance of gasoline engine is mainly determined how effectively intake the fresh air and exhaust the burnt gases through intake port and exhaust port. As shown in many previous researches, the intake and exhaust process take its main rules in gasoline engine development. In this papers, we scrutinize the influences of design parameters of exhaust valve seat ring using orthogonal array adopting the robust design method. We use the L? orthogonal array and experiment the exhaust flow bench test to get the optimized design parameter combination in exhaust valve seat ring. Through this study, we scrutinized the influences of each valve seat ring design parameters and improved the exhaust flow coefficient about 5%.
정동원(Dongwon Jung),이병석(Byeongseok Lee),손진욱(Jinwook Son),우수형(Soohyung Woo),김영남(Youngnam Kim),오희창(Heechang Oh),한동희(Donghee Han) 한국연소학회 2019 KOSCOSYMPOSIUM논문집 Vol.2019 No.5
This study demonstrates on the technologies for the development of gasoline engine to improve brake thermal efficiency. All experiments have been conducted for stoichiometric operation at 2000RPM. The test engine is a four-cylinder 2.2L GDI engine, which has a long-stroke concept (102mm stroke and 79mm bore). The effects of compression ratio, EGR rate, the number of spark plugs, tumble ratio and super charger were explored. As a result, the maximum brake thermal efficiency can be achieved up to 44.6%.
권혁선(Hyuksun Kwon),최회명(Hoimyung Choi),민경덕(Kyoungdoug Min),손진욱(Jin-Wook Son),김우태(Wootae Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To analyze the flow characteristics of engine exhaust port, a numerical approach was established. Computational meshes were generated part by part and boundary conditions were matched with the experimental environments. The CFD results agree well with the experimental results. Port geometry was varied by changing of the design parameters and the flow characteristics were observed at several view points. The flow coefficients were evaluated at each shape of exhaust port and the effect of design parameter was investigated. This approach distinguished important port shape parameters and the flow coefficients would be improved by modifying those parameters.