RISS 검색 - 국내학술지논문

1
동력 조향계 최적화에 의한 연비 개선

조석현(Sok Hyun Jo),남경우(Kyung Woo Nam),권오성(O Sung Kwon) 한국자동차공학회 2006 한국 자동차공학회논문집 Vol.14 No.3
- 원문보기 2
  ScienceON
  
  DBpia
This paper deals with energy-saving effort in the hydraulic power steering system. Commonly, the hydraulic power steering systems are used for passenger cars and the reduction of pumping loss under non-steering condition is important to improve fuel economy. Experiments and simulations are performed simultaneously to examine the main factors to reduce the pumping loss - pressure loss and flow rate of the power steering systems. Fuel economy effect of the optimal design of power steering system is verified by vehicle test - more than 1% fuel consuming reduction is attained.
2
전산유체역학을 이용한 워터펌프 축력 저감

조석현(Sok-Hyun Jo),신동성(Dong-Sung Shin) 한국자동차공학회 2012 한국 자동차공학회논문집 Vol.20 No.3
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  ScienceON
  
  DBpia
Computational Fluid Dynamics (CFD) method has been used to investigate the axial force of automotive water pump. As the excessive axial force can make some unexpected problems like impeller interference and coolant leakage we have focused on finding the cause of axial force and its reduction in this paper. First, we have tested the closed type water pump with and without balance hole by the calculation methods. By examining the pressure contour around the impeller, we have found that the axial force arises not only from the pressure difference around shroud but also from the pressure difference around hub. So we have tested two impellers - one is normal open type impeller and the other is open type impeller with modified hub. The results show that the axial force reduction is about 150~200N for normal one and 700N@3000RPM for modified impeller. And the hydraulic efficiency which is important in aspect of engine fuel efficiency is reduced about 6.5% for normal one but increased 4%@3000RPM for modified impeller.
3
엔진 연비 향상을 위한 오일펌프 사이즈/형상 최적화

조석현(Jo Sok-Hyun),남경우(Nam Kyung-Woo) 한국자동차공학회 2008 한국 자동차공학회논문집 Vol.16 No.1
- 원문보기 2
  ScienceON
  
  DBpia
Generally block imbedded type oil pump is adopted to make a small engine. In this paper 1D/3D numerical simulations were conducted to reduce energy consumption of the block imbedded type oil pump. At each stage of engine development wehave estimated the oil flow rate and pressure to optimize oil pump sizes by using the 1D system analysis and then accomplished 3D CFD(Computational Fluid Dynamics) simulations to optimize oil pump shapes including inlet/outlet port. As a result, the energy consumption of oil pump has been reduced to nearly 27% and the engine fuel consumption to 1~1.5%.
4
엔진 윤활용 제로터 오일펌프 유동해석

남경우(Nahm Kyung-Woo),조석현(Jo Sok-Hyun),박재인(Park Jae-In) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
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Numerical simulations were conducted on the gerotor type oil pump. Three oil pump models having different port and groove shape were considered. Firstly, two original models (baseline & variant.1 model) were simulated in order to validate the accuracy of the simulation results and to better understand the flow characteristics in the pump. It was found that the cavitation phenomenon as well as the teeth tip leakage is most important parameter on the pump performance. Based on simulation results of the original models, final model (variant.2 model) which have improved port shape and pressure relief valve is suggested to enhance pump performance and to reduce driving torque. The volumetric efficiency and the hydraulic torque of the Variant.2 model is improved 4% and reduced 6.1% each at 2000RPM in experiment.

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