Volute profile design method under profile sizing limitation

Abstract

The invention discloses a volute profile design method under profile sizing limitation, which specifically comprises the following steps: performing size limitation on a volute profile, and convertingXY rectangular coordinates of the profile into angle-distance coordinates; determining a maximum size value; setting seven control points; calculating a node vector based on the non-uniform B splinecurve, establishing a primary function, and obtaining points on a volute profile in an angle-distance form through the primary function and seven control points; drawing a volute profile; performing numerical simulation on q groups of sample points corresponding to different optimization variables to obtain the aerodynamic performance of the fan; and finally, establishing an approximation model, and solving an optimal Pareto solution. The volute structure is improved by conducting non-uniform B-spline curve fitting on the structure of the volute molded line, especially the distance between thepoint on the volute molded line and the center of the impeller, the molded line of the volute is locally adjusted by adjusting the coordinates of the control point, the volute molded line can be locally adjusted to meet the engineering requirements, and the performance is improved.

Description

technical field [0001] The invention belongs to the field of centrifugal fans, and more specifically relates to a method for designing a volute profile under the limitation of a fixed shape and size, which is suitable for the volute profile of a centrifugal fan, and the volute is especially a multi-wing centrifugal fan volute with size limitations. Shell, especially suitable for range hoods. Background technique [0002] In household appliances, due to the limitation of size and space, especially in the design of range hoods, the size is developing toward smaller size, so that the volute of the multi-blade centrifugal fan is cut to meet the requirements of the small internal space of the range hood. At present, the volutes on the market are all cut in a straight line, and the cross-sectional area of ​​the volute undergoes a mutation process of first becoming smaller and then larger, so that the gas flowing out of the impeller flows and separates seriously at this cutting pos...

AI Technical Summary

Problems solved by technology

In the design of multi-blade centrifugal fan with the above design method, the designed volute size is often too large, which does not meet the size requirements of the space.

In engineering applications, the design requirements are achieved by adjusting the local profile of the volute, but the direction and size of the adjustment must be determined according to actual experience, which is often time-consuming and laborious, and the profile of each section of the volute must be satisfied during the adjustment process The smoothness between them increases the difficulty of the volute profile design

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