Effects of bionic blades inspired by the butterfly wing on the aerodynamic performance and noise of the axial flow fan used in air conditioner

Tian, Chenye; Liu, Xiaomin; Wang, Jiahao; Xi, Guang

doi:10.1016/j.ijrefrig.2022.04.018

Cited by 13 publications

(9 citation statements)

References 17 publications

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“…The fundamental principle involves designing low-noise devices based on the structural characteristics observed in nature, offering innovative solutions for aerodynamic noise control. In the context of bionic noise reduction designs for axial fans, Tian et al [29] designed fan blades with concave outer edges, inspired by the effective control of airflow exhibited by butterfly wings. The optimized axial fan demonstrated a 1% reduction in power consumption and a 1.3 dB decrease in noise.…”

Section: Introductionmentioning

confidence: 99%

Bionic noise reduction design of axial fan impeller

Sun,

Li,

Wang

et al. 2024

J. Phys. D: Appl. Phys.

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Fans are integral equipment widely employed in both industrial settings and daily life. However, a persistent challenge in their design lies in the inherent conflict between aerodynamic performance and noise levels. Improving aerodynamic efficiency often results in a compromise of acoustic performance. To tackle this issue, we employed the bionic design method to craft a novel axial fan impeller featuring a bionic curved hub and bionic serrated leading edges. The impact of structural optimization on the aerodynamic and acoustic properties of the impeller, as well as the influence of optimization parameters on these properties, were systematically investigated through numerical simulations. The bionic impeller was then fabricated using 3D printing, and its aerodynamic and noise performance were experimentally evaluated by integrating it into an external air conditioner. Comparison of the flow field and sound field data between the optimized and prototype impellers revealed noteworthy outcomes. The curved wall at the bionic hub's tail effectively diminished the pressure gradient on the hub surface, directing the airflow toward the rear end of the hub. This design enhancement significantly reduced the turbulent area behind the prototype impeller's hub. Additionally, the bionic serrated structure, when appropriately designed, demonstrated its efficacy in reducing the contact area between the blade's leading edge and incoming flow. This led to the dispersion of stress concentrations and the inhibition of strong turbulence generation. Notably, the experimental results indicated a 3.7% increase in air volume flow rate and a 2.3dB reduction in noise for the optimized impeller compared to the prototype. This successful mitigation of the trade-off between aerodynamic performance and noise level underscores the effectiveness of our bionic design approach.

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Section: Introductionmentioning

confidence: 99%

Bionic noise reduction design of axial fan impeller

Sun,

Li,

Wang

et al. 2024

J. Phys. D: Appl. Phys.

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“…7 Heo et al 8 innovatively shaped the trailing edge of a centrifugal fan blade into an inclined s-shape to create a low-noise centrifugal fan. Inspired by the efficient airflow control of butterfly wings, Tian et al 9 redesigned an axial fan with a concave outer edge profile. They analyzed the internal flow mechanism of the bionic-bladed axial fan through simulations and experiments, revealing the noise reduction mechanism of the concave structure.…”

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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“…Cattanei A,et al [4] studied the influence of blade spacing on the performance of axial flow fans. Tian C et al [5] designed bionic blades to reduce the power consumption and aerodynamic noise of axial flow fans, which had a positive impact on the improvement of aerodynamic performance and noise reduction of axial flow fans in experiments. Based on the CFD simulation method, this paper conducted a comparative experiment on structure layout, studied the influence of motor layout on the performance of the company's new G100S axial flow fan, and explored ways to improve the performance of the axial flow fan.…”

Section: Introductionmentioning

confidence: 99%

G100S axial flow fan simulation comparison analysis

Li¹,

Chen²,

Yang³

et al. 2022

J. Phys.: Conf. Ser.

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This paper conducts a comparative simulation for different structural layout schemes of the new G100S axial flow fan, with the motor layout position and its supporting guide vane as the main modification direction, while the fan length and guide tongue angle are appropriately adjusted according to the motor position. CFD analysis and calculation are used to compare and study the performance of the axial-flow fan. The results show that the axial flow fan with rear motor, air outlet cone integration, and large angle guide tongue layout has greater wind speed, longer injection distance, more uniform distribution of outlet flow field traces, greater wind pressure at the air outlet, and faster flow stability convergence. This work will provide technical support for designing orthogonal experiments in the direction of fan miniaturization and lightweight.

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Effects of bionic blades inspired by the butterfly wing on the aerodynamic performance and noise of the axial flow fan used in air conditioner

Cited by 13 publications

References 17 publications

Bionic noise reduction design of axial fan impeller

Bionic noise reduction design of axial fan impeller

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

G100S axial flow fan simulation comparison analysis

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