A time domain approach for shock noise prediction with decomposition analyses of large-scale coherent turbulent structures in jets

Shen, Weiqi; Patel, Trushant K.; Miller, Steven A.

doi:10.1016/j.jsv.2021.115996

Cited by 3 publications

(1 citation statement)

References 41 publications

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“…The velocity on the centerline of the subsonic jet decreases with the increase of Mach number, and the large-scale turbulent structure in the form of wave packets plays an important role in generating significant shallow angle noise radiation of the jet (Cavalieri et al , 2012; Prasad and Gaitonde, 2021), while the low-frequency jet noise is generated by unstable wave packets of the shear layer (Vk et al , 2020). Broadband shock-associated noise is one of the main components of supersonic jets and most noise sources are distributed at the interaction between shock and turbulence (Shen et al , 2021). Compared with the vortex jet, the swirling jet can eliminate the transonic noise (Balakrishnan and Srinivasan, 2017a, 2017b).…”

Section: Introductionmentioning

confidence: 99%

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

Shao

Zheng

et al. 2022

HFF

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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.

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