MRI: Development of a Versatile, Self-Configuring Turbulent Flow Condition System for a Shared-Use Hybrid Low-Speed Wind Tunnel

MRI：发展天文研究所，推进模拟近地复杂风场的基础研究边界层风洞是模拟近地风场的动态风场的重要研究工具。s表面。这种风流被应用于建筑物和其他结构的模型，以确定它们的预期性能，并设计它们以经受极端的风事件。在实验室中精确地复制自然风并不是小事。方法和设备根据风力条件（龙卷风、飓风、雷暴等）而有所不同，以及被研究对象的地理位置（靠近海岸、在郊区社区等）。目前的风洞设施在这方面是有限的，每一个都能够解决一小部分的风现象。该奖项支持开发一种仪器，大大扩展了单个设施的能力，以研究自然界中观察到的各种风况，并评估它们如何影响建筑和自然环境。这一能力将加快发现速度，并为解决弹性基础设施发展中的问题开辟道路。其他应用包括研究污染物扩散、风能资源选址、生物力学、人类对危险的感知以及微型飞行器的开发。该项目的参与者来自五大洲。因此，该仪器的开发将通过实现边界层风洞技术的突破来增强美国的竞争力，同时加强影响整个人口稠密世界的风灾问题的国际合作。其目标是开发一种能够模拟非定常、非中性或过渡表面流的仪器。例子包括流入陆地环境的近海飓风、雷暴中的非静止阵风锋、高空切变运动引起的瞬态相干结构以及风驱动的雨。该仪器将命令静态和动态控制装置，自动重新配置，以实现用户指定的相似性要求，如非单调的配置文件，空间可变的功率谱和积分长度尺度，瞬态阵风，和雨夹带在流场。这些控制装置必须串联工作（一级调节下一级），以实现仪器的预期功能。该工具包括根据现有概念验证研究和有待开发的新技术改编的组成部分。开发该仪器的框架是一个常规的边界层风洞设计，目标是创建一个适合在世界各地设施中实施的工具。

MRI: Develop Inastrumentation to Advance Fundamental Research on Simulating Complex Wind Flow Near the Earth's SurfaceThe boundary layer wind tunnel is an essential research tool for creating dynamic wind flow that replicates the natural behavior of wind near the Earth?s surface. This wind flow is applied to models of buildings and other structures to determine their expected performance and to design them to survive extreme wind events. The accurate replication of natural wind in a laboratory is not trivial. The methods and equipment vary depending upon the wind condition (tornadoes, hurricanes, thunderstorms, etc.), and the geographic location of the object being studied (near the coast, in a suburban community, etc.). Current wind tunnel facilities are limited in this regard, each capable of addressing a small subset of wind phenomena. This award supports the development of an instrument that vastly expands the capability of a single facility to study a wide range of wind conditions observed in nature and assess how they affect the built and natural environments. This capability will accelerate the rate of discovery and open pathways to solving problems in the development of resilient infrastructure. Other applications include the study of pollutant dispersion, siting of wind energy resources, biomechanics, human perception of hazards, and micro aerial vehicle development. The project includes participants from five continents. Thus the development of this instrument will strengthen US competitiveness by enabling a breakthrough in boundary layer wind tunnel technology, while enhancing international collaboration on wind hazard issues that impact the entire populated world.The objective is to develop an instrument capable of simulating nonstationary, non-neutral or transitioning surface flows. Examples include offshore hurricane winds flowing into a terrestrial environment, non-stationary gust fronts in thunderstorms, transient coherent structures induced by the shearing motion aloft and wind-driven rain. The instrument will command static and dynamic control devices that automatically reconfigure to achieve user-specified similarity requirements such as non-monotonic profiles, spatially variable power spectra and integral length scales, transient gusts, and rain entrainment in the flow field. These control devices must work in series (one stage conditions the next) to achieve the intended function of the instrument. The instrument includes components adapted from existing proof-of-concept studies and new technology to be developed. The framework on which the instrument is to be developed is a conventional boundary layer wind tunnel design, as a goal is to create a tool suitable for implementation in facilities worldwide.