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RISS 인기검색어
- 검색키워드
- 저자 : Alexander Broniewicz (검색결과 2 건)
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Emil Ljungskog,Simone Sebben,Alexander Broniewicz,Christoffer Landström 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.6
Computational fluid dynamics (CFD) is an important and extensively used tool for aerodynamic development in the vehicle industrytoday. Validation of virtual methods by comparison to wind tunnel experiments is a must because manufacturers aim to substitute physicaltests on prototype vehicles with virtual simulations. An appropriate validation can be performed only if the wind tunnel geometrywith representative boundary conditions is included in the numerical simulation, and if the flow of the empty wind tunnel is accuratelypredicted. One of the important flow parameters to predict is the longitudinal pressure distribution in the test section, which is dependenton both the wind tunnel geometry and the settings of the boundary layer control systems. This study investigates the effects of flow angularityat the inlet and different boundary layer control systems, namely, basic scoop suction, distributed suction, and moving belts, on thelongitudinal pressure distribution in the full-scale aerodynamic wind tunnel of Volvo Cars using CFD and a systematic design of experimentsapproach. The study shows that the different suction systems used to reduce boundary layer thickness upstream of the vehicle havestatistically significant effects on the longitudinal pressure distribution in the test section. However, the estimated drag difference inducedon a typical vehicle by the difference in horizontal buoyancy between the tested settings is within the test-to-test uncertainty of the physicalwind tunnel, thereby leading to the conclusion that force calculations in simulations are fairly insensitive to the tested parameters onthe investigated intervals.
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EFFECTS OF WHEEL CONFIGURATION ON THE FLOW FIELD AND THE DRAG COEFFICIENT OF A PASSENGER VEHICLE
Michael Donald Peter Bolzon,Simone Sebben,Alexander Broniewicz 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.4
The effects of wheel rotation, rim coverage area, fan spokes, spoke sharpness, and tread pattern on the flow field and drag coefficient of a passenger vehicle were investigated. Force measurements and wake surveys were taken on a 1/ 5th scale passenger vehicle at a Reynolds number of 2.0 × 106. The wake surveys were conducted at three planes. Vorticity, total pressure coefficient, and local drag coefficient plots are presented. Wheel rotation reduced the drag coefficient of all of the wheel configurations tested, which generally agrees with literature. Wheel rotation reduced the front wheel’s jetting vortex’s drag while increasing the drag from the center of the front wheel to the upper rim track. Reducing the rim coverage area increased the drag coefficient. This increase was attributed to an increased jetting vortex drag and a change in flow separation around the front wheel. The fan spoke rim performed the worst, regardless of rotation. Rounding the spoke edges reduced the drag coefficient of a rotating wheel. The tread pattern slightly reduced the shoulder vortex vorticity and slightly increased the separation around the front wheel.
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