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Fractal-generated turbulence and mixing: flow physics and some industrial implications

分形产生的湍流和混合：流动物理学和一些工业影响

基本信息

批准号：
EP/H030875/1
负责人：
John Vassilicos
金额：
$ 78.35万
依托单位：
Imperial College London
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2010
资助国家：
英国
起止时间：
2010 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FH030875%2F1
关键词：
Fractal generated turbulence mixing flow

项目摘要

New industrial flow solutions based on new flow concepts are urgentlyneeded to meet the unprecedented requirements set by the dramaticallyevolving energy, environmental and climatic constraints. What isneeded is not just improvements to existing solutions, but radical newdevelopments that can dramatically increase energy savings and reduceadverse environmental impacts. The development of new flow concepts onwhich such solutions will eventually be based requires unprecedentedfully resolved simulations and laboratory experiments because existingturbulence models cannot be applied indiscriminately on radically newflow concepts.One very recent example of a new flow concept originating from the UKis turbulent flows generated by fractal grids (figure 1). As attestedby recent patent applications by Imperial Innovations,proof-of-concept studies at Imperial and reports in various popularscience and engineering periodicals (Food Manufacture, June 2008; TheChemical Engineer, July 2008; Process Engineering, 18 July 2008;Speciality Chemicals, September 2008; Scientific Computing World,August 2008; see http://www3.imperial.ac.uk/tmfc/popular) this classof new flow concepts offers alternative solutions for industrialmixers, silent airbrakes and spoilers, natural ventilation, sun-roofsand combustion. In this proposal, we focus on new industrial staticinline mixers.These new flow concepts also pose unexpected challenges to turbulenceresearch and modelling. Over the past 60 years, efforts in turbulencehave been mostly in ad-hoc modelling of specific turbulent flows andthe progress has been limited. A fundamental understanding ofturbulence dynamics is needed if we want the development of an entireraft of new flow concepts to become a realistic possibility. For this,a well-designed and well-targeted experiment is required where theseturbulence dynamics can be set out of joint so as to give us clues forhow to understand and, if possible, control them. This is the otherfocus of this research proposal and it directly relates to the firstbecause both relate to the same new flow concept: turbulence generatedby fractal grids.

迫切需要基于新流量概念的新工业流量解决方案，以满足急剧变化的能源、环境和气候限制所设定的前所未有的要求。我们需要的不仅仅是对现有解决方案的改进，而是能够显著提高节能和减少不利环境影响的全新发展。新的流动概念的发展，这种解决方案将最终基于需要前所未有的完全解决的模拟和实验室实验，因为现有的湍流模型不能不加区别地应用于从根本上新的流动概念。一个最近的例子，一个新的流动概念起源于英国是湍流产生的分形网格（图1）。正如帝国创新公司最近的专利申请、帝国创新公司的概念验证研究以及各种流行科学和工程期刊的报告所证明的那样（《食品制造》，2008年6月;《化学工程师》，2008年7月;《工艺工程》，2008年7月18日;《特种化学品》，2008年9月;《科学计算世界》，2008年8月;见http：//www3.imperial.ac.uk/tmfc/popular）这类新的流动概念为工业混合器、静音空气制动器和扰流器、自然通风、天窗和燃烧提供了替代解决方案。在本提案中，我们将重点放在新型工业静态管道混合器上，这些新的流动概念也对连续性研究和建模提出了意想不到的挑战。在过去的60年里，在湍流方面的努力主要集中在特定湍流的特设模型上，进展有限。如果我们希望发展一整套新的流动概念成为现实的可能性，就需要对湍流动力学有一个基本的了解。为此，需要一个精心设计和有针对性的实验，这些湍流动力学可以脱离关节，以便为我们提供如何理解的线索，如果可能的话，控制它们。这是本研究建议的另一个重点，它直接关系到第一个，因为两者都涉及到同一个新的流动概念：分形网格产生的湍流。