Turbulent Jet Flow Dynamics and Noise Control
Summary
Turbulent jet flow dynamics spans the evolution of shear-driven instabilities at a nozzle exit through to the development and breakdown of coherent structures downstream. Central to this process are Kelvin–Helmholtz instabilities, which give rise to organised wavepacket formations that govern entrainment, mixing efficiency and aeroacoustic radiation. In supersonic jets, interactions between turbulent eddies and shock-cell structures generate tonal phenomena such as screech, while broadband noise arises from turbulent‐eddy scattering. Noise-control strategies range from active flow control—using unsteady minijet actuators or plasma actuators—to passive treatments such as acoustic liners and metamaterials based on Helmholtz resonators. These approaches seek to balance thrust performance with environmental noise regulations. Recent developments in high-fidelity simulations, novel materials and optimisation algorithms have underpinned quieter, more efficient jet designs for applications in aviation, space launch and industrial processing.
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Turbulent Jet Flow Dynamics and Noise Control publication trend
The graph below shows the total number of articles in turbulent jet flow dynamics and noise control across all publications each year (not limited to Nature Index journals).
Technical terms
Turbulent jet: A high-velocity fluid stream characterised by chaotic fluctuations and mixing with the ambient medium.
Mixing layer: The region of shear and vorticity that forms between a jet core and surrounding fluid, driving entrainment.
Entrainment: The process by which ambient fluid is drawn into and mixed with the jet flow.
Kelvin–Helmholtz instability: A shear‐layer instability that leads to the formation of coherent vortical structures.
Shock-cell: Periodic compression and expansion regions in a supersonic jet that influence noise generation.
Screech: A tonal noise produced by feedback between instability wavepackets and shock-cell structures in compressible jets.
Wavepacket: A spatially localised group of coherent fluctuations that travels as a packet of energy.
Large-Eddy Simulation (LES): A computational method resolving large turbulent scales while modelling smaller scales, widely used in aeroacoustics.
References
- Review of launcher lift-off noise prediction and mitigation. Results in Engineering (2024).
- Entrainment rate predictions of axis-symmetric non-swirling jets using free-jet-theory, Reynolds-averaged Navier-Stokes modelling and large-eddy-simulations resolved up to Kolmogorov scale. Journal of the Energy Institute (2024).
- A unifying theory of jet screech. Journal of Fluid Mechanics (2022).
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