High Speed Liquid Jet and Droplet Impaction on a Moving Surface

移动表面上的高速液体射流和液滴冲击

• 批准号: 419603-2011
• 负责人: Green, Sheldon
• 金额: $ 3.59万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=531463
• 关键词: Speed; Liquid; Jet; Droplet; Impaction

Spray nozzles are employed by Kelsan Technologies Corporation to distribute a thin film of a proprietary liquid friction modifier (FM) onto the top rail surface of conventional railroad tracks. In addition to reducing friction on rail tracks, Kelsan's patent FM liquid, KELTRACK®, has reduced train fuel consumption, and rail and wheel flange wear. The current mode of FM application, involving FM liquid atomization through spray nozzle application, distributes FM to rail tracks unevenly in the presence of a cross-wind, causing FM liquid to be carried back onto the spray nozzle, resulting in nozzle fouling. To ameliorate the problems associated with spray deflection in a crosswind, we will study the application of FM by means of a high speed liquid jet. To study LFM impingement with a surface moving at velocities comparable to train speeds (>200 km/h) we will eject an LFM jet onto a spinning disk device. We will measure the effects of nozzle back pressure and diameter, rail velocity and roughness, LFM composition, and LFM and rail temperature on jet impingement. Because the air boundary layer on the surface upon which a liquid jet impinges affects splash, we will also study the role of surrounding air pressure on liquid jet impingement. We will construct a vacuum chamber in which a liquid jet impacts a moving belt. By altering ambient air pressure levels within the device, we will measure the effect of air pressure on jet impingement. To study single droplet impaction on a high speed moving surface, we will construct a wind tunnel device in which a liquid droplet is convected towards a moving belt. Tests will be run using different liquid drop solutions, surface roughnesses, and wind tunnel and surface velocities. Finally, to understand the environment to which the FM jet is exposed, we will measure the local air velocity at various locations underneath a moving train, comparing these results with the wind velocities measured at a distance away from the train. The proposed research will refine FM application methods used on rail tracks, enhancing KELTRACK's® beneficial effect on top of rail friction reduction, fuel saving and rail equipment upkeep.

Kelsan Technologies Corporation 使用喷嘴将专有的液体摩擦改进剂 (FM) 薄膜分布到传统铁轨的顶部钢轨表面。除了减少铁轨上的摩擦之外，Kelsan 的专利 FM 液体 KELTRACK® 还减少了火车燃油消耗以及铁轨和车轮法兰磨损。目前的 FM 应用模式是通过喷嘴将 FM 液体雾化，在存在侧风的情况下，FM 液体会不均匀地分布到铁轨上，导致 FM 液体被带回到喷嘴上，从而导致喷嘴结垢。为了改善侧风中喷雾偏转的问题，我们将研究高速液体射流的 FM 应用。为了研究以与火车速度（> 200 km/h）相当的速度移动的表面的 LFM 撞击，我们将把 LFM 射流喷射到旋转的盘装置上。我们将测量喷嘴背压和直径、轨道速度和粗糙度、LFM 成分以及 LFM 和轨道温度对射流冲击的影响。由于液体射流撞击表面的空气边界层会影响飞溅，因此我们还将研究周围气压对液体射流撞击的作用。我们将建造一个真空室，其中液体射流冲击移动的皮带。通过改变设备内的环境气压水平，我们将测量气压对射流冲击的影响。为了研究高速移动表面上的单液滴撞击，我们将构建一个风洞装置，其中液滴向移动带进行对流。测试将使用不同的液滴溶液、表面粗糙度以及风洞和表面速度进行。最后，为了了解 FM 喷射所暴露的环境，我们将测量行驶中的火车下方不同位置的局部风速，并将这些结果与在远离火车的地方测量的风速进行比较。拟议的研究将完善铁路轨道上使用的 FM 应用方法，增强 KELTRACK's® 在减少铁路摩擦、节省燃料和铁路设备维护方面的有益效果。