Noise generation in vane axial fans due to rotating stall and surge

Čudina, Mirko

doi:10.1243/0954406011520517

Cited by 16 publications

(12 citation statements)

References 11 publications

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“…The contribution of the self-noise that is described by the rotor-locked mode is also enhanced. Future simulations could also focus on off-design phenomena such as rotating instabilities [41] or rotating stall [42]. For instance Crevel et al already simulated one-eighth of the full CREATE 3.5-stage research compressor installed at Ecole Centrale de Lyon including the upstream settling chamber and the downstream collector [43].…”

Section: Resultsmentioning

confidence: 99%

Turbomachinery Noise Predictions: Present and Future

Moreau

2019

Acoustics

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In future Ultra-High By-Pass Ratio turboengines, the turbomachinery noise (fan and turbine stages mainly) is expected to increase significantly. A review of analytical models and numerical methods to yield both tonal and broadband contributions of such noise sources is presented. The former rely on hybrid methods coupling gust response over very thin flat plates of finite chord length, either isolated or in cascade, and acoustic analogies in free-field and in a duct. The latter yields tonal noise with unsteady Reynolds-Averaged Navier–Stokes (u-RANS) simulations, and broadband noise with Large Eddy Simulations (LES). The analytical models are shown to provide good and fast first sound estimates at pre-design stages, and to easily separate the different noise sources. The u-RANS simulations are now able to give accurate estimates of tonal noise of the most complex asymmetric, heterogeneous fan-Outlet Guiding Vane (OGV) configurations. Wall-modeled LES on rescaled stage configurations have now been achieved on all components: a low-pressure compressor stage, a transonic high-pressure turbine stage and a fan-OGV configuration with good overall sound power level predictions for the latter. In this case, hybrid Lattice–Boltzmann/very large-eddy simulations also appear to be an excellent alternative to yield both contributions accurately at once.

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Section: Resultsmentioning

confidence: 99%

Turbomachinery Noise Predictions: Present and Future

Moreau

2019

Acoustics

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“…Shen et al [8] and Jang et al [9] analysed the vibration of a spinning flexible disc-spindle system supported by bearings. For mechanical devices that involve a disc and an auxiliary system in relative rotation, such as car disc brakes, Ouyang and Mottershed [10] and Kang et al [11] investigated the dynamic stability of a rotating disc excited by a frictional load. Recently, Ouyang [12] presented numerical results of a refined dynamic model for the vibration of atomizing discs.…”

Section: Introductionmentioning

confidence: 99%

Modal interactions in a rotating flexible disc

Pei

Tan

2008

Proceedings of the Institution of Mechanical Engineers, Part C:

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This article presents a dynamic investigation on the modal interactions in a rotating flexible disc. The governing equation of the rotating flexible disc is modelled by both considering the disc as a von Kármán plate and including the initial transverse runout of the disc. When the equation is discretized by Galerkin's method, non-diagonal elements of the stiffness matrix induced by the centrifugal force of the rotating disc, which represent the modal interactions, remain. Effects of the modal interactions on natural frequency and total deflection of the disc are investigated. The investigation shows that neglecting the modal interactions should cause evident error in the dynamic analysis of rotating flexible discs. The modal interaction results in the initial transverse runout of a given mode not only affects the deflection of the mode itself but also causes the deflection of other modes with different numbers of nodal circles and becomes stronger with an increase in the disc rotating speed and the number of nodal circles.

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“…This instability is a consequence of rotating stall, which is described in detail in Cudina. 28,29 For this case, the periodical unsteady flow happens with the steady conditions of the inlet and outlet, which leads to the variation of the forces acting on the wall. An excessively large force will cause the vibration of the walls and the rotors, which may result in the destruction of the structure, so this periodical oscillation should be paid more attention for the dynamic analysis of the rotating ramjet system.…”

Section: Numerical Simulation and Analysismentioning

confidence: 99%

Nonlinear dynamic characteristics of rotating ramjet rotor supported by hybrid gas bearing

Zhang

Liu

Kang

et al. 2012

Proceedings of the Institution of Mechanical Engineers, Part G:

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The nonlinear dynamic characteristics of rotating ramjet rotor supported by hybrid gas bearing are studied. The compression inlet flow field at different back pressure levels is analyzed and the normal working back pressure level is determined. The periodic movement phenomenon of normal shock wave in compression inlet is presented. The influence on the compression inlet flow field with the variation of structure dimension is introduced. Then, the nonlinear compression inlet flow force generated from the whirling of the rotor is obtained. The model for the rotating ramjet rotor supported by the hybrid gas bearing is established by the finite element method. The equation of motion for the rotating ramjet rotor is numerically solved and coupled with the gas lubricated Reynolds equation considering the time terms. The vibration characteristics of the rotating ramjet with different supply pressure and unbalanced mass eccentricities are solved by the Newmark method. The orbit trajectory diagram, frequency spectrum diagram, and time response diagram are obtained. Then, the stability of the rotating ramjet rotor system is discussed. The results indicate that the compression inlet is under the condition of high adverse pressure gradient, the shock wave, expansion wave, reflections and crossings of the shock waves, boundary layer–shock wave interference, and separation of the flow, which lead to the unstable flow of the compression inlet. The nonlinear compression inlet flow force can cause sub-synchronous vibration. If the supply pressure and eccentricities are properly designed, the vibration amplitudes can be decreased and the stability will be improved, which will make the foundation for the vibration control of the rotating ramjet system.

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Noise generation in vane axial fans due to rotating stall and surge

Cited by 16 publications

References 11 publications

Turbomachinery Noise Predictions: Present and Future

Turbomachinery Noise Predictions: Present and Future

Modal interactions in a rotating flexible disc

Nonlinear dynamic characteristics of rotating ramjet rotor supported by hybrid gas bearing

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