Large eddy simulation of a supersonic lifted jet flame in the high-enthalpy coflows

Liu, Chaoyang; Wang, Ning; Yang, Kai; Jia, Dongpeng; Pan, Yu

doi:10.1016/j.actaastro.2021.03.031

Cited by 9 publications

(1 citation statement)

References 47 publications

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“…To obtain the aerodynamic performance of the double S-bend nozzle, the SST k-ω model and the Roe-FDS flux scheme are used to calculate the flow field, and the turbulent kinetic energy and dissipation rate terms are both solved by the second-order upwind difference. The LES method is used to calculate the transient flow field, the large-scale vortices are obtained by weighted integration through the filter function and the small-scale vortices are transported by the sub-lattice stress (Liu et al , 2021). The sound field is calculated by the FW–H method, and the unsteady flow field information calculated by the LES method is used as the equivalent sound source.…”

Section: Numerical Model and Validationmentioning

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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Section: Numerical Model and Validationmentioning

confidence: 99%