In the aerodynamic design of centrifugal fans, it is generally considered that the working conditions corresponding to the design flow are the best conditions. The best operating point of many centrifugal fans is the aerodynamic design using deviated flow design, and the direction and size deviation of operation It is related to the specific speed. After analyzing the reason, the different selection of specific speed is because the design process proposed by the user is different. The performance state variable work can be predicted and optimized to ensure that the performance with good design conditions provides user efficiency.
Obviously, the performance of variable working conditions is improved. The new type of centrifugal fan is the subject of investigation. The dynamics technology is used to simulate the aerodynamic characteristics of the fan volute, the generation and evolution of vortex and the mechanism of vortex noise are analyzed, and two types of cylinders are added. The simulation results of the vortex-shaped and conical cylinders and the installation of the anti-vortex ring proved that the aerodynamic characteristics of the fan volute were significantly improved, and the large-scale vortex was effectively destroyed. The noise and spectrum experiments after adding the anti-vortex ring proved this.

At present, centrifugal fans are widely used in agricultural production. The impeller is one of the main components of the fan, which has a great impact on the performance of the fan. In this study, the impeller of the centrifugal fan wheat thresher is used as the research object, and the fan is used The three-dimensional model of the impeller is imported into the finite element analysis software of the format for static analysis and modal analysis. The application in the grain harvester is a small threshing and grain blower, which has a certain reference to the design of a double outlet air duct cleaning device value.

Due to factors such as processing technology and production cost, two-dimensional blades are still widely used in centrifugal fans. The relative speed of the air flow in the impeller makes the change of air flow relatively stable. According to the design requirements during the flow period, the average flow rate along the line is controlled in order to improve the design quality , The design of the blade profile that can be connected to the rotating surface, so that the two can meet the needs of distribution control, and the paper loading can be calculated as a reference when modifying the distribution.