TENSOR: Turbulent boundary layer and trailing Edge Noise Study Of flow past a porous surface at high Reynolds number

张量：高雷诺数下流过多孔表面的湍流边界层和后缘噪声研究

• 批准号: EP/X032590/1
• 负责人: Prateek Jaiswal
• 金额: $ 24.26万
• 依托单位: University of Southampton
• 依托单位国家: 英国
• 项目类别: Fellowship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FX032590%2F1
• 关键词: TENSOR; Turbulent; boundary; layer; trailing

Two aspects of porous materials that substantially influence the turbulent boundary layer convecting over them are surface roughness and permeability, and although their individual effects is well documented, their combined action and non-linear interaction are poorly understood. Nevertheless, nature and engineering are replete with examples; therefore, a comprehensive study of turbulent flows over and past these surfaces is proposed at high Reynolds number. This is important because previous numerical studies were limited to low-moderate Reynolds number due to computational costs, while experiments have altered the surface roughness and permeability at the same time; thus, their relative contribution could not be assessed. Therefore, a novel methodology is proposed to decouple surface roughness from permeability, which will be used to examine their relative importance on noise and drag. The project pairs a researcher with experience in aeroacoustics with an expert in applied experimental fluid mechanics, achieving a mutually beneficial exchange of knowledge. The Fellow will parametrically survey the effects of porous materials on velocity-pressure statistics, followed by a detailed investigation of the underlying flow physics using Tomographic PIV velocimetry to establish cause-and-effect mechanisms between porous materials and turbulent boundary layer. Finally, to measure the relative contribution of surface roughness and permeability on the scattering efficiency of trailing-edge, the ratio of the scattered far-field to the incident wall-pressure statistics will be quantified at the anechoic wind tunnel. The project will target its dissemination activities atscientific communities where the immediate impact is expected, including thermal engineering and biology. Together with the host's capabilities and track record, will ensure successful completion of this ambitious research project and maximally support the fellow's career development.

表面粗糙度和渗透率是多孔材料对其表面湍流边界层有重要影响的两个方面，尽管它们各自的影响已有很好的文献记载，但它们的联合作用和非线性相互作用却知之甚少。然而，自然界和工程界都有大量的例子；因此，在高雷诺数的情况下，建议对这些表面的湍流流动进行全面的研究。这一点很重要，因为由于计算成本的原因，以前的数值研究仅限于中低雷诺数，而实验同时改变了表面粗糙度和渗透率，因此无法评估它们的相对贡献。因此，提出了一种新的方法来分离表面粗糙度和渗透率，这将被用来检验它们对噪声和阻力的相对重要性。该项目将一名在空气声学方面有经验的研究人员与一名应用实验流体力学专家配对，实现了互惠互利的知识交流。这位研究员将对多孔材料对速度-压力统计的影响进行参数调查，然后使用层析PIV测速仪详细研究潜在的流动物理，以建立多孔材料和湍流边界层之间的因果机制。最后，为了测量表面粗糙度和渗透率对后缘散射效率的相对贡献，在消声风洞中将散射远场与入射壁压统计的比率量化。该项目将把其传播活动的目标对准预计会产生直接影响的科学界，包括热工和生物学。加上东道主的能力和记录，将确保成功完成这一雄心勃勃的研究项目，并最大限度地支持研究员的职业发展。