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김시범(S. P. Kim),권순석(S. S. Kwon) 한국해양공학회 1988 韓國海洋工學會誌 Vol.2 No.1
The exergy analysis on the heat storage performance of the sensible heat storage unit which consists of the heat storage material in the concentric annulus and the hot fluid flowing through the inner tube is performed.<br/> Heat transfer characteristics which are necessary for the performance of the exergy analysis is obtained from the energy balance equations and the second law of thermodynamics.<br/> As the index of heat storage performance, the exergy loss number Ns, and exergy storage ratio from the concepts of the second law of thermodynamics are defined.<br/> Results are obtained for the geometry of the storage unit, the Biot number Bi, ambient temperature To as parameters. From these results the exergy storage ratio can be considered as the efficiency of the heat storage unit and is introduced as a guide to design.
정방형 발열체를 갖는 수직채널 내부의 공기유동 관한 PIV계측
배석태(S.T.Bae),김동균(D.K.Kim),김시범(S.P.Kim),조대환(DH.Cho),이영호(Y.H.Lee) 한국태양에너지학회 1997 한국태양에너지학회 논문집 Vol.17 No.3
정방형 발열체를 갖는 수직채널내부의 공기유동을 고찰하고자 레이저를 광원으로하는 가시화 실험을 행하였다. 영상처리시스템은 퍼스널컴퓨터의 내부에 장착할 수 있는 범용의 이미지보오드로 구성하였고 광원우로서는 아르곤-이온레이저와 원통형렌즈를 히용하여 시이트라이트를 만들어 이를 대상 유동장에 조사하고 유동장의 영상을 기록하였다. 전유동장의 순시속도벡터는 2차원 PIV시스템에 의하여 구하였고 채택된 동일입자추적기법은 계조치상호상관법이다. 발열체의 발열량은 5W로 균일하며 유입유속은 0.3m/sec으로 일정하게 하였다. 가시화를 통한 PIV계측 결과는 운동에너지와 난류운동에너지의 분포 등에서 유동패턴을 잘 나타내었다. An experimental study was carried out in a vertical channel with square heat source by visualization equipment with laser apparatus. The image processing system consists of one commercial image board slit into a personal computer and 2-dirrensional sheet light by Argon-Ion Laser with cylindrical lens and flow picture recording system Instant simultaneous velocity vectors at whole field were measured by 2-D PIV system which adopted two-frame grey-level cross correlation algorithm Heat source was uniform heat flux(5W). The obtained results show various flow patterns such as the kinetic energy distribution and the turbulent kinetic energy distribution.
권순석(S.S. Kwon),김시범(S.P. Kim),구본영(B. Y. Koo) 한국해양공학회 1990 韓國海洋工學會誌 Vol.4 No.2
A numerical study on the cylindrical packed bed sensible heat storage unit was accomplished by finite difference method. Relation between the heat storage rate and the mechanical pumping energy and the characteristics of the heat storage were investigated for various inlet velocities and porosities.<br/> In this study, the numerical results are as follows :<br/> 1) The temperature distributions of solid and fluid rapidly reached the steady state as the heat capacity ratio was increased.<br/> 2) The efficiency of the heat storage was increased as the heat capacity ratio was decreased. For constant heat capacity ratio, howover, the efficiency of the heat storage was increased at lower porosity.<br/> 3) It is very profitable to design the heat storage system such that the porosity is larger for the large flow rate and samller for small flow rate.
농도분포에 따른 산업용 교반기 Impeller 설계에 관한 연구
김동균(D.K.Kim),배석태(S.T.Bae),이철재(C.J.Lee),윤정호(J.H.Yoon),박재현(J.H.Park),김시범(S.P.Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Industrial Mixers are used in various industrial fields where they are necessary to intimately mix two reactants in a short period of time. However, despite their widespread use, complex unsteady flow characteristics of industrial mixers are not systematically investigated. the present study aims for clarify unsteady flow characteristics induced by various impellers in a tank. Impellers are pitched blade turbine(PBT) types, Screw type and Rushton turbine type. In this study flow characteristics of the Impeller using distribution of concentration. The rotating speed of impellers are fixed by 100RPM.
[論文] Micro-Computer를 이용한 機關 실린더 내의 壓力測定 및 燃燒解析에 관한 硏究
김희연(Kim H.N),김시범(Kim S.P),하종율(Ha J.Y) 한국자동차공학회 1988 오토저널 Vol.10 No.3
마이크로 컴퓨터, A/D變換器 및 간단한 電氣的 補助回路를 사용하여 機關 실린더 내의 壓力變化 測定裝置를 開發하였다.<br/> 실린더내 壓力變化의 測定을 위한 데이터 採取時에는, 크럭 信號나 크랭크角의 信號를 트리거(trigger)로 이용하였으며, 試驗機關은 單氣筒 4Cycle 가솔린機關을 使用하였다.<br/> 本 測定裝置로써 測定한 실린더 내의 壓力變化로 부터 壓縮變化과 燃燒壓力의 變化過程, 圓示平均有效壓力, 燃燒最高壓力과 發生時期, 點火時期, 燃燒振動의 有無, 壓力上昇率, 熱發生率과 燃燒率, 燃燒終了時期 및<br/> 後燃燒過程등의 燃燒解析에 관한 知識을 얻을 수 있음을 確認하였다. The measurement system of the pressure in engine cylinder is developed with the aids of the microcomputer,A/D converter and simple electrical circuits.<br/> The experiment is performed in 4 cycle single cylinder Gasoline engine. When data for the pressure progress is sampled, clock signal or signal from the crank angle is used as trigger.<br/> The variation of the pressure during the cycles can be well obtained experimentally. So,the informations which are necessary in the combustion analysis,i.e. expansion pressure,indicated mean effective pressure, the magnitude and time of the maximum pressure ignition time, the rate of pressure rise and heat release and combustion rates can be obtained by the calculation using experimental data. Also, the informations about the after-burning process, the existence of the detonation waves and end time of combustion can be investigated from this study.
일정 열유속으로 가열되는 수직원통 주위의 유체에서의 자연대류에 관한 연구
이철재,김시범,Lee, C.J.,Kim, S.P. 대한설비공학회 1988 설비저널 Vol.17 No.4
Series expansion is applied to solve the laminar boundary layer equations for the problem of natural convection from vertical cylinder with uniform surface heat flux. The series in terms of transverse curvature parameter ${\xi}$ is extended to five terms and is well converged by applying the Shanks transform twice. In case of natural convection from a vertical cylinder heated with uniform surface heat flux, it is possible to consider the vertical cylinder as vertical plate under the condition of D/L${\geq}$A/$(Gr_L^*)^{1/5}$, where A is in the range of 5.7~55.2. Also, mean Nusselt number ${\overline{Nu_L}}$ can be represented as $C_1(Ra_L^*)^{1/5}$, where $C_1$ is a constant which depends on Pr and is in the range of 0.5~0.8.