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산업용 3상 교반기 내 기체와 고체 입자의 체적 균일도 지수를 활용한 교반 성능 예측
최한호(H. Choi),최종락(J. Choi),허남건(N. Hur),정광훈(G. Jeong),임선영(S. Lim),옥태준(T. Ok) 한국전산유체공학회 2021 한국전산유체공학회지 Vol.26 No.3
In this study, transient multiphase flow simulations were carried out to evaluate the new volume uniformity indices of gas and solid particles concentrations within the 3-phase industrial stirred vessel. In the initial state, the solid phase is located at the bottom portion of the vessel with the liquid phase positioned on top. Afterwards, the gas is injected at the middle-section of the vessel from four nozzles and discharged to the top of the vessel and in the process commences the reaction between the liquid and particle phases. To focus on the mixing phenomena, this reaction process was not simulated. A sliding grid technique was adopted to describe the rotating motion of the impellers at three different stages. The mixture flows between gas, liquid, and solid particles were simulated using the Eulerian multiphase model with STAR-CCM+ V.2020.3. Since the conventional method defines volume uniformity indices based on the entire domain, there was a limitation to predict the details of volume uniformity indices of a specific phase. For the above reason, the new volume uniformity indices of the gas and solid particles in the liquid phase were proposed and compared with the conventional method by conducting the 3-phase simulations. The new volume uniformity indices of concentrations were more effective in predicting the degree of mixing level quantitatively. In such a 3-phase flow, the actual mixing degree in the stirred vessel can be determined using the proposed volume uniformity indices of concentration, which can be used to represent the stirring performance.
Giga급 강재를 활용한 자동차 차체 컨셉 및 경량부품 개발
김홍기(H.G. Kim),최한호(H.H. Choi),임지호(J.H. Lim),조열래(Y.R. Cho),유병주(B.J. Yoo) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Concept of steel intensive light weight BIW composed by giga tensile strength grades of TWIP, DP and HPF(hot press forming) materials was developed. Vehicle’s weight was reduced as much of 20% compared with the bench marking vehicle of 223.8㎏, and it showed good performance of collision and roof crush as well NVH. And weight reduced automotive parts that construct the concept were developed by adoption of various forming method such as hydroforming, stamping and hot press forming method.
오진호(J. H. Oh),최한호(H. H. Choi),박성호(S. H. Park) 한국소성·가공학회 2008 소성가공 : 한국소성가공학회지 Vol.17 No.7
The subframe type rear suspension consisting of a side member and a front/rear cross member is widely used in a medium car and full car. In the small car case, the beam of tubular type without independent suspension system is used to reduce manufacturing cost. In this study, a subframe type rear suspension by hydroforming has been developed. In designing suspension, a driving stability and durability should be considered as an important factor for the performance improvement, respectively. Thus, we focus on increasing the stiffness of suspension and decreasing the maximum stress affecting a durability cycle life. Several optimization design techniques such as shape, size, and topology optimization are implemented to meet these requirements. The shapes of rear suspension obtained from optimization are formed by using hydroforming process. Through commercial software based on the finite element, the superiority of this design method is demonstrated.