In-situ Diagnostics of Supercritical Flows and Combustions

超临界流动和燃烧的现场诊断

基本信息

批准号：
2026242
负责人：
Zhili Zhang
金额：
$ 33.09万
依托单位：
University of Tennessee Knoxville
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-09-01 至 2024-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2026242&HistoricalAwards=false
关键词：
situ Diagnostics Supercritical Flows Combustions

项目摘要

High-pressure flow dynamics and combustion have many applications in major industrial, transportation, and aviation sectors. A number of fundamental challenges stand as barriers to continued technical progress, including lack of understanding of real-fluid effects, turbulence, optical dense flow and combustion under various high-pressure conditions, and efficient system integration and analysis. Motivated by the lack of high-pressure flow and combustion research, the proposed project aims to develop and utilize novel diagnostic tools and to obtain benchmark data of the reactive flow and combustions at elevated pressure condition. The new insights gained from experimental data can be used to develop, calibrate, and validate combustion models at high-pressure conditions, with significant reduction in computation effort. Such models can be building blocks for designs of future propulsion systems. The goal of this project is to conduct systematic experiments to build a bridge between flows from atmospheric pressure to subcritical/transcritical/supercritical conditions with the help of novel high-spatial and -temporal resolution imaging techniques. Specifically, neutron and 2D optical (Raman) imaging techniques will be used, coupled with a variable-pressure combustion chamber. Overall, the project aims to obtain comprehensive characterization of the nozzle geometry, internal (in-nozzle) flow, near-field dense flows, and gas-phase properties in reacting flows up to supercritical pressures. Additionally, the proposed work will obtain (i) quantitative measurements of local fuel/air concentrations by 2D Raman, (ii) flow velocities by optical flow analysis of 2D Raman signal, and (iii) local temperature by ratios of Stokes and anti-Stokes Raman spectroscopy. The new understanding gained from proposed experiments and future modeling efforts will lead to improvement in performance of next generation propulsion systems.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.

高压流动动力学和燃烧在主要的工业，运输和航空部门都有许多应用。许多基本挑战是持续技术进步的障碍，包括对各种高压条件下的真实流体效应，湍流，光密流量和燃烧以及有效的系统集成和分析缺乏了解。由于缺乏高压流量和燃烧研究，该项目旨在开发和利用新型的诊断工具，并在压力升高的情况下获得反应性流量和燃烧的基准数据。从实验数据中获得的新见解可用于在高压条件下开发，校准和验证燃烧模型，并大大减少计算工作。这样的模型可以是未来推进系统设计的基础。该项目的目的是进行系统的实验，以借助新型的高空间和 - 颞分辨率成像技术，在从大气压到亚临界/跨批评/超临界条件之间建立桥梁。具体而言，将使用中子和2D光学（拉曼）成像技术，并与可变的压力燃烧室结合使用。总体而言，该项目旨在获得喷嘴几何形状，内部（无声嘴）流动，近场量流和气相特性的全面表征，反应流向超临界压力。此外，提议的工作将通过2D拉曼获得（II）通过2D拉曼信号的光流分析以及（iii）局部温度按stokes和反stokes Raman Spectroscopopicy进行局部温度来获得（ii）通过2D拉曼的局部燃料/空气浓度进行定量测量。从拟议的实验和未来的建模工作中获得的新理解将改善下一代推进系统的绩效。该奖项反映了NSF的法定任务，并且使用基金会的知识分子优点和更广泛的影响审查标准，认为值得通过评估来获得支持。