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임태은 ( Tae Eun Lim ),이계복 ( Kye Bock Lee ),이충구 ( Chung Gu Lee ) 충북대학교 산업과학기술연구소 2009 산업과학기술연구 논문집 Vol.23 No.2
A numerical study was conducted to find the optimal design of the vacuum pump for automobile. The degree of vacuum was examined for different design factors such as the angle of vanes, the number of vanes, the angle of pump inlet and outlet pipe and the angular velocity of the vane. The result shows that there is little difference in the rate of pressure decrease due to the change of the vane angle. As the angular velocity increases, the mass flow rate increases proportionally. In addition, when the number of vanes is changed 4 to 6 and 6 to 8, a scattering range of mass flow rate decreases 34% and 29% respectively, and the pressure drop is abated.
소수력 발전용 횡류수차의 최적설계를 위한 유동장 수치해석
임태은 ( Tae Eun Lim ),이계복 ( Kye Bock Lee ),정규원 ( Kyu Won Jeong ) 충북대학교 산업과학기술연구소 2010 산업과학기술연구 논문집 Vol.24 No.2
The CFD code is commonly used in many fields to reduce the cost and time of designing a product. Hydro-power attracts increasing attention in point of the effective use of water resources and it occupied as the circular energy system. The numerical study was conducted to find the optimal design of a cross flow turbine. In this paper several simple models were designed from the inlet nozzle to the outlet nozzle for numerical analysis of small sized cross flow turbine. For the analysis the Gambit was used and each model was composed of approximately 130,000 non-uniform grids. Solutions are conducted for the velocity distribution, velocity magnitude, internal flow, hydraulic characteristics for the cross flow turbine.
자동차용 진공펌프 멀티 베인의 최적 설계를 위한 유동장 수치해석
임태은(Tae Eun Lim),이계복(Kye Bock Lee) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.9
진공 펌프의 최적설계를 위해 수치해석을 수행하였다. 진공 베인 펌프 설계인자인 베인 각도 변화, 입출구 파이프의 위치와 각도 변화, 베인 개수 변화와 회전속도에 따른 진공도의 영향을 평가하였다. 베인 각도 변화는 동일한 체적의 유지로 최대 진공도 값에 큰 영향을 미치지 않았으나, 토출부의 각도 변화는 유동흐름의 간섭을 줄일 수 있고 이것으로 인한 펌프의 손실을 줄일 수 있다. 회전속도가 증가할수록 질량유량은 증가하였으나 고속 회전속도에서 최대 진공도 값을 나타내지는 않았다. 또한 베인의 개수가 증가할수록 질량유량의 변화폭은 감소하였고, 압력강하는 완화됨을 확인하였다. A numerical study was conducted to determine the optimal design for a vehicle vacuum pump. The degree of vacuum was examined for different design factors such as the angle of vanes, number of vanes, angle and position of the pump inlet-outlet pipe, and angular rotational speed of vanes. The results show that there is a little difference in the degree of vacuum when the angle of vanes are changed, but an angular change in the outlet pipe reduces the pump loss. As the rotational speed is increased, the mass flow rate increases, but a high rotational speed does not result in the maximum degree of vacuum. In addition, when the number of vanes is increased, the scattering range of mass flow rate decreases and pressure drop is abated.