Quantitative Definition of Spray Edge with Extinction Diagnostics and Evaluation of Attenuation Coefficient for Liquid Jets in Supersonic Crossflow

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2023-10-27 DOI:10.1115/1.4063887

Aubrey McKelvy, James Braun, Guillermo Paniagua, Thierry Andre, Etienne Choquet, Francois Falempin

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Abstract

Abstract We present a quantifiable, reproducible, and repeatable definition of the three-dimensional spray width and depth for a canonical jet in an open-source supersonic crossflow. An expanding Mach 2 dry-air crossflow is generated through a converging-diverging nozzle with a 25.4 mm by 230 mm wide throat area. A one-millimeter injector with ethanol seeding provides the liquid injection. Injector characteristics and losses are quantified through a calibrated cavitating venturi. Momentum flux ratios ranged from 0.1 to 20, and Reynolds number scaled by the injector diameter ranged from 5,000 to 40,000. A shadowgraph setup with a telecentric lens provides uniform magnification for precise and repeatable measurements from injection to 150 mm downstream of the jet. A Phantom v2012 camera with a frame rate of 20 kHz and shutter time of 285 ns was employed. Light transmittance is defined and calculated for each image pixel with a ratio method paired with no-spray images collected immediately before injection. These values are then related to an attenuation coefficient by incorporating spray width profiles collected with cross-sectional Mie-scatter imaging at multiple axial locations with a burst mode laser.

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超声速横流中液体射流消光诊断的喷雾边缘定量定义及衰减系数评估

摘要我们提出了一个可量化的、可重复的、可重复的三维喷流宽度和深度的定义，用于开放源代码的超声速横流规范射流。通过喉道面积为25.4 mm × 230 mm宽的会聚-发散喷管产生膨胀的2马赫干空气横流。带有乙醇种子的一毫米注射器提供液体注射。通过校准的空化文丘里管来量化注入器的特性和损失。动量通量比范围为0.1 ~ 20，喷油器直径换算的雷诺数范围为5000 ~ 40000。带有远心透镜的阴影成像装置提供了均匀的放大倍率，从喷射到射流下游150毫米处进行精确和可重复的测量。采用帧率为20 kHz、快门时间为285 ns的Phantom v2012相机。定义并计算每个图像像素的透光率，使用比率法与注射前立即收集的无喷涂图像配对。然后，这些值与衰减系数相关，通过结合在多个轴向位置使用爆发模式激光器的横断面mie散射成像收集的喷雾宽度剖面。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.