CAREER: Experimental Investigation into the Impact of Incoming Boundary Layer State on the Unsteady Dynamics of a Transverse Jet in a Hypersonic Crossflow

职业：高超声速横流中传入边界层状态对横向射流非定常动力学影响的实验研究

• 批准号: 2239156
• 负责人: Christopher Combs
• 金额: $ 61.79万
• 依托单位: University of Texas at San Antonio
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-04-15 至 2028-03-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2239156&HistoricalAwards=false
• 关键词: CAREER; Experimental; Investigation; into; Impact

Hypersonic flight has obvious appeal given the potential to connect people across the globe by reducing international travel times by a factor of 5 or more, enhancing access to space, and strengthening national defense. Traditional aerodynamic control surfaces seen on aircraft like flaps and fins are ineffective at certain speeds and high altitudes owing primarily to the low pressures and densities in the Earth’s upper atmosphere. This necessitates the use of alternative means of vehicle control for hypersonic systems, which generally takes the form of control jets. An improved understanding of the physics of these interactions will also help improve high-speed engine efficiency and reduce their carbon footprint. When fired into a high-speed flow; however, these jets can create massive disturbances in the flowfield that are complex to model. The current lack of proper predictive tools has rendered jet-based control and fuel-injection unreliable, yet little validation-quality experimental data for this fundamental problem exists in the current literature base. This project will address this need by producing validation-quality experimental datasets of jets issuing into a hypersonic crossflow using the Mach 7 wind tunnel facility at The University of Texas at San Antonio. The acquired data will help unravel the complex physics of this critical flow phenomenon and impact future high-speed vehicle design.This research program will be accomplished in three phases: 1) in-depth characterization of the unsteady dynamics of a jet-in-crossflow over a wide high-speed parameter space; 2) comparison of jet-in-crossflow fluid physics to an analogous standing cylinder geometry; 3) investigation of the transient dynamics of the initiation of a jet in a high-speed crossflow. This work will impact hypersonic aerodynamic research by: 1) quantifying unsteady dynamics and surface loads of jet-in-cross-flow interactions for varied incoming boundary layer states and Mach numbers; 2) characterizing the impact of these jet interactions on control moments for a flat plate; 3) generating validation data for model development. This research will also be tightly integrated with educational outreach. Given the diverse population in San Antonio and The University of Texas at San Antonio’s status as a minority-serving institution, this project will serve as a platform to engage a diverse group of students. The ambitious educational activities include the incorporation of research into new courses (100 students per semester) and design projects through innovative curricula. Internship experiences with local community college partners will support at least three summer students each year.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

高超音速飞行具有明显的吸引力，因为它有可能通过将国际旅行时间减少五倍或更多来连接全球各地的人们，增加进入太空的机会，并加强飞机上传统的空气动力学控制面（如襟翼和尾翼）的无效性。主要是由于地球高层大气的低压和密度，在一定的速度和高海拔下，这需要使用高超音速系统的替代飞行器控制手段，通常采用控制喷气机的形式。更好地了解这些相互作用的物理原理也将有助于提高高速发动机的效率并减少其碳足迹；然而，当喷射到高速流中时，这些射流可能会在流场中产生巨大的扰动，而这种扰动很难建模。目前缺乏适当的预测工具，导致基于喷气机的控制和燃油喷射不可靠，但当前文献库中几乎没有针对这一基本问题的验证质量实验数据，该项目将通过生成验证质量实验数据集来满足这一需求。喷气机进入高超音速使用德克萨斯大学圣安东尼奥分校的 7 马赫风洞设施进行横流分析。获得的数据将有助于揭示这种临界流动现象的复杂物理原理，并影响未来的高速车辆设计。该研究计划将分三个阶段完成： 1) 深入表征宽广的高速参数空间内横流射流的非定常动力学；2) 横流射流流体物理与类似的直立圆柱体几何形状的比较；3) 瞬态研究；启动的动力学这项工作将通过以下方式影响高超音速空气动力学研究：1）量化不同传入边界层状态和马赫数的交叉流相互作用的非定常动力学和表面载荷2）表征影响；这些射流相互作用对平板控制力矩的影响；3) 生成用于模型开发的验证数据，鉴于圣安东尼奥的人口多样性和德克萨斯大学圣安东尼奥分校的地位。少数族裔服务该项目将作为一个平台，吸引多元化的学生群体参与，包括将研究纳入新课程（每学期 100 名学生），并通过与当地社区大学合作伙伴的创新课程设计项目。每年支持至少三名暑期学生。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。