Blade force model for calculating the axial noise of fans with unevenly spaced blades

Wu, Yadong; Pan, Dinghao; Peng, Zhigang; Ouyang, Huajiang

doi:10.1016/j.apacoust.2018.11.008

Cited by 18 publications

(3 citation statements)

References 9 publications

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“…Developed a comprehensive Computational Fluid Dynamics (CFD) model to capture sound source information from cooling fans using Large Eddy Simulation (LES) in three different scenarios. Wu et al (Wu et al, 2019). Applied a blade splitting strategy to simulate a fan with uneven blade pitch.…”

Section: Introductionmentioning

confidence: 99%

Flow field analysis and noise characteristics of an automotive cooling fan at different speeds

Ren,

Zhang,

Zhang

et al. 2023

Front. Energy Res.

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As the core component of the automotive air conditioning cooling system, the automotive cooling fan directly affects the cooling performance of the entire system. Therefore, it is necessary to study the flow field and noise of the automotive cooling fan. This study focuses on the analysis off low field characteristics and noise generation in an automotive air conditioning systems, specifically related to an automobile cooling fan at different speeds. The flow field properties of the fan are examined through the distribution off low line trajectory, pressure distribution on the blade surface, and velocity distribution characteristics at various speeds. The analysis reveals that the maximum air velocity occurs at the point where the fan blade meets the wind guard, while the maximum pressure is observed at this point and at the edge where the fan blade cuts through the cavity. Furthermore, a monitoring point located 1 m in front of the fan is selected to study the average value of fan pneumatic noise pulsation and generate a noise cloud map, aiming to identify the main noise source of the fan. To better understand the noise distribution and variation at different speeds, various noise metrics are utilized, including noise Sound Pressure Level (SPL) spectrum, 1/3-octave SPL spectrum, and 1/3-octave A-weighted SPL spectrum. The noise characterization results indicate that the primary areas of fan noise generation are located at the tip of the leaf margin of the forward swept wing. This research provides valuable insights for the improvement and optimization of the cooling fan design, as well as subsequent noise reduction efforts.

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Section: Introductionmentioning

confidence: 99%

Flow field analysis and noise characteristics of an automotive cooling fan at different speeds

Ren,

Zhang,

Zhang

et al. 2023

Front. Energy Res.

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“…Jiang B et al [18] investigated the sinusoidal modulation method, stochastic modulation method, and associated constraints for unequal-pitch blades of a forward centrifugal fan to achieve lower pitch noise and good sound frequency distribution. Wu Y et al [19] developed a tonal noise prediction model based on the Lowson model and CFD simulation results, and the BPF noise of the axial fan optimized using this model was reduced by about 9.1 dB. Peng Z et al [20] developed a theoretical model to quickly predict and control the tonal noise of an automotive cooling fan, which can be used to effectively and quickly predict and control the tonal noise at an early stage of the automotive cooling fan module design.…”

Section: Introductionmentioning

confidence: 99%

Noise Reduction Design Method and Validation of Unequal-Pitch Blade Fan for Traction Motor

Li,

Yang,

et al. 2023

Processes

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The traction motor of trains is an essential component that generates the traction force, but it has a significant influence on the indoor and outdoor acoustic environment during the running condition. To enhance passenger comfort and bolster the environmental performance of trains, regulatory standards and specifications governing train noise have imposed elevated criteria on both tonal noise and the overall A-weighted sound pressure level emanating from traction motors. This paper proposes an aerodynamic noise optimization design method based on aerodynamic interference. The objective function of the optimization is defined as the blade-passing frequency (BPF) noise and the A-weighted overall sound pressure level of the traction motor fan. The simulated annealing algorithm is used to optimize the circumferential distribution of the blades. The optimized unevenly spaced blade configuration of the fan effectively reduces the BPF sound pressure level amplitude by 4.6 dBA and the overall A-weighted sound pressure level by 1.2 dBA. The calculation results agree well with the experimental results. The study reveals that unevenly spaced blades contribute to better noise reduction at lower rotational speeds. However, the effect diminishes at higher speeds. The relationship between noise reduction and blade count is nonlinear, suggesting an optimal count for specific speeds.

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“…Wu used CFD simulations to study the transient characteristics of blade forces in fans with uneven blade spacing. Based on this, a "[T] -h" model for predicting blade forces was developed, and then a prediction based on simulation results and CFD research was developed based on the Lowson model [11]. David evaluated the performance of these underground fan systems in four different deep gold mines in South Africa.…”

Section: Introductionmentioning

confidence: 99%

Application of Gray Relational Analysis and Computational Fluid Dynamics to the Statistical Techniques of Product Designs

Lin

Cheng²,

Chen

2020

Symmetry

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During the development of fan products, designers often encounter gray areas when creating new designs. Without clear design goals, development efficiency is usually reduced, and fans are the best solution for studying symmetry or asymmetry. Therefore, fan designers need to figure out an optimization approach that can simplify the fan development process and reduce associated costs. This study provides a new statistical approach using gray relational analysis (GRA) to analyze and optimize the parameters of a particular fan design. During the research, it was found that the single fan uses an asymmetry concept with a single blade as the design, while the operation of double fans is a symmetry concept. The results indicated that the proposed mechanical operations could enhance the variety of product designs and reduce costs. Moreover, this approach can relieve designers from unnecessary effort during the development process and also effectively reduce the product development time.

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Blade force model for calculating the axial noise of fans with unevenly spaced blades

Cited by 18 publications

References 9 publications

Flow field analysis and noise characteristics of an automotive cooling fan at different speeds

Flow field analysis and noise characteristics of an automotive cooling fan at different speeds

Noise Reduction Design Method and Validation of Unequal-Pitch Blade Fan for Traction Motor

Application of Gray Relational Analysis and Computational Fluid Dynamics to the Statistical Techniques of Product Designs

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