Aerodynamic noise prediction of a high-speed centrifugal fan considering impeller-eccentric effect

Ren, Ke-Xin; Shuai, Zhi-Jun; Wang, Xi; Jian, Jie; Yu, Tao; Dong, Lieyi; Li, Wanyou; Jiang, Chenxing

doi:10.1080/19942060.2022.2042392

Cited by 8 publications

(2 citation statements)

References 48 publications

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“…Liu et al 16 merged deep neural networks and genetic algorithms to predict axial fan performance.Jin et al 17 applied the Sobol method to optimize large axial fan exit guide vanes, significantly reducing fan noise. Safikhani et al 18 employed polynomial neural networks to enhance centrifugal pump design, validated through experiments and CFD simulations.Ren et al 19 analyzed centrifugal fan aerodynamic noise via the DES/FEM method, providing effective numerical simulation for actual conditions.…”

Section: Introductionmentioning

confidence: 99%

The multi-objective optimisation design of outlet guide vanes of diagonal flow fan based on sobol sensitivity analysis

Mao,

Luo,

Zhou

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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Diagonal flow fans offer substantial energy-saving potential and find broad application across various sectors. Their performance relies heavily on factors like outlet guide vanes and spacing relative to moving blades. However, research into enhancing fan performance through optimized guide vanes and spacing remains limited. In this study, we focus on improving the accuracy of predicting the internal flow field of diagonal flow fans. This paper incorporate rotation and curvature effects using the Large Eddy Simulation (LES) model and introduce stress terms with helicity constraints to create a non-linear subgrid-scale model. This refined model enables more precise numerical simulations. By employing accurate simulations, we optimize the outlet guide vane configuration and conduct sensitivity analysis. We utilize a Radial Basis Function (RBF) model coupled with the Sobol method for this purpose. The optimized guide vane design exhibits enhanced resistance to airflow separation compared to the original, resulting in notable reductions in flow losses within the grille channel. Experimental tests are performed on the diagonal flow fan both before and after optimization. At the specified operating point, the second guide vane optimization leads to a 1.28 m3/min increase in fan flow, a 4.33% rise in total pressure efficiency, and a 2.2 dB noise reduction. These findings underscore the accuracy of the helicity correction model in predicting diagonal flow fan behavior. The multi-objective optimization approach, combining the RBF proxy model with the Sobol method, proves highly reliable. It offers valuable design insights for similar fans and establishes a credible design methodology.

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Section: Introductionmentioning

confidence: 99%

The multi-objective optimisation design of outlet guide vanes of diagonal flow fan based on sobol sensitivity analysis

Mao,

Luo,

Zhou

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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show abstract

“…The noise of gas turbines has always been one of the important problems in the improvement of gas turbines. The noise of gas turbines is mainly the highfrequency aerodynamic noise caused by the gas flowing [2] and the low-frequency mechanical noise caused by mechanical vibration. Mechanical noise is the radiation result of mechanical vibrations in the air containing important information about the operating status of gas turbines, such as rotational speed, amplitude, etc.…”

Section: Introductionmentioning

confidence: 99%

Convolutive blind source separation in the frequency domain of mechanical noise for gas turbines based on bounded component analysis

Cheng¹,

Chen²,

Song³

et al. 2022

Meas. Sci. Technol.

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Noise source identification of gas turbines can provide basis and guidance for vibration and noise reduction of gas turbines. Independent component analysis (ICA) which is one of the most popular techniques of blind source separation (BSS) widely used in vibration and noise sources of mechanical systems. However, ICA is suitable for independent source signals. In order to identify dependent mechanical noise sources of gas turbines, a convolutive blind source separation in frequency domain based on bounded component analysis (BCA) is proposed. First, the basic theory of BSS and BCA is introduced in detail. The convolutive mixing in time domain is transformed into an instantaneous mixing in frequency domain by STFT, and complex BCA is performed at each frequency bin. Then a permutation alignment method based on local and global optimization is proposed to solve the problem of the fuzziness of permutation. Finally, the accuracy and robustness of the proposed method are studied and compared through typical numerical studies and experimental studies on a three-rotor experimental bench. The results show that the proposed method can effectively separate and identify independent and dependent source signals.

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Mechanism of the rotor−stator interaction in a centrifugal pump with guided vanes based on dynamic mode decomposition

Shuai

Wang

et al. 2022

Physics of Fluids

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In this paper, the mechanism of rotor-stator interaction in a centrifugal pump with guide vanes is studied numerically and theoretically. The dynamic mode decomposition method is employed to decouple and reconstruct the unsteady flow. A diametrical mode theory suitable for centrifugal pumps with guided vanes is proposed to determine the source of harmonics with higher amplitudes quickly. The results show that the dominant frequencies of the pressure pulsation in the volute and guide vanes are the blade passing frequency and its harmonic frequencies, and the corresponding flow structure is stable and has higher modal energy. The rotor-stator interaction effect around the impeller outlet is most pronounced. The potential flow effect works on the impeller and guide vanes but decays rapidly. The pressure pulsation caused by the wake effect propagates downstream and persists for long distances, which is the main reason for forming the modal pressure field in the volute. The modal reconstruction can reproduce the dynamic evolution process of the pressure field at the characteristic frequencies. The propagation characteristics of the modal pressure field in the volute can be accurately predicted by theoretical analysis. This research can provide an essential reference for fault diagnosis and vibration control of the centrifugal pump.

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Aerodynamic noise prediction of a high-speed centrifugal fan considering impeller-eccentric effect

Cited by 8 publications

References 48 publications

The multi-objective optimisation design of outlet guide vanes of diagonal flow fan based on sobol sensitivity analysis

The multi-objective optimisation design of outlet guide vanes of diagonal flow fan based on sobol sensitivity analysis

Convolutive blind source separation in the frequency domain of mechanical noise for gas turbines based on bounded component analysis

Mechanism of the rotor−stator interaction in a centrifugal pump with guided vanes based on dynamic mode decomposition

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