Generally, the outlet speed of the fan is relatively high, accounting for a large part of the total pressure of the fan, so the loss of the diffuser must be accurately calculated to meet the requirements of the fan pressure design. In practice, the common calculation method is to control the equivalent diffusion angle of the diffuser at 8O ~ 12O, and calculate by assuming the efficiency of the diffuser. However, this method has many limitations and must be improved.
It is assumed that the diffuser can be equivalent to a conical diffuser, and then the friction flow loss and diffusion loss in the conical diffuser can be calculated according to the change of hydraulic diameter, and on this basis, the better diffusion angle of the diffuser of high-pressure fan can be calculated, thus obtaining a relatively accurate calculation structure.
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