“…Xu et al [1] Groove width, groove depth, groove center distance, groove number, different groove shapes CFD simulation design method Ye et al [2] Inner diameter, bevel-cutting blade CFD technology, test Li et al [3] Vortex characteristics CFD technology Wei et al [4] Clearance, the inclination angle, the volute tongue CFD technology, test Zhou et al [5][6][7] Multi-blade centrifugal fan blade airfoil parameter The scroll cut-off angle, the scroll diffuser expansion angle, the diameter ratio of the impeller, the blade exit angle The main research methods for rotating machinery are based on CFD and the surrogate model. For example, among the above literature about multi-blade centrifugal fans, references [1][2][3]11] are based on CFD research and references [5][6][7]12] are based on CFD and surrogate model research.…”