Influence of the swirl vanes in convergent-divergent nozzle on screech tones and mixing efficiency at subsonic and supersonic jet flow

IF 1.2 4区工程技术 Q3 ENGINEERING, AEROSPACE

Aircraft Engineering and Aerospace Technology Pub Date : 2024-07-09 DOI:10.1108/aeat-02-2024-0046

Manigandan Sekar, Vijayaraja Kengaiah, Praveenkumar T.R., Gunasekar P.

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Abstract

Purpose

The purpose of this study is to investigate the effect of coaxial swirlers on acoustic emission and reduction of potential core length in jet engines.

Design/methodology/approach

The swirlers are introduced in the form of curved vanes with angles varied from 0° to 130°, corresponding to swirl numbers of 0–1.5. These swirlers are fixed in the annular chamber and tested at different nozzle pressure ratios of 2, 4 and 6.

Findings

The study finds that transonic tones exist for the nonswirl jet, creating an unfavorable effect. However, these screech tones are eliminated by introducing a swirl jet at the nozzle exit. Weak swirl shows a greater reduction in noise than strong swirl at subsonic conditions. In addition, the introduction of swirl jets at all pressure ratios significantly reduces jet noise and core length in supersonic conditions, mitigating the noise created by shockwaves and leading to screech tone-free jet mixing.

Originality/value

The paper provides valuable insights into the use of coaxial swirlers for noise reduction and core length reduction in jet engines, particularly in supersonic conditions.

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会聚-发散式喷嘴中的漩涡叶片对亚音速和超音速射流的尖啸音和混合效率的影响

本研究的目的是调查同轴漩涡器对喷气发动机声发射和减少潜在核心长度的影响。设计/方法/途径漩涡器以曲面叶片的形式引入，角度从 0° 到 130°，对应 0-1.5 的漩涡数。这些漩涡固定在环形腔中，并在喷嘴压力比为 2、4 和 6 的不同条件下进行测试。研究结果研究发现，非漩涡喷流存在跨音，造成不利影响。然而，在喷嘴出口处引入漩涡射流可消除这些尖啸音。在亚音速条件下，弱漩涡比强漩涡更能降低噪音。此外，在所有压力比下引入漩涡射流可显著降低超音速条件下的喷气噪声和核心长度，减轻冲击波产生的噪声，并导致无尖啸音的喷气混合。

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来源期刊

Aircraft Engineering and Aerospace Technology 工程技术-工程：宇航

CiteScore

3.20

自引率

13.30%

发文量

168

审稿时长

8 months

期刊介绍： Aircraft Engineering and Aerospace Technology provides a broad coverage of the materials and techniques employed in the aircraft and aerospace industry. Its international perspectives allow readers to keep up to date with current thinking and developments in critical areas such as coping with increasingly overcrowded airways, the development of new materials, recent breakthroughs in navigation technology - and more.