Numerical Study on Aeroacoustics Behaviour of Contra-Rotating Fans

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
  
© 2021 by IJETT Journal
Volume-69 Issue-8
Year of Publication : 2021
Authors : Bukhari Manshoor, Chia I Shin, Djamal Hissein Didane, Amir Khalid, Muhammed Abdelfattah Sayed Abdelaal
  10.14445/22315381/IJETT-V69I8P214

MLA 

MLA Style: Bukhari Manshoor, Chia I Shin, Djamal Hissein Didane, Amir Khalid, Muhammed Abdelfattah Sayed Abdelaal  "Numerical Study on Aeroacoustics Behaviour of Contra-Rotating Fans" International Journal of Engineering Trends and Technology 69.8(2021):109-116. 

APA Style: Bukhari Manshoor, Chia I Shin, Djamal Hissein Didane, Amir Khalid, Muhammed Abdelfattah Sayed Abdelaal. Numerical Study on Aeroacoustics Behaviour of Contra-Rotating Fans International Journal of Engineering Trends and Technology, 69(8),109-116.

Abstract
The contra-rotating fan produces noise that can affect human health. Therefore, it is important to reduce the noise that is generated by the contra-rotating fan. In this research, the airflow performance and acoustic behaviour of the contra-rotating fan will be studied. The objectives of this study are to perform the simulations for the flow generation by the contra-rotating fans, furthermore, investigate the effect of the different spacing between the two propellers on the noise generation. The ANSYS Fluent with the RNG K-ε model was used to simulate the steady flow field of the fan, while Ffowcs Williams and Hawkings (FW-H) model was used to simulate the acoustic of the fan set. The simulation results show that the main source of the noise was from the fan propellers. The performance of the contra-rotating fan increases when the rotating speed of the propellers increases. However, it will also increase the noise. For the effect of distance between the two propellers, the noise generated by the contra-rotating fan decreases with the increase of the distance between the propellers. It can be concluded that with the suitable distance between the two propellers and rotating speed, the fan could function more efficiently while producing less noise.

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Keywords
Aeroacoustic, Airflow, Contra-rotating fan, Noise, Sound pressure