What are the methods for noise control of centrifugal fans

About noise control of centrifugal fans:

At present, through the harmfulness of the noise generated by the centrifugal fan that is commonly used in the ceramic industry, and describes the measures to be taken to control the detailed noise, the analysis of the noise and the research of the centrifugal fan are carried out. The main source of noise and its propagation path are determined, and effective measures to control noise are taken to achieve weakening or cutting of the path of propagation noise or eliminate noise sources.

Since the performance characteristics of a centrifugal fan are closely related to its internal flow field structure, in some simplified models, the numerical simulation of a given part of the fan cannot accurately reflect the interaction between the volute and the impeller. To understand the root cause of performance changes, and to optimize fan performance to improve system characteristics, it is necessary to analyze the structure of the entire machine flow field in detail. In the software data module, using the function method, the numerical value of the centrifugal fan at different operating points, the design speed of the simulation is faster than the existing experimental data.

Therefore, the interaction fan between design and performance optimization is provided, a reliable theoretical basis, finite element software is used to simulate the flow field of the centrifugal fan, and the results of the numerical simulation are provided. The parametric design method is used to quickly obtain the performance parameters of the fan under various geometric parameters, and optimize the design. Because the internal dimensional equation field of the centrifugal fan is unstable, the turbulence model is simulated at different relative positions, and the pressure distribution is different at different times when the turbine analysis performance flows out.

At the same time, it shows that instantaneous improvement of performance, the tongue of the fan blade and volute, is a new way to improve the overall performance of the centrifugal fan in a specific relative position at a specific time. In addition, the three-dimensional numerical simulation of the centrifugal fan is carried out directly from the static pressure changes in the unresolved area of ??unsteady flow. On this basis, the least square method is used to optimize the fan impeller parameters, and numerical simulation is used to verify the optimization results.

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