The impeller is the core pneumatic component of the fan, and the internal flow of the impeller directly determines the performance and efficiency of the whole machine. Therefore, domestic and foreign scholars have done a lot of work in order to understand the real flow conditions inside the impeller and improve the impeller design to improve the performance and efficiency of the impeller.
The impeller is the core pneumatic component of the fan, and the internal flow of the impeller directly determines the performance and efficiency of the whole machine. Therefore, domestic and foreign scholars have done a lot of work in order to understand the real flow conditions inside the impeller and improve the impeller design to improve the performance and efficiency of the impeller. In order to design a highly efficient centrifugal impeller, researchers have studied the flow of gas in the impeller from various angles and sought the best method of impeller design. The earliest use is the one-dimensional design method. Through a large amount of statistical data and certain theoretical analysis, the selection rules of the aerodynamic and structural parameters of each key section of the centrifugal fan are obtained.
In the initial stage of the unary method, the key parameters of the centrifugal impeller and the volute can be determined simply by calculating the average speed of each critical section of the Reitz centrifugal fan, and the general blade profile is formed by a simple single arc. This method is very rough, and the performance of the designed Reitz centrifugal fan requires a lot of experience from the designer. Sometimes a good performance fan can be obtained, but in most cases, the designed fan is inefficient.
In order to improve, the researchers designed the concept of the flow cross section of the radial section of the impeller wheel cover. The wheel cap of the centrifugal impeller thus designed is two or more arcs. The impeller designed by this method is better than the previous one. The efficiency of the one-dimensional design method is slightly improved, but the fan wheel cover designed by the method is difficult to process and costly, and is difficult to be used for the production of large and non-standard fans.
Another important aspect is to improve the design of the centrifugal fan blades of the Reitz. The improvement methods for the binary blades are mainly the equal deceleration method and the equal expansion method, and the method of using the relative velocity in the given impeller along the average streamline. The deceleration method considers the loss from the point of view of the loss, and the relative velocity of the airflow changes uniformly at the same rate in the flow path of the impeller, which can reduce the flow loss and improve the efficiency of the impeller. The method of expansion is to avoid the excessive expansion angle of the local area. And the proposed method. The distribution of the relative velocity in the impeller along the average streamline is controlled by the law of the relative average flow velocity along the streamline. The distribution of the blade profile along the radius can be obtained by a simple geometric relationship.
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Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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