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Aeroacoustic prediction for cooling fan using convolution quadrature boundary element method.

Xinzhong Gu1, Jia Yao1

  • 1School of Automotive Engineering, Changshu Institute of Technology, Changshu 215500, China.

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Summary

A new computational method accurately predicts aerodynamic noise from engine cooling fans by simulating fluid-blade interaction. This approach enhances understanding and prediction of aeroacoustic sound in engineering applications.

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Area of Science:

  • Aeroacoustics
  • Computational Fluid Dynamics (CFD)
  • Acoustics

Background:

  • Aerodynamic noise from engine cooling fans is a significant concern in engineering.
  • Predicting noise requires accurate simulation of fluid-flow and its acoustic consequences.
  • Existing methods may face challenges in computational efficiency and accuracy for complex interactions.

Purpose of the Study:

  • To develop and validate a computational method for predicting aeroacoustic sound.
  • To apply the method to aerodynamic noise radiation from engine cooling fans.
  • To assess the method's accuracy and computational efficiency compared to measurements.

Main Methods:

  • Flow field computation using the viscous vortex method with a simplified diffusion algorithm.
  • Noise source extraction in turbulent regions based on the vortex sound model.
  • Sound field determination using the Convolution Quadrature Boundary Element Method (CQBEM) and Fast Multipole Method (FMM) for efficiency.

Main Results:

  • Computed flow fields show good agreement with experimental measurements.
  • Predicted noise levels at microphone positions qualitatively match measured data.
  • The proposed method demonstrates effective prediction of fluid-blade interaction noise with improved computational efficiency.

Conclusions:

  • The developed computational method provides a viable tool for predicting aeroacoustic noise.
  • The integration of CQBEM and FMM offers an efficient approach for complex aeroacoustic problems.
  • The study validates the method's capability in simulating aerodynamic noise from engine cooling fans.