In-situ Diagnostics of Supercritical Flows and Combustions

超临界流动和燃烧的现场诊断

• 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

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.

高压流体动力学和燃烧在主要的工业、运输和航空领域有许多应用。一些根本性的挑战阻碍了持续的技术进步，包括缺乏对真实流体效应、湍流、各种高压条件下的光学密集流和燃烧的理解，以及有效的系统集成和分析。由于缺乏高压流动和燃烧研究，该项目旨在开发和利用新的诊断工具，并获得在高压条件下的反应性流动和燃烧的基准数据。从实验数据中获得的新见解可用于开发，校准和验证高压条件下的燃烧模型，大大减少了计算工作量。这些模型可以为未来推进系统的设计提供基础。该项目的目标是进行系统的实验，在新的高空间和时间分辨率成像技术的帮助下，在从大气压到亚临界/跨临界/超临界条件的流动之间建立一座桥梁。具体地说，将使用中子和二维光学（拉曼）成像技术，再加上可变压力燃烧室。总的来说，该项目旨在获得全面的表征喷嘴的几何形状，内部（喷嘴内）流，近场稠密流，和气相特性的反应流到超临界压力。此外，拟议的工作将获得（i）定量测量的局部燃料/空气浓度的二维拉曼，（ii）流速的二维拉曼信号的光流分析，和（iii）局部温度的斯托克斯和反斯托克斯拉曼光谱的比率。从拟议的实验和未来的建模工作中获得的新的理解将导致下一代推进系统性能的改进。该奖项反映了NSF的法定使命，并被认为是值得通过使用基金会的知识价值和更广泛的影响审查标准进行评估的支持。

项目成果

1D Temperature Measurement of a Supersonic Air Jet with N2 Resonantly Ionized Photoemission Thermometry

使用 N2 共振电离光电发射测温法测量超音速空气射流的一维温度

• DOI: 10.2514/6.2023-0222
• 发表时间: 2023
• 期刊: AIAA SciTech
• 作者: Clark, Aleksander M.;McCord, Walker;Pride, Kyle;Zhang, Zhili
• 通讯作者: Zhang, Zhili

One-dimensional air temperature measurements by air resonance enhanced multiphoton Ionization thermometry (ART)

通过空气共振增强多光子电离测温 (ART) 进行一维空气温度测量

• DOI: 10.1364/oe.455572
• 发表时间: 2022
• 期刊: Optics Express
• 影响因子: 3.8
• 作者: McCord, Walker;Clark, Aleksander;Zhang, Zhili
• 通讯作者: Zhang, Zhili

Simultaneous measurements of forward Thomson scattering and rotational Raman scattering in a weakly ionized plasma

同时测量弱电离等离子体中的前向汤姆逊散射和旋转拉曼散射

• DOI: 10.1364/optcon.474339
• 发表时间: 2023
• 期刊: Optics Continuum
• 作者: He, Zichen;Ranganathan, Rajagopalan V.;Froedge, D. T.;Zhang, Zhili
• 通讯作者: Zhang, Zhili

O 2 based resonantly ionized photoemission thermometry analysis of supersonic flows

基于O 2 的超声速流共振电离光电子测温分析

• DOI: 10.1364/oe.471021
• 发表时间: 2022
• 期刊: Optics Express
• 影响因子: 3.8
• 作者: McCord, Walker;Gragston, Mark;Plemmons, David;Zhang, Zhili
• 通讯作者: Zhang, Zhili

Single-camera stereoscopic 3D multiplexed structured image capture for quantitative fuel-to-air ratio mapping

• DOI: 10.1016/j.optlaseng.2021.106945
• 发表时间: 2022
• 期刊: Optics and Lasers in Engineering
• 影响因子: 4.6
• 作者: Walker McCord;Cary D. Smith;Zhilian Zhang