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한현욱(Hyun Wook Han),박현호(Hyun Ho Park),김문상(Moon Sang Kim),하종백(Jong Paek Ha),김용년(Yong Nyun Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This study investigates the effects of OSRVM configurations such as bezel, stalk lengths, and head planview shape, etc. on the aerodynamic performance of the passenger car. In order to validate the flow solver, FLUENT which is a very well-known commercial code, the flow field around an Ahmed Body was analyzed numerically and compared with the experimental data. The predicted aerodynamic performance shows a good agreement with the experimental data. In the present paper, two parameters, which are the bezel and stalk length, are considered and presented. The other parameters will be studied in the near future.
공력소음 해석절차 구축 및 OSRVM 외형변경에 따른 공력소음해석
박현호(Hyun Ho Park),한현욱(Hyun Wook Han),김문상(Moon Sang Kim),하종백(Jong Paek Ha),김용년(Yong Nyun Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The transient flow field around an OSRVM is analyzed using the FLUENT and the sound radiation is predicted using the Ffowkes Williams and Hawkings analogy to analyze the wind noise around an OSRVM. Numerical results are compared with the available experimental data to validate the flow solver accuracy and the established analysis procedure. Five design key parameters of OSRVM, which are housing heights, stalk heights, shrouding depths, stalk depths, and housing lengths, are selected and parametric studies are performed numerically to figure out the effects of geometric shapes on the wind noise. In the present paper, however, only one parameter, which is the stalk heights, is studied and presented. The other parameters will be studied in the near future.
박현호(Hyun Ho Park),김지웅(Ji Woong Kim),김문상(Moon Sang Kim),하종백(Jong Paek Ha),김용년(Yong Nyun Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The process of the wind noise analysis around OSRVM is constructed and is confirmed by simulating unsteady flow field past a generic side mirror mounted on the flat plate at the Reynolds number of R<SUP>e</SUP>D = 5.2×10? based on the mirror diameter. The transient flow field past a generic OSRVM is simulated with various turbulence models, namely DES and LES. The sound radiation is predicted using the Ffowkes-Williams and Hawkings analogy. For the present simulation, the 6.25 million cells are generated. Time averaged pressure coefficients at 34 locations on the surface of the generic OSRVM are compared with the available experimental data. Also, 12 Sound Pressure Levels located on the surrounding mirror are compared with the available experimental data. Both of them show good agreements with experimental data. Here, LES yields better solutions than DES.
OSRVM의 형상 매개변수에 따른 승용 차량의 공력성능 해석
한현욱(Hyun Wook Han),박현호(Hyun Ho Park),김문상(Moon Sang Kim),하종백(Jong Paek Ha),김용년(Yong Nyun Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
This study investigates the effects of OSRVM configurations such as mounting locations, housing heights, stalk heights, shrouding depths, stalk depths, and housing lengths, etc. on the aerodynamic performance of the passenger car. In order to validate the flow solver, FLUENT which is a very well-known commercial code, the flow field around an Ahmed body was analyzed numerically and compared with the experimental data. The predicted aerodynamic performance shows a good agreement with the experimental data. In the present paper, only three parameters, which are the mounting locations, stalk heights, and housing heights are studied and presented.
OSRVM의 형상 및 장착 위치에 따른 승용 차량의 공력성능 해석
한현욱(Hyun Wook Han),김지웅(Ji Woong Kim),김문상(Moon Sang Kim),하종백(Jong Paek Ha),김용년(Yong Nyun Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
This paper investigates the effects of OSRVM configurations such as mounting locations, housing heights, stalk heights, etc. on the aerodynamic performance of a passenger car. In the present paper, only one parameter, which is the mounting locations, is studied and presented. The other parameters will be studied in the near future. The OSRVM is mounted at the locations of -10㎜, -5㎜, 10㎜, 20㎜, 30㎜, 40㎜, and 50㎜ from the original location of the OSRVM. FLUENT, which is a very well-known commercial code, is used to analyze the aerodynamic performance of the passenger car.
OSRVM의 형상 및 장착 위치가 차량의 공력성능에 미치는 영향
한현욱(Hyun Wook Han),박현호(Hyun Ho Park),김문상(Moon Sang Kim),하종백(Jong Paek Ha),김용년(Yong Nyun Kim) 한국자동차공학회 2013 한국 자동차공학회논문집 Vol.21 No.3
This study investigates the effects of OSRVM mounting location and its configurations such as stalk height and housing height on the aerodynamic performance of the passenger car. In order to validate the flow solver, FLUENT which is very well known commercial code, the flow field around an Ahmed Body was analyzed numerically and compared with the experimental data. The predicted aerodynamic performance and flow patterns around a car show good agreements with the experimental data. Mounting location and stalk height should be designed while OSRVM is mounted on the car to evaluate the aerodynamic performance precisely. Housing height, however, may be designed independent of the car because the aerodynamic interference between housing height and car configuration is negligible.
하종백,김상녕 경희대학교 산학협력기술연구원 1996 산학협력기술연구논문집 Vol.2 No.-
To improve the conventional ring spinning process, a passive rotating ring floated by air has been proposed. The main feature of this passive system is the rotation of the ring by the friction force between the ring and the traveller. As the ring rotates, the ring with blades pumps the air into the gap between the ring and the stator and finally lifts itself in the air. Since there is only air friction, the ring rotation improves the spinning productivity and quality. The most difficult problems for a passive ring are to produce adequate lifting force and stabilize the ring. By applying turbomachinery(centrifugal blower) principle to this system, a passive ring with blades around the body was aerodynamically designed and manufactured. The proposed ring experimentally showed the possibility of its passive function. And the ring could be axially stabilized by a partially grooved design feature.