How to Control Noise from Standard Industrial Centrifugal Fans

How to Control Noise from Standard Industrial Centrifugal Fans

Given the noise hazards posed by industrial centrifugal fans in the manufacture of bricks and tiles, specialist manufacturers have conducted detailed research into noise control for these fans and analysed the situation based on actual conditions. Consequently, it is possible to identify the primary sources of noise and their propagation paths, implement effective countermeasures to reduce or block noise along these paths, and eliminate noise at the source. The aim is to minimise the noise pollution caused by industrial centrifugal fans in the environment, thereby improving the quality of people’s work and lives. To effectively control the flow of air through the blades of industrial centrifugal fans, three-dimensional blade designs and curved blades are suitable for specific types of industrial centrifugal fans. The blade configuration varies in various ways in both the circumferential direction and the meridional plane. The flow field structure of the duct affects different blades; the pressure gradient that blades can generate; the terminal angle region between the suction face and the leading edge; and the end region, which is primarily treated as a low-energy fluid zone. Currently, a five-hole probe is employed to measure the flow field in air using an industrial centrifugal fan with a trapezoidal cross-section; testing yields the actual distribution of internal airflow parameters. Preliminary analyses and results are currently being conducted, involving vortex design and the refinement of specific reference values. Furthermore, the dynamic response of centrifugal fan blades under unstable air loads is being investigated through three-dimensional simulation of the industrial centrifugal fan housing, alongside the spatial relationship between housing leakage and unstable flow fields. A comparison of experimental measurements of vortex amplitude with numerical calculations shows excellent agreement, indicating that this method can accurately simulate the dynamic response of vortex flow pressure. In recent years, research into airflow control has commenced, encompassing the identification of airborne noise, flow field analysis, prediction of noise fields, and a brief description of noise control sources, alongside theoretical studies and experimental work on industrial centrifugal fans.