Annular impinging jets controlled by synthetic jets inducing a swirling flow character

IF 1.7 4区计算机科学 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Journal of Visualization Pub Date : 2024-03-16 DOI:10.1007/s12650-024-00972-4

Y. Devani, Z. Antošová, Z. Trávníček

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Abstract

Experimental research was conducted on an annular air jet. The active flow control was introduced by means of tangentially arranged synthetic jets. Flow visualization and measurements of the flow velocity and stagnation pressure on an impingement wall were performed. Tests were carried out with Reynolds numbers ranging from 4000 to 10,000 (evaluated from the outer exit diameter of the annular nozzle). Bistability and hysteretic effects were revealed, because two alternative flow field patterns (A and B) were identified under the same boundary conditions. In the A pattern, a small recirculation area (bubble) of separated flow was attached to the nozzle centerbody. In the B pattern, a large recirculation area of separated flow bridged the entire nozzle-to-wall distance. The effect of the Reynolds number was evaluated: the hysteresis and bistability were not observed for Re ≥ 9000. Concerning the effect of flow control, it was concluded that a moderate swirling effect can effectively suppress the hysteresis and bistability.

Graphical abstract

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由合成射流控制的环形冲击射流诱发漩涡流特性

对环形空气射流进行了实验研究。通过切向排列的合成射流引入了主动流量控制。对撞击壁上的流速和滞流压力进行了可视化和测量。测试的雷诺数范围为 4000 到 10000（从环形喷嘴的外部出口直径评估）。由于在相同的边界条件下发现了两种不同的流场模式（A 和 B），因此揭示了双稳态和滞后效应。在 A 模式中，喷嘴中心体上附有分离流的小再循环区（气泡）。在 B 模式中，分离流的大再循环区域弥合了整个喷嘴到壁面的距离。对雷诺数的影响进行了评估：当雷诺数≥ 9000 时，没有观察到滞后和双稳态现象。关于流量控制的影响，结论是适度的漩涡效应可有效抑制滞后和双稳态。

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来源期刊

Journal of Visualization COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS-IMAGING SCIENCE & PHOTOGRAPHIC TECHNOLOGY

CiteScore

3.40

自引率

5.90%

发文量

审稿时长

>12 weeks

期刊介绍： Visualization is an interdisciplinary imaging science devoted to making the invisible visible through the techniques of experimental visualization and computer-aided visualization. The scope of the Journal is to provide a place to exchange information on the latest visualization technology and its application by the presentation of latest papers of both researchers and technicians.