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Windscreen angle and Hood inclination optimization for drag reduction in cars

机译：前挡风玻璃角度和引擎盖倾斜度优化，可减少汽车的阻力

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Drag reduction in cars is evident by the angle of windscreen inclination. Drag reduction helps to reduce emissions. Windscreen inclination affects the height of the vehicle. The curvature of the windscreen should be optimized in order to avoid the cross-wind effect. The dimensions of the windscreen of a car are obtained from works of literature and modelled in modelling software. Firstly, the effect on windscreen inclination with respect to drag is studied using ANSYS Fluent. CFD analysis is done with inlet velocity of 25 m/s and the influence of vehicle height against the drag coefficient is identified. By varying inlet velocity of air, the pressure contours in the frontal hood of the vehicle are studied. Hood inclination should be optimized for minimum drag. From the studies, it is observed that 32 ° back windscreen angle gives the minimum CD. The front windscreen angle should be below 45° for minimum drag and CDis decreasing linearly as hood inclination increases. The angle of windscreen inclination proposed such that it does not affect driver visibility. It should accumulate the raindrops and dirt effectively. Windscreen inclination angle selected such that it does not affect the stability due to change in vehicle dimensions. The drag coefficient is reduced by optimizing the frontal area. The windscreen inclination is obtained by taking visibility concerns into account. From the studies, It is observed that front windscreen angle 60°, back windscreen angle 32° and 15° hood inclination gives the minimum CDas 0.320.
机译：汽车的减阻通过挡风玻璃倾斜角度可以明显看出。减阻有助于减少排放。挡风玻璃的倾斜度会影响车辆的高度。挡风玻璃的曲率应优化以避免侧风效应。汽车挡风玻璃的尺寸可从文献资料中获得，并在建模软件中进行建模。首先，使用ANSYS Fluent研究了风阻对风挡倾斜的影响。以25 m / s的入口速度进行CFD分析，并确定了车辆高度对阻力系数的影响。通过改变进气速度，研究了车辆前发动机罩中的压力轮廓。发动机罩的倾斜度应进行优化以减小阻力。从研究中可以看出，后挡风玻璃角度为32°时，CD最小。前挡风玻璃角度应小于45°，以减小风阻，并且CDis随发动机罩倾斜度的增加呈线性减小。提议的挡风玻璃倾斜角度应使其不影响驾驶员的视野。它应该有效地积聚雨滴和污垢。选择挡风玻璃倾斜角度，使其不会因车辆尺寸变化而影响稳定性。通过优化额叶面积可以降低阻力系数。挡风玻璃的倾斜度是通过考虑可见性获得的。从研究中可以看出，前挡风玻璃角度为60°，后挡风玻璃角度为32°，发动机罩倾斜角度为15°时，最小CDas为0.320。

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