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Theoretical and experimental study of the dependence of transient pipe friction on turbulence dynamics

瞬态管道摩擦力对湍流动力学依赖性的理论和实验研究

基本信息

批准号：
EP/C015177/1
负责人：
Shuisheng He
金额：
$ 19.58万
依托单位：
University of Aberdeen
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2006
资助国家：
英国
起止时间：
2006 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FC015177%2F1
关键词：
Theoretical experimental study dependence transient

项目摘要

Improvements in the accuracy of predicting unsteady flows in pipelines have opened up new research areas such as transient-based leak detection that, in turn, are demanding even greater accuracy in flow modelling. One of the biggest barriers to progress is the simulation of unsteady skin friction on pipe walls. There have been impressive intuitive advances in the past decade, but it is generally recognised that further success is hampered by inadequate understanding of turbulence dynamics in transient pipe flows. The proposed project brings together an international team of specialists in (i) turbulence, (ii) transient flow analysis and (iii) transient flow experiments in a focussed bid to break the understanding barrier.Current knowledge is so inadequate that we are not even able to predict the directions of axial shear forces on pipe walls (let alone their amplitudes) during transient events such as the propagation of pressure waves. A full discussion session was set aside for this topic at an international conference in March 2004. Experts from many countries around the world shared ideas for future research aimed at reducing the uncertainty. This research proposal focusses on the most promising way forward, namely studying dynamic interactions between axial, radial and circumferential components of turbulence in rapidly changing pipe flows. Highly detailed numerical and experimental studies in the UK and Italy will feed into assessments of 1-D numerical models used by pipe flow analysts.

预测管道中非定常流的准确性的提高开辟了新的研究领域，例如基于瞬态的泄漏检测，这反过来又要求更高的流动建模准确性。最大的障碍之一是管壁非稳态表面摩擦的模拟。在过去的十年中，已经有了令人印象深刻的直观的进步，但人们普遍认为，进一步的成功是阻碍了瞬态管流中的湍流动力学的理解不足。该项目汇集了（i）湍流，（ii）瞬态流分析和（iii）瞬态流实验方面的国际专家团队，旨在打破理解障碍。目前的知识是如此不足，以至于我们甚至无法预测在压力波传播等瞬态事件期间管壁上轴向剪切力的方向（更不用说幅度）。在2004年3月的一次国际会议上专门为这一专题安排了一次全面讨论会。来自世界各地许多国家的专家分享了未来研究的想法，旨在减少不确定性。这项研究建议侧重于最有前途的前进方向，即研究快速变化的管流中湍流的轴向、径向和周向分量之间的动态相互作用。在英国和意大利进行的非常详细的数值和实验研究将用于评估管流分析师使用的一维数值模型。