Flow field of sonic underexpansion transient jet: Research on the characteristics of transient jet velocity and vortex ring translate velocity

IF 3.9 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2025-09-28 DOI:10.1016/j.vacuum.2025.114783

Shi Li , Xian-wen Ran , Wei-feng Cui , Duo Zhang , Wen-hui Tang

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Abstract

This research aims to further investigate the motion law of the sonic underexpansion transient jet and vortex ring. The functional relationship between the dimensionless peak velocity (U∗) of the jet at the center of the nozzle and the incident shock wave Mach number (Ms) is constructed. The vortex ring translate velocity (U) equation is also optimized. Three Ms including Ms = 1.414, 1.479, 1.547 are set to generate sonic underexpansion transient jet and vortex ring, and the corresponding simulations and experiments are carried out. The results show that the theoretical calculations of U∗ and U are in good agreement with the simulations. The increase in Ms results in an increase in the diameter, circulation, vortex ring translate velocity and transient jet velocity (u). The vortex ring motion process is divided into growth, pinch-off, and decay stages. In the growth stage, the vortex ring circulation grows rapidly, but its growth rate gradually decreases. The vortex ring exhibits a higher circulation growth rate at higher Ms. At the decay stage, the decay rate of vortex ring circulation is very slow compared to the growth rate during the growth stage. This indicates that the vortex ring has a strong anti-decay ability.

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音速欠膨胀瞬态射流流场：瞬态射流速度和涡环平移速度特性研究

本研究旨在进一步研究声波欠膨胀瞬态射流和旋涡环的运动规律。建立了喷嘴中心射流的无量纲峰值速度（U *）与入射激波马赫数（Ms）之间的函数关系。并对涡环平移速度方程进行了优化。设置Ms = 1.414、1.479、1.547三个Ms来产生声波欠膨胀瞬态射流和涡环，并进行了相应的仿真和实验。结果表明，U *和U的理论计算与仿真结果吻合较好。Ms的增加导致直径、环流、涡环平移速度和瞬态射流速度(u)的增加。涡旋环的运动过程分为生长、收缩和衰减三个阶段。在生长阶段，涡环环流生长迅速，但其生长速度逐渐降低。在衰减阶段，涡环环流的衰减速率与生长阶段的增长速率相比非常缓慢。这说明涡流环具有较强的抗衰减能力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.