Influence of viscosity on entropy noise generation through a nozzle

Huet, Maxime; Emmanuelli, Ariane; Ducruix, Sébastien

doi:10.1016/j.jsv.2021.116293

Cited by 8 publications

(5 citation statements)

References 42 publications

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“…Recent numerical simulations indicate hypotheses (i), (ii) and (iii) sound reasonable: viscous effects are limited to the boundary layers which are expected to be thin and without significant impact in the stator [29][30][31]; thermal protection of the turbine blades by film cooling makes the adiabatic assumption invalid in practice, but its impact on stator transfer functions is very limited [32]; temperature-dependent heat capacities do not significantly alter noise production and scattering [33]; 3D-flow effects have little impact on entropy noise generation [29]. To end, hypotheses (iv) and (v) do not apply to 2D numerical simulations.…”

Section: Analytical Modelmentioning

confidence: 97%

Modeling of indirect combustion noise through a stator

Huet

Geiger

2022

Journal of Sound and Vibration

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Section: Analytical Modelmentioning

confidence: 97%

Modeling of indirect combustion noise through a stator

Huet

Geiger

2022

Journal of Sound and Vibration

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“…The results were compared with the transfer functions obtained with a low-order physics-based model for non-isentropic nozzle flows, which relies on a semi-empirical parameter (De Domenico et al 2019). Huet, Emmanuelli & Ducruix (2021) studied the influence of viscosity on entropy-noise generation and scattering. Additionally, Yang, Guzmán-Iñigo & Morgans (2020) and Guzmán-Iñigo et al (2022) modelled the effect of non-isentropicity in entropy-noise generation in a sudden area expansion, which is a canonical flow with separation and mean pressure losses.…”

Section: Introductionmentioning

confidence: 99%

“…2019). Huet, Emmanuelli & Ducruix (2021) studied the influence of viscosity on entropy-noise generation and scattering. Additionally, Yang, Guzmán-Iñigo & Morgans (2020) and Guzmán-Iñigo et al.…”

Section: Introductionmentioning

confidence: 99%

Compositional noise in nozzles with dissipation

Jain

Magri

2023

J. Fluid Mech.

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We propose a physical model to predict indirect noise generated by the acceleration of compositional inhomogeneities in nozzles with viscous dissipation (non-isentropic nozzles). First, we derive the quasi-one-dimensional equations from the conservation laws of multicomponent flows. Second, we validate the proposed model with the experimental data available in the literature for binary mixtures of four gases. Third, we calculate the nozzle transfer functions for different Helmholtz numbers and friction factors, in both subsonic and supersonic flows with/without shock waves. We show that friction and dissipation have a significant effect on the generation of indirect noise, for which the physical mechanism is identified and explained. Fourth, we find a semi-analytical solution with path integrals, which provides an asymptotic expansion with respect to the Helmholtz number. Fifth, we introduce the compositional-noise scaling factor, which is applied to quickly estimate compositional noise from the knowledge of only one single-component gas transfer function. The approximation error is less than $1\,\%$ . The proposed low-order model provides accurate estimates of the transfer functions and physical insight into indirect noise for multicomponent gases. This opens up new possibilities to accurately predict, and understand, sound generation in gas turbines.

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“…Intrinsic noise inside solids has been studied extensively for applications in various fields. Huet et al investigated the contribution of viscosity to the generation and scattering of entropy noise in nozzles 1 . Hoffmann et al studied the effect of damping on mode coupling instability in friction-induced vibration 2 .…”

Section: Introductionmentioning

confidence: 99%

Understanding the physical mechanism of intrinsic noise inside viscous isotropic solids

Wang

Gong

et al. 2022

Sci Rep

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We report acoustic impulse-response and system function of particle vibration inside viscous, dense solids and explain the physical mechanism of intrinsic-noise generation. With an external disturbance of a harmonic force acting on particles inside viscous solid media, the system of particle vibration goes through a gradual transition from a static state to a steady harmonic vibrational state. Based on the damped oscillator model, the transition frequency spectrum resembles the intrinsic noise generated by vibrating particles in viscous isotropic solids, which delivers a crucial understanding for applications to invert stratum characteristics around the drilled oil well and its abnormal geological structure.

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Influence of viscosity on entropy noise generation through a nozzle

Cited by 8 publications

References 42 publications

Modeling of indirect combustion noise through a stator

Modeling of indirect combustion noise through a stator

Compositional noise in nozzles with dissipation

Understanding the physical mechanism of intrinsic noise inside viscous isotropic solids

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