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Modelling A-Pillar Water Overflow: Developing CFD and Experimental Methods

机译:模拟A柱水溢出:开发CFD和实验方法

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Water accumulating on a vehicle's wind screen, driven over the A-pillar by a combination of aerodynamic forces and the action of the windscreen wipers, can be a significant impediment to driver vision. Surface water film, or streams, persisting in key vision areas of the side glass can impair the drivers' ability to see clearly through to the door mirror, and laterally onto junctions. Common countermeasures include: water management channels and hydrophobic glass coatings. Water management channels have both design and wind noise implications. Hydrophobic coatings entail significant cost. In order to manage this design optimisation issue a water film and wiper effect model has been developed in collaboration with Jaguar Land Rover, extending the capabilities of the PowerFLOW CFD software. This is complimented by a wind-tunnel based test method for development and validation. The paper presents the progress made to date. The test method, based on installing a rain grid in a climatic wind runnel, is described. Boundary condition data is extracted to aid CFD model development. This includes: flow similarity assessment against a full scale aerodynamic wind tunnel, water spray flux measurements, screen water distribution, and A-pillar overflow measurements. The CFD method is described and its predictions are compared to experimental data. This includes a simple model to represent the effect of the wiper system. Finally, areas for further improvement in both experimental and computational methods are identified.
机译:空气动力和挡风玻璃刮水器的共同作用将积聚在车辆挡风玻璃上的水驱动到A柱上方,这可能会严重阻碍驾驶员的视线。残留在侧玻璃关键视觉区域中的地表水膜或水流会削弱驾驶者从车门后视镜清楚地看到并横向观察接合处的能力。常见的对策包括:水管理渠道和疏水性玻璃涂层。水管理渠道对设计和风噪声都有影响。疏水涂料需要大量成本。为了管理该设计优化问题,已与Jaguar Land Rover合作开发了水膜和刮水器效果模型,从而扩展了PowerFLOW CFD软件的功能。这是基于风洞的测试方法进行开发和验证的补充。本文介绍了迄今为止取得的进展。描述了基于在气候风洞中安装雨网的测试方法。提取边界条件数据以帮助CFD模型开发。这包括:针对全尺寸空气动力学风洞的流量相似性评估,喷水通量测量,筛网水分布和A柱溢流测量。描述了CFD方法,并将其预测结果与实验数据进行了比较。这包括代表刮水器系统效果的简单模型。最后,确定了在实验和计算方法上都需要进一步改进的领域。

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