Manipulation of Supersonic Jet using Grooved Tabs

IF 1.1 4区工程技术 Q4 MECHANICS

Journal of Applied Fluid Mechanics Pub Date : 2024-05-01 DOI:10.47176/jafm.17.05.2326

A. K. Mali, T. Jana, M. Kaushik, S. Thanigaiarasu

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引用次数: 1

Abstract

This study experimentally evaluated the mixing augmentation of twin tabs mounted along a diameter at the outlet of a convergent-divergent Mach 1.62 circular nozzle. The usefulness of the plain and grooved tabs is examined at various expansion levels prevailing at nozzle outlet. The tab's performance is assessed through pitot pressure distribution measured along and perpendicular to the jet centerline at different nozzle pressure ratios (NPRs). The shadowgraph technique visualized the shocks and expansion fans in uncontrolled and controlled jets. With the introduction of uncorrugated or plain tabs at the nozzle outlet operating under overexpanded conditions corresponding to NPR 4, the supersonic length (SL) was decreased only by 35.4%. On the other hand, the corrugated or grooved tabs under similar conditions decreased the SL substantially. Interestingly, the performance of grooved tabs was best at underexpanded conditions associated with NPR 6, where the SL was reduced by about 88%. The pressure profiles also established the superiority of tabs with grooved edges in mixing augmentation without introducing any significant asymmetry to the flow field. In addition, the Shadowgraph images also confirmed the weakening of shock strength and reduction of shock-cell length in the case of grooved tabs at the nozzle exit compared to the plain

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利用凹槽片操纵超音速喷气机

本研究通过实验评估了沿直径安装在收敛-发散马赫数为 1.62 的圆形喷嘴出口处的双片的混合增强效果。在喷嘴出口处普遍存在的各种膨胀水平下，对平滑片和凹槽片的作用进行了研究。在不同的喷嘴压力比（NPRs）下，通过沿喷嘴中心线和垂直于喷嘴中心线测量的皮托管压力分布，对凹槽片的性能进行了评估。阴影图技术将不受控制和受控制喷流中的冲击和膨胀风扇可视化。在与 NPR 4 相对应的过膨胀条件下运行时，喷嘴出口处引入无波纹或平滑片，超音速长度（SL）仅减少了 35.4%。另一方面，在类似条件下，波纹或沟槽片大幅降低了超音速长度。有趣的是，在与 NPR 6 相关的低膨胀条件下，沟槽片的性能最好，SL 减少了约 88%。压力曲线也证明了带沟槽边缘的滤片在混合增强方面的优越性，而不会给流场带来任何明显的不对称。此外，Shadowgraph 图像还证实，在喷嘴出口处开槽片与普通片相比，冲击强度减弱，冲击单元长度减少。

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

Journal of Applied Fluid Mechanics THERMODYNAMICS-MECHANICS

CiteScore

2.00

自引率

20.00%

发文量

138

审稿时长

>12 weeks

期刊介绍： The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating. The motivation for this new fluid mechanics journal is driven by the following points: (1) there is a need to have an e-journal accessible to all fluid mechanics researchers, (2) scientists from third- world countries need a venue that does not incur publication costs, (3) quality papers deserve rapid and fast publication through an efficient peer review process, and (4) an outlet is needed for rapid dissemination of fluid mechanics conferences held in Asian countries. Pertaining to this latter point, there presently exist some excellent conferences devoted to the promotion of fluid mechanics in the region such as the Asian Congress of Fluid Mechanics which began in 1980 and nominally takes place in one of the Asian countries every two years. We hope that the proposed journal provides and additional impetus for promoting applied fluids research and associated activities in this continent. The journal is under the umbrella of the Physics Society of Iran with the collaboration of Isfahan University of Technology (IUT) .