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The method as presented here is limited to single-curved, non-airfoil shaped blades (circular arc or logarithmic spiral blades). Those simple shapes are frequently used in centrifugal fan design. The design of more complex 3D shaped blades can be found, for example, in Pfleiderer [1].
The impeller is a double-width, double-inlet (DWDI) centrifugal type with two nonstaggered blade rows. Each impeller blade row has backward-swept blades mounted between a common back plate and shrouds. In order to effectively manage the craft fuel consumption, a reduction in fan’s operating power is necessary.
This paper applied the modified Hicks-Henne function to the optimal design of centrifugal fan blades used in buildings, and verifies the feasibility of coupling the modified Hicks-Henne function and multi-objective genetic algorithm to the blade parametric design.
The present effort utilized a numerical optimization with experiential steering techniques to redesign the fan blades, inlet duct, and shroud of the impeller. The resulting flow path modifications not only met the pressure requirement, but also reduced the fan power by 8.8% over the baseline.
A multi-stage optimization with preliminary design and shape optimization has been conducted to improve the aerodynamic performance of a centrifugal fan system. In preliminary design phase, classical blade design theory and Archimedean spiral were adopted for blade and casing, respectively.
This study examines the inverse design problem (IDP) of determining the optimal three-dimensional shape of a centrifugal-flow fan based on a desired airflow rate. The desired volume airflow rate can be obtained by multiplying the airflow rate of an existing fan by a
The design process for the students begins by applying the Euler Turbomachine Equation and using velocity triangles to determine the inlet and exit blade angles for the impeller, and then adding the blades to a template of the impeller hub provided by the instructor in the 3-D computer aided design (CAD) program Solidworks® 1 as shown in Figure 1a.
The method as presented here is limited to single-curved, non-airfoil shaped blades (circular arc or logarithmic spiral blades). Those simple shapes are frequently used in centrifugal fan design. The design of more complex 3D shaped blades can be found, for example, in Peiderer [1].
The three types of centrifugal fan blades – radial, backward and forward – give three characteristic performances. Table 18-24B gives a quick comparison.
At the design working point, the air volume of the multi-blade centrifugal fan increases by 1.4 m3/min; at the same time, the total pressure efficiency increases by 3.1%, and the noise is reduced by 1.12 dB, applying the proposed design.