关键词: 小型轴流风扇, 内部流场, 出口管道流场, 涡流

Abstract: The study on small axial flow fan is carried out based on its flow field. Through numerical simulation of fan VD8025 using software Fluent and analysis of its internal and external flow fields, conclusions are drawn as follows：Separation vortex induced by boundary separation on blade suction side（non-working side） exists; blade tip vortex caused by secondary flow on blade pressure（working side） occurs; limited blade height inducing double vortex is being along axial. Above vortexes are illuminated by quantitative analysis on fan’s internal velocity distribution. Derived from quantitative analysis on fan’s outlet velocity distribution, the location away from fan’s outlet 120 mm is the best one for the fan ventilation.

Key words: small axial flow fan, internal flow field, external tube flow field, vortex