Temperature effects on the noise source mechanisms in a realistic subsonic dual-stream jet

Biolchini, Romain; Daviller, Guillaume; Bailly, Christophe; Bodard, Guillaume

doi:10.1016/j.compfluid.2020.104720

Cited by 4 publications

(1 citation statement)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, it can reduce the high frequency turbulent noise from the edge of the perforating fairing. Under heating conditions, the area ratio of the dual jet nozzle has a greater impact on the jet noise (Biolchini et al , 2020; Lee et al , 2019; Zhao et al , 2020).…”

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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

Effect of increasing bypass ratio on supersonic co-flowing jet with finite lip thickness

Ganesan,

Naren Shankar,

Satish Kumar

et al. 2024

International Journal of Heat and Fluid Flow

View full text Add to dashboard Cite

Kinematic analyses of wave–packet structures in non-isothermal jet flows: Effects of length scales

Liu,

Lai

2023

Physics of Fluids

View full text Add to dashboard Cite

A kinematic wave–packet sound-source model is developed for non-isothermal jets based on large eddy simulation results of subsonic jets at temperature ratios 0.86, 1.0, and 2.7. To find the suitable variable for the sound-source model, coherent structures in these jets are extracted by leading modes of the proper orthogonal decomposition (POD), and they are classified according to spatial–temporal features. To extend the model, an approach is proposed to represent the growth and decay length scales separately by a single continuous function. Applying such function, the acoustic affections are discussed for the variable length scales of amplitude envelope, L, and coherence, Lc. The results show that the jet temperature desynchronizes the leading POD modes of radial velocity, pressure, and density, and the jet temperature changes the density mode from radial puffs into stripes or ridges. The axisymmetric component of the pressure clearly presents a train of radiant waves, as captured by its leading spectral-POD mode at the peak radiation frequency. Therefore, this pressure component is employed for modeling. In the wave-number domain, the elongation of L stretches the cross-spectral density (CSD) of the source signal, denoted by CSD(k1, k2), along the k1- and k2-axes; the decay of Lc stretches the CSD along the diagonal of the axes. Both of them tend to spread the CSD into a radiant region near the origin point, so as to enhance the radiation. The radiation seems insensitive to the variation of the L, as it only slightly distorts the CSD in the radiant region.

show abstract

Temperature effects on the noise source mechanisms in a realistic subsonic dual-stream jet

Cited by 4 publications

References 60 publications

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

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

Effect of increasing bypass ratio on supersonic co-flowing jet with finite lip thickness

Kinematic analyses of wave–packet structures in non-isothermal jet flows: Effects of length scales

Contact Info

Product

Resources

About