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[PDF] Top 20 Accounting for complex flow-acoustic interactions in a 3D thermo-acoustic Helmholtz solver

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Accounting for complex flow-acoustic interactions in a 3D thermo-acoustic Helmholtz solver

Accounting for complex flow-acoustic interactions in a 3D thermo-acoustic Helmholtz solver

... Abstract in English Environmental concerns have motivated turbine engine manufacturers to create new com- bustor designs with reduced fuel consumption and pollutant ...to a mechanism known as combustion ... Voir le document complet

222

Accounting for Acoustic Damping in a Helmholtz Solver

Accounting for Acoustic Damping in a Helmholtz Solver

... Swirler In the diaphragm configuration, the flow was laminar and fairly simple: the only complexity was the shear layer created at the downstream lips of the ...6b) for which there is no theoretical ... Voir le document complet

18

Thermo-acoustic Instablilities

Thermo-acoustic Instablilities

... obtained for sector 1. is provided by the use of a 3D Helmholtz ...chamber in a non reactive flow is ...have a strong influence on the acoustics of the azimuthal ... Voir le document complet

50

An analytical model for azimuthal thermo-acoustic modes in annular chamber fed by an annular plenum

An analytical model for azimuthal thermo-acoustic modes in annular chamber fed by an annular plenum

... conducted in Section ...described in Section 4 with simplistic shapes to construct coupling factors and study azimuthal modes for a case where a plenum is connected to a chamber ... Voir le document complet

47

Accounting for mean flow effects in a zero-Mach number thermo-acoustic solver:  application to entropy induced combustion instabilities

Accounting for mean flow effects in a zero-Mach number thermo-acoustic solver: application to entropy induced combustion instabilities

... complex amplitude of acoustic wave constant of sub-grid scale Smagorinsky model constant of sub-grid scale Sigma model heat capacity at constant volume heat capacity at constant pressure[r] ... Voir le document complet

156

Accounting for Acoustic Damping in a Helmholtz Solver

Accounting for Acoustic Damping in a Helmholtz Solver

... Swirler In the diaphragm configuration, the flow was laminar and fairly simple: the only complexity was the shear layer created at the downstream lips of the ...6b) for which there is no theoretical ... Voir le document complet

17

Soot modelling in flames and Large-Eddy Simulation of thermo-acoustic instabilities

Soot modelling in flames and Large-Eddy Simulation of thermo-acoustic instabilities

... CASE FOR OP1 97 Limit-cycle of the thermo-acoustic instability Once the flame starts to oscillate, the amplitude of the oscillations grows in time until a steady-state oscillatory ... Voir le document complet

159

A New Implementation of the Extended Helmholtz Resonator Acoustic Liner Impedance Model in Time Domain CAA

A New Implementation of the Extended Helmholtz Resonator Acoustic Liner Impedance Model in Time Domain CAA

... as a multiple of the time-step 1 , 4 or to ...consists in “treating the duct and the liner backing air cavity as two different domains which interact with each other through novel boundary conditions ... Voir le document complet

15

A non-local pedestrian flow model accounting for anisotropic interactions and domain boundaries

A non-local pedestrian flow model accounting for anisotropic interactions and domain boundaries

... pedestrian flow model proposed in ...L´ecureux-Mercier. A class of nonlocal models for pedestrian ...account for anisotropic interactions and the presence of walls or other ... Voir le document complet

21

Aerodynamic and acoustic evidence for the articulations of complex nasal consonants

Aerodynamic and acoustic evidence for the articulations of complex nasal consonants

... hear in their phonological ...stops in this language. These observations are a first step in this ...direction. A third important reason is that it provides an example of clicks (that ... Voir le document complet

32

Mixed finite element discretizations of acoustic Helmholtz problems with high wavenumbers

Mixed finite element discretizations of acoustic Helmholtz problems with high wavenumbers

... way. For the velocity formulation, we set ∇p h = u h , and p h = −(1/k 2 )∇ · u h ...simulations for the incoming wave p i = exp(ikd · x) with d = (cos(π/12), sin(π/12)) for different wavenumbers k ... Voir le document complet

21

Thermo-acoustic instabilities driven by fuel droplet lifetime oscillations

Thermo-acoustic instabilities driven by fuel droplet lifetime oscillations

... to acoustic disturbances leads to large heat release rate ...to a motion of the combustion volume boundary. A series of analytical expressions have been derived for the fluctuations of the ... Voir le document complet

10

Sensitivity analysis of thermo-acoustic eigenproblems with adjoint methods

Sensitivity analysis of thermo-acoustic eigenproblems with adjoint methods

... by a classical Monte Carlo analysis. Note that in order to define the active variables, W, the active subspace method detects which directions (or linear combination of directions) in the parameter ... Voir le document complet

11

Soft 3D acoustic metamaterial with negative index

Soft 3D acoustic metamaterial with negative index

... For all operating frequencies f 0 , the amplitude of the transmitted pulses decreases when the propagation distance z is increased in such a passive medium, as illustrated at 140 kHz (Fig. 2a). ... Voir le document complet

13

Monitoring gas hydrate formation and transport in a flow loop with acoustic emission

Monitoring gas hydrate formation and transport in a flow loop with acoustic emission

... The flow is induced by a multiphase pump (Moineau pump), with a flow rate between 72 ...The flow rate is monitored with a Coriolis flow-meter equipped with a ...The ... Voir le document complet

10

Multi-modal acoustic-photo-acoustic imaging for small animal imaging

Multi-modal acoustic-photo-acoustic imaging for small animal imaging

... Publisher’s version / Version de l'éditeur: Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été ... Voir le document complet

4

Stability analysis of thermo-acoustic nonlinear eigenproblems in annular combustors. Part I. Sensitivity

Stability analysis of thermo-acoustic nonlinear eigenproblems in annular combustors. Part I. Sensitivity

... . In struc- tural mechanics, the calculation of first- and second-order derivatives of non-degenerate eigensolutions of self-adjoint nonlinear eigenproblems was proposed in aeroelasticity by Mantegazza and ... Voir le document complet

17

Characterization of a robot arm for use in acoustic experiments

Characterization of a robot arm for use in acoustic experiments

... 4.2 Software Implementation The current software has not yet been integrated. It consists of two separate prgram that run independently. The first program (called rb360.m) controls the robot arm via the first USB port to ... Voir le document complet

51

Acoustic waves in combustion devices : interactions with flames and boundary conditions

Acoustic waves in combustion devices : interactions with flames and boundary conditions

... only a few milliseconds of physical time can be simulated. In this context, Urbano et ...used a “bomb-test-like” triggering technique in order to excite the acoustic ...an ... Voir le document complet

207

Acoustic voxels

Acoustic voxels

... Modular Acoustic Filter 4.1 Primitive Resonator We propose to use a simple shape as our primitive resonator—a hollow cube with extruded cylinders on its six faces (Figure ...form a ... Voir le document complet

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