Flow behavior and aerodynamic noise characteristics of ultra-high-speed elevator based on large eddy simulation

Zhang, X.; Jing, Hao; Zhang, Qing; Zhang, Ruijun; Liu, Lixin

doi:10.1108/ec-12-2021-0736

Cited by 5 publications

(1 citation statement)

References 30 publications

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“…Complex boundary layer flow patterns, such as vortices of different scales, are further formed there and interact with turbulence to generate intense fluctuating pressure, eventually transforming into aerodynamic noise. 4 The elevator car is one of the main aerodynamic sound-generating components, the most crucial factor leading to rapid and severe deterioration of the acoustic environment in the hoistway. Therefore, studying the evolution behavior of vortex structures and aeroacoustic characteristics of the elevator car in unsteady flow fields is crucial.…”

Section: Introductionmentioning

confidence: 99%

Analysis of vortex structures evolution and aeroacoustic characteristics in the ultra-high-speed elevator ring-gap flow field

Zhang,

Li,

Zhang

et al. 2023

International Journal of Aeroacoustics

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The continuous improvement of elevator speed has made the issue of aerodynamic noise in the hoistway more prominent. Previous research has usually focused on the characteristics of aerodynamic loads and related safety issues, and little attention has been paid to the problem of flow-induced noise. This paper established a three-dimensional geometric configuration of the ultra-high-speed elevator to study the flow behavior and aerodynamic acoustic characteristics in the hoistway using well-validated large eddy simulations. Firstly, we analyzed the unsteady flow behavior in the ring-gap flow field using large eddy simulations and captured the transient vortex structure in the flow field using the Q-criterion. We then predicted the far-field aerodynamic noise of the elevator car using the Lighthill-Curle aerodynamic acoustic equations. The results showed that the factors affecting the sound source intensity of the elevator car include the shedding position and intensity of the vortex structures. By adjusting the shedding position and reducing the intensity of the vortex structure, the sound source intensity of the elevator car wall could be effectively controlled. The change of the blocking ratio could not affect the attenuation of aerodynamic noise in the hoistway, but the increase of the blocking ratio could lead to an increase in the turbulent kinetic energy intensity and peak SPL in the hoistway. Therefore, the blocking ratio should be kept within 0.65 when designing the hoistway structure dimensions.

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Section: Introductionmentioning

confidence: 99%

Analysis of vortex structures evolution and aeroacoustic characteristics in the ultra-high-speed elevator ring-gap flow field

Zhang,

Li,

Zhang

et al. 2023

International Journal of Aeroacoustics

Self Cite

View full text Add to dashboard Cite

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Numerical Simulation and Experimental Study of Noise Reduction of Bladeless Fan Based on Acoustic Metamaterials

Wu,

Chen,

Zhang

et al. 2023

Acoust Aust

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Theoretical modeling and multi-parameter influence analysis of piston wind in the ultra-high-speed elevator hoistway

Liu,

Zhang,

Zhang

et al. 2023

Physics of Fluids

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The high-speed airflow generated when an ultra-high-speed elevator runs in the hoistway will cause a significant piston effect. Therefore, it is essential to study the variation law of the piston wind in the hoistway and the influence of different parameters on the piston wind in the hoistway. This paper first establishes the theoretical model of the piston wind in the hoistway when the elevator ascends, descends, and intersects based on the unsteady flow theory of the Bernoulli principle. The effectiveness and accuracy of the theoretical model are verified through experimental measurements and numerical simulations. Second, based on the verified theoretical model, the influence of the five parameters of the car speed, car height, hoistway height, blockage ratio, and frictional resistance coefficient on the variation law of the piston wind and ventilation rate in the hoistway is systematically analyzed. Integrating the five parameters, a multi-parameter universal theoretical formula for hoistway ventilation rate is proposed. Finally, a gray correlation analysis is performed on each influencing parameter, which showed that the piston wind in the elevator hoistway is most affected by the blockage ratio, followed by the car speed, hoistway height, and frictional resistance coefficient, and is least affected by the car height.

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Flow behavior and aerodynamic noise characteristics of ultra-high-speed elevator based on large eddy simulation

Cited by 5 publications

References 30 publications

Analysis of vortex structures evolution and aeroacoustic characteristics in the ultra-high-speed elevator ring-gap flow field

Analysis of vortex structures evolution and aeroacoustic characteristics in the ultra-high-speed elevator ring-gap flow field

Numerical Simulation and Experimental Study of Noise Reduction of Bladeless Fan Based on Acoustic Metamaterials

Theoretical modeling and multi-parameter influence analysis of piston wind in the ultra-high-speed elevator hoistway

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