The development of two small high performance single stage diagonal fans is described. The design objectives and constraints are discussed and the aero-/acoustic performance of the new fan is compared to an existing diagonal fan. For the aerodynamic design, the maximum flow coefficient and the maximum pressure coefficient at stall are prescribed together with geometrical constraints on outer diameter and axial space. The aerodesign is carried out using a through-flow method and 3D CFD. Two design variants are presented, a design with guide vanes for pressure recovery and a variant with struts optimized for low noise. The numerical predictions are compared to experimental data. The agreement between the predicted performance and the experimental data is sufficient for design purposes. Compared to the existing diagonal fan, the new fan shows significant improvements in terms of efficiency, performance and noise without compromising versatility and overall dimensions.

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