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Research on jet noise characteristics of aeroengine double S-bend nozzles with different cross sections

Jiaru Shao (Department of College of Mechanical Engineering,Chongqing University of Technology,Chongqing, China)
Xueping Mo (Department of College of Mechanical Engineering,Chongqing University of Technology,Chongqing, China)
Zijun Zheng (Department of College of Mechanical Engineering,Chongqing University of Technology,Chongqing, China)
Yu Yang (Department of College of Mechanical Engineering,Chongqing University of Technology,Chongqing, China)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 9 December 2022

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Abstract

Purpose

This study aims to improve the survivability and maneuverability of the fighter,and study the stealth performance of fighter in the jet noise of aeroengine, it is of great significance to study the jet noise characteristics of double S-bend nozzles.

Design/methodology/approach

The multiparameter coupling and super-ellipse design methods are used to design the cross section of double S-bend nozzle. Taking unsteady flow information as the equivalent sound source, the noise signal at the far-field monitoring points were calculated with Ffowcs Williams–Hawkings (FW–H) method, and then, the sound source characteristics of the double S-bend nozzle are analyzed.

Findings

The results show that the internal flow of the S-bend nozzle with rectangular section is smoothed and the aerodynamic performance is better than super-ellipse section, the shear layer length of rectangular section is longer, the thickness is smaller and the mixing ability is stronger. The sound pressure level of the two S-bend nozzles decreases with the increase of the monitoring angle, and the sound pressure on the horizontal plane is greater than the vertical plane. In the direction of 40°–120°, the jet noise of rectangular nozzle is smaller, and the multiparameter coupled rectangular cross section structure is more applicable.

Practical implications

It is beneficial to reduce the jet noise of the engine tail nozzle and improve the stealth performance of the aircraft.

Originality/value

There is very little research on the jet noise characteristics of the double S-bend nozzle. The multiparameter coupling and the super-ellipse method are used to design the nozzle flow section to study the aerodynamic performance and jet noise characteristics of the double S-bend nozzle and to improve the acoustic stealth characteristics of the aircraft.

Keywords

Acknowledgements

This study is supported by the Science and Technology Research Program of Chongqing Municipal Education Commission (Grant No. KJQN202201113, KJQN202201105).

Declaration of competing interest: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Citation

Shao, J., Mo, X., Zheng, Z. and Yang, Y. (2022), "Research on jet noise characteristics of aeroengine double S-bend nozzles with different cross sections", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/HFF-08-2022-0460

Publisher

:

Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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