基于r-PIV的滚动汽车轮胎沟槽内水流流动分析
Analysis of the water flow inside tire grooves of a rolling car using r-PIV
摘要：
为了更好地了解滑水现象，在一辆驶过水坑的真实汽车的轮胎槽内进行了水流的局部速度测量。速度场是通过结合折射粒子图像测速（r-PIV）照明，播种荧光粒子和经典的2D 2C或2D 3C立体记录安排。使用荧光对比技术，通过单独的可视化来突出显示凹槽内存在的一些气泡柱，从而证明两相流特性。一个简单的预测模型，提出了支持r-PIV分析。它提供了有用的信息，以调整聚焦距离，并了解气泡柱的存在对记录的r-PIV图像的影响，特别是对于位于凹槽上部的种子颗粒，因为荧光被气泡衰减。此外，模型提供的预测与测量结果一致。沟槽内的速度场进行了分析，使用合奏平均进行了一组独立的快照，记录相同的操作参数。几个独立的运行在一个凹槽中测量的纵向速度分布的可变性是由不同的机制，如荧光播种颗粒在凹槽的各种高度的随机位置，纵向和横向凹槽之间的流体动力学相互作用，和随机位置的横向凹槽从一个运行到另一个解释。采用立体排列法，得到了纵向沟槽横截面上的三个速度分量。它们与文献中也假定的一些纵向涡的存在是相容的。
英文摘要：
In order to better understand the hydroplaning phenomenon, local velocity measurements of water flow are performed inside the tire grooves of a real car rolling through a water puddle. Velocity fields are obtained by combining refraction Particle Image Velocimetry (r-PIV) illumination, seeding fluorescent particles and either the classical 2D2C or a 2D3C stereoscopic recording arrangements. The presence of some bubble columns inside the grooves is highlighted by separate visualisation using fluorescent contrast technique evidencing two phase flow characteristics. A simple predictive model is proposed supporting the r-PIV analysis. It provides useful information to adjust the focusing distance and to understand the effect of the bubble column presence on the recorded r-PIV images, especially for the seeding particles located in the upper part of the grooves, as fluorescent light is attenuated by the bubbles. Also, the predictions provided by the model are compatible with the measurements. The velocity fields inside the grooves are analysed using ensemble averaging performed over a set of independent snapshots, recorded with the same operating parameters. The variability of the longitudinal velocity distribution measured in a groove for several independent runs is explained by different mechanisms, like the random position of fluorescent seeding particles at various height of the groove, the hydrodynamic interactions between longitudinal and transverse grooves, and the random location of the transverse grooves from one run to an other. Three velocity components in cross-sections of the longitudinal grooves are obtained using the stereoscopic arrangement. They are compatible with the presence of some longitudinal vortices also assumed in the litterature.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
