The Acoustical Behavior of Contra-Rotating Fan
Joint Authors
Source
Mathematical Problems in Engineering
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-8, 8 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-04-01
Country of Publication
Egypt
No. of Pages
8
Main Subjects
Abstract EN
The noise produced by a contra-rotating ventilator can cause injury to humans.
Therefore, it is important to reduce noise caused by ventilators.
In this study, the Ffowcs Williams and Hawkings (FW-H) model was used to simulate the acoustics of four different axial impeller spacing points based on the unsteady flow field through a FBD No.
8.0 contra-rotating ventilator.
Experiments were conducted to verify the correctness of the numerical model.
Meanwhile, the Variable Frequency Drive (VFD) drives the two motors of 55 kW to give the impellers different speeds to distinguish different conditions.
The results showed that the main noise source of the ventilator was the two rotating impellers and the area between them.
For the same axial space, the noise decreased with the increase of flow rate and then decreased.
And the amplitude of the discrete pulse increased gradually.
It can be concluded that the vortex acoustics decreased gradually with the increase of flow rate and the rotating acoustics were the major contributor.
With the axial distance increasing, the noise caused by the two impellers was weak, and the frequencies of sound pressure level moved toward medium- and low-frequency bands gradually.
The suitable axial space could reduce noise and improve the working environment.
American Psychological Association (APA)
Wu, Juan& Kou, Ziming& Liu, Jing. 2018. The Acoustical Behavior of Contra-Rotating Fan. Mathematical Problems in Engineering،Vol. 2018, no. 2018, pp.1-8.
https://search.emarefa.net/detail/BIM-1207073
Modern Language Association (MLA)
Wu, Juan…[et al.]. The Acoustical Behavior of Contra-Rotating Fan. Mathematical Problems in Engineering No. 2018 (2018), pp.1-8.
https://search.emarefa.net/detail/BIM-1207073
American Medical Association (AMA)
Wu, Juan& Kou, Ziming& Liu, Jing. The Acoustical Behavior of Contra-Rotating Fan. Mathematical Problems in Engineering. 2018. Vol. 2018, no. 2018, pp.1-8.
https://search.emarefa.net/detail/BIM-1207073
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1207073