How to deal with the loud noise of axial flow fans?
Release time:
2021-08-12
Author: Polluted Soil
Link: https://www.zhihu.com/question/313208002/answer/609008419
Source: Zhihu
Copyright belongs to the author. For commercial reproduction, please contact the author for authorization; for non-commercial reproduction, please indicate the source.
Axial flow fans are widely used fans, typically employed in scenarios with high flow requirements and low pressure requirements. They mainly consist of a fan impeller and casing, featuring a simple structure but high data requirements. Axial flow fans also generate noise during operation, which is primarily of a dipole nature. Noise control for axial flow fans is also very important, and the current control methods mainly include:
1. In terms of aerodynamic performance, efforts should be made to minimize airflow impact and boundary layer separation phenomena to avoid or reduce the occurrence of impact noise and vortex noise. During design, sharp protrusions and abrupt turns in the flow section should be avoided.
2. Utilizing the principle of acoustic impedance mismatch, design and install silencers at the intake and exhaust ports of the axial flow fan to minimize the sound radiation noise from the intake and exhaust ports, effectively reducing noise.
3. Setting up sound-absorbing panels at the outlet of the axial flow fan can effectively reduce noise levels.
4. Establishing soundproof rooms (spaces) to prevent or reduce the propagation of axial flow fan noise by placing the fan in a soundproof room with sound-absorbing properties.
5. Modifying the blades, the most common method being perforation of the blades. This method can reduce vortex noise and allow the air resistance to pass through effectively. Typically, the perforation method is used on the working wheel blades because vortex separation often occurs at the blade outlet. By using the perforation method, some airflow can pass from the high-pressure side of the blade to the low-pressure side, promoting the movement of the blade separation point downward, thus reducing the separation area at the blade outlet and achieving a noticeable reduction in noise.
The above are some solutions provided by Jingzhiyuan for the issue of high noise from axial flow fans. I hope this is helpful to you. For specific situations, please consult a professional company.
Previous
Previous
Related News
Tel: 0510-87601805
E-mail: shenhong@zt-fan.com
Address: No. 2, Wendong East Road, Industrial Concentration Zone, Xushe Town, Yixing City, Jiangsu Province (No. 58, Original East Road)
Scan QR code
Plus WeChat
Copyright © 2024 Jiangsu ZT Fan Co., Ltd. Business License
