Abstract:  Aiming at the problems of unstable flow field and large pressure loss in FBD No. 8.0mine counter rotating axial flow fan, the geometric parameters of collector and fairing in the fan were optimized. First, the inlet diameter, length of the collector and the two horizontal lengths of the fairing were selected as the orthogonal test factors, and the total pressure efficiency was the evaluation index of the test to explore the influence on the aerodynamic performance of the fan under the joint action of the collector and the fairing. Then, according to the orthogonal test table of L9 (34), nine test schemes were designed and numerically calculated. Finally, through the range analysis method, the primary and secondary influence order of geometric parameters on fan efficiency was obtained, and the optimal combination of size parameters was determined. The results show that comparing with the prototype fan, the total pressure and efficiency of the optimized fan are respectively increased by 2.64% and 1.74% at the flow point of 750m3/min. Under the full flow condition, the total pressure and efficiency are increased by 2.12% and 2.31% on average. The optimized fan can effectively alleviate the vortex phenomenon at the inlet, reduce the pressure difference inside the front end of the air duct and improve the air inlet; the vorticity on the blade surface is reduced and the fan performance is improved.

Key words:  counter-rotating axial flow fan; aerodynamic performance;structural dimension parameters; orthogonal test;current collector; fairing

WANG Zi-hao, KOU Zi-ming, GAO Gui-jun, et al. Influence of structural dimension parameters on aerodynamic performance of counter-rotating axial flow fan［J］.Journal of Mechanical & Electrical Engineering, 2022,39(2):269-275.