NSF East Asia and Pacific Summer Institute (EAPSI) for FY 2013 in Japan

这项行动资助弗吉尼亚理工大学的肯尼斯·布朗在2013年夏天在东京的日本宇宙航空研究开发机构进行一个工程研究项目。 该项目的名称是“一种新型多孔壁风洞的开发及其对低噪声风力涡轮机、飞机和海军舰艇的影响”。“主持人是山本和臣博士。目前全球只有两个风洞采用了这种新型的混合消声试验段，之所以这样命名，是因为它通过使用薄而多孔的Kevlar®布墙，将类似于传统风洞的空气动力学封闭试验段与类似于开放式喷气式风洞的声学开放试验能力相结合。 由于这种试验段为航空声学研究的进步提供了重要的机会，弗吉尼亚理工大学的稳定性风洞已经开发出一种高保真度方法，用于升力干扰和阻塞的先验校正压力数据，该方法采用完全来自第一原理和独立测量的物理特性的面元法模拟。 日本宇宙航空研究开发机构的低速风洞也开发了一种修正方法，但它的基础不同于稳定性风洞。 目前的研究旨在将两个风洞的空气动力学数据结合起来，以产生一种统一的方法来校正多孔壁混合消声试验段的压力数据。研究之旅的另一个影响是弗吉尼亚理工大学的稳定性风洞和日本宇宙航空研究开发机构之间的合作，这两个组织都处于空气动力学和航空声学研究的最前沿。鉴于这两个风洞是世界上仅有的两个采用混合试验段的风洞，这项研究合作提供了一个机会，通过建立一个统一的混合试验段的气动修正方法来指导气动声学研究的过程。 对这些试验段的空气动力学特性的准确评估，与对这些试验段提供的详细声学数据的同时测量相结合，为风力涡轮机叶片、高速列车、飞机、汽车、潜艇和其他新老技术的开发提供了独特的机会。 在这些领域中的每一个，高性能空气动力学和低噪声排放声学之间的平衡必须与精度。 将风洞测量的这两个方面合并到一个试验段中具有广泛的好处，并吸引了世界领先的研究机构如NASA、DLR和ONERA的研究兴趣。 EAPSI奖学金的更广泛的影响包括为研究员提供美国以外的第一手研究经验;介绍各自所在地的科学，科学政策和科学基础设施;以及社会，文化和语言的方向。 这些活动符合NSF的目标，即在科学家，工程师和教育工作者的职业生涯早期进行国际合作教育，从而确保具有全球意识的美国科学工作者。 此外，研究结果将通过研究员的论文和其他出版物以及研究员的研讨会传播。 通过这些手段，可以认为混合试验段可能成为下一代风洞布局，从而扩大航空声学界的研究能力。

This action funds Kenneth Brown of Virginia Tech to conduct a research project in Engineering during the summer of 2013 at the Japan Aerospace Exploration Agency in Tokyo. The project title is "Development of a Novel, Porous-Walled Wind Tunnel with Implications for Low Noise Wind Turbines, Aircraft, and Naval Vessels." The host scientist is Dr. Kazuomi Yamamoto.There are yet only two wind tunnels worldwide to employ the novel hybrid anechoic test section, named as such because it integrates an aerodynamically closed test section similar to those of traditional wind tunnels with an acoustically open testing capability similar to that of open jet tunnels through the use of thin, porous Kevlar® cloth walls. Due to the significant opportunity for advances in aeroacoustics research that such a test section affords, Virginia Tech's Stability Wind Tunnel has developed a high fidelity method to a priori correct pressure data for lift interference and blockage that employs a panel method simulation derived entirely from first principles and independently measured physical properties. The Japan Aerospace Exploration Agency's Low Speed Wind Tunnel has also developed a correction method, but it derives from a different basis than that established at the Stability Wind Tunnel. The current research aims to join aerodynamic data from both wind tunnels to produce a unified method for correcting pressure data in porous-walled, hybrid anechoic test sections. Another impact of the research trip is the collaboration produced between Virginia Tech Tech's Stability Wind Tunnel and the Japan Aerospace Exploration Agency, both of which organizations are on the forefront of aerodynamics and aeroacoustics research. Given that these two tunnels are yet the only two wind tunnels worldwide to employ the hybrid test section, this research collaboration provides an opportunity to direct the course of aeroacoustics research by establishing a unified aerodynamic correction method for hybrid test sections. An accurate evaluation of the aerodynamic characteristics of such test sections, when combined with the simultaneous measurement of detailed acoustic data that such test sections afford, provides unique opportunities in the development of wind turbine blades, high-speed trains, aircraft, automobiles, submarines, and other new and old technologies. In each of these fields, the balance between high performance aerodynamics and low noise emission acoustics must be struck with precision. Incorporating these two aspects of wind tunnel measurement into one test section has widespread benefits and attracts research interest from leading world research organizations such as NASA, DLR, and ONERA. Broader impacts of an EAPSI fellowship include providing the Fellow a first-hand research experience outside the U.S.; an introduction to the science, science policy, and scientific infrastructure of the respective location; and an orientation to the society, culture and language. These activities meet the NSF goal to educate for international collaborations early in the career of its scientists, engineers, and educators, thus ensuring a globally aware U.S. scientific workforce. Furthermore, the results of the research will be disseminated through both the Fellow's thesis and additional publications and seminars by the Fellow. Through these means, it is feasible to think that hybrid test sections may emerge as the next generation wind tunnel configuration, broadening the research capability of the aeroacoustics community.