Erosional jets, the ultimate challenge in coupled flow-particle dynamics: Application to industrial post operational clean out

侵蚀射流，耦合流-颗粒动力学的终极挑战：在工业运行后清理中的应用

• 批准号: 2596386
• 金额: --
• 依托单位: University of Leeds
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2596386
• 关键词: Erosional; jets; ultimate; challenge; coupled

Impinging jets are used in a wide range of process engineering applications, such as tunnelling operations, paint spraying and cavitation drilling. Liquid jets are also used as a method to estimate sediment strength in natural environment studies. They are additionally important within the nuclear waste industry for mixing of radioactive wastes, as they are preferred over mechanical impellers, due to the lack of moving parts. Despite this wide relevance of multiphase jet mixing systems, quantitative studies of their flow-profiles, turbulence and recirculation in sediment beds are lacking, while current predictions of erosion thresholds are also empirical. Difficulties arise in characterisation, due to the complex impingement profiles and because traditional laser or image techniques cannot be used at high solids loads. As an alternative, this PhD project will seek new research to investigate the application of acoustic Doppler and backscatter instruments to characterise these complex flows and their erosion profiles. Measurements will be coupled with multiphase CFD simulations of the jets, to specifically enable the prediction of impinging jet mixers used to mobilise nuclear wastes, as part of post operational clean out (POCO) operations at Sellafield Ltd.

冲击射流广泛用于工艺工程应用，例如隧道作业、喷漆和空化钻孔。液体射流也被用作估计自然环境研究中沉积物强度的方法。它们在核废料工业中对于放射性废物的混合也很重要，因为由于缺乏移动部件，它们比机械叶轮更受欢迎。尽管多相射流混合系统具有广泛的相关性，但缺乏对其流动剖面、沉积物床中的湍流和再循环的定量研究，而目前对侵蚀阈值的预测也是经验性的。由于复杂的冲击曲线以及传统的激光或图像技术不能在高固体负载下使用，因此在表征方面出现了困难。作为替代方案，该博士项目将寻求新的研究来调查声学多普勒和反向散射仪器的应用，以表征这些复杂的流动及其侵蚀剖面。测量结果将与射流的多相 CFD 模拟相结合，以专门预测用于调动核废料的冲击射流混合器，作为塞拉菲尔德有限公司运行后清理 (POCO) 操作的一部分。