http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
RNG k-ε 난류모델을 이용한 유동박리 및 선회를 가지는 난류유동의 예측
김성구(S. K. Kim),오군섭(K. S. Oh),김용모(Y. M. Kim),이창식(C. S. Lee) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.5
This study is concerned with the critical evaluation of predicative capability of a k-ε turbulence model using the Renormalization Group(RNG) theory. The present numerical model for solution of the Navier-Stokes System is based on the modified PISO algorithms. Computations have been performed with the RNG-based k-ε model for the two-dimensional flow over a backward-facing step, a confined coaxial jet, and a swirling flow in a swirl combustor. Numerical results are compared with experimental data in terms of mean flow velocities, turbulent kinetic energy, and turbulent stresses. Numerical results clearly indicate that the RNG-based k-e turbulence model shows a significant improvement over a standard k-ε model in predicting the turbulent flows with flow separation and swirl.<br/>
김성구(S. K. Kim),안국영(K. Y. Ahn),김용모(Y. M. Kim),이창식(C. S. Lee) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.5
Numerical study of a confined, swirling, isothermal and spray-com busting flows has been presented. The pressure-velocity coupling in the Eulerian gas-phase equation is handled by the improved PISO algorithm. the droplet dispersion by turbulence is introduced by a Stochastic Separated Flow(SSF) model. The k-? turbulence model and the eddy dissipation model are employed to account for turbulence-combustion interaction. The detailed comparison with experimental data has been made for the isothermal jet swirling flows and the nearly mono disperse spray-combusting flow in the swirl combustor.<br/>
단백질 소수성 측정 방법에 관한 연구 형광법 및 소수성 분획법
김성구,이삼빈,이철호 ( Sung Koo Kim,K . B . Song,Y . C . Choi,S . K . Rhee,M . H . Han ) 생화학분자생물학회 1985 BMB Reports Vol.18 No.2
The effective hydrophobicity of different proteins, BSA, lysozyme, α-chymotrypsin, trypsin, β-lactoglobulin, myoglobin, ovalbumin, casein, soybean protein 7S and 11S fractions, rapeseed protein isolate, were determined by fluorometric method using ANS as chromophore and hydrophobic partitioning technique using polyethylene glycol) and PEG-palmitate bi-phasic system. The optimum excitation and emission wave lengthes for the measurement of relative fluorescence intensity of protein-ANS complex were 380 ㎚ and 465 ㎚, respectively. The relative intensity was influenced by the concentration indicating high level of hydorphobicity, whereas those of ovalbum and soybean protein 11S fraction were low. The hydrophobic partition coefficient (△logK) gave similar results as shown in fluorometric method. The △log K of BSA and casein were 1.625 and 1.660, respectively, while those of ovalbumin and soybean 11s fraction were 0.216 and 0.170. The changes in the effective hydrophobicity of proteins in solutions at different pH, ionic strength and heat treatment, could be related to the structural characteristic of the proteins.
액체로켓 엔진 연소장치 개발에 있어서의 전산유체역학 적용 사례
조미옥(M. Joh),김성구(S.-K. Kim),한상훈(S.H. Han),최환석(H.-S. Choi) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
This paper provides a brief introduction to application examples of the computational fluid dynamics to development of combustion devices for domestic liquid-propellant rocket engines. It is demonstrated that multi-dimensional flow analysis and multi-disciplinary combustion/cooling performance analysis can be effectively applied to provide key information on some performance-related design issues for thrust chambers and gas generators. Efforts are being made to understand complex physical phenomena inside these combustion devices, especially near the injection plate, by resolving mixing/combustion characteristics of LOX/kerosene with taking the geometry of liquid-liquid coaxial swirl injectors into consideration.