Abstract
On the basis of small axial fan with five blades, 6 types of small axial flow fans with different chord lengths splitter blades were designed. Numerical simulation of 6 fan models with splitter blades and prototype fan were done by using Fluent. Based on the obtained simulation results, internal flow characteristics and aerodynamic noise were analyzed and compared. It indicates that: splitter blades with suitable chord length have improved significantly on internal flow characteristics, which inhibits backflow from pressure surface to the suction surface at blade tip and leading edge and restrains flow separation. The 6 model fans are better than prototype fan on aerodynamic noise improvement, but too long or too short chord lengths are both disadvantage to improve aerodynamic noise. The results reveal that 2/6, 3/6 and 4/6 chord length model have relatively better acoustic characteristics and internal flow characteristics. The research program will offer a reference for structural improvements and noise reduction on small axial flow fan.
Highlights
In daily production and life, fans are widely used in industrial fields, such as aerospace, chemicals, wind power generation and so on
Many studies on small axial fan have been done, Lin and Tsai conduct research on small axial fans and establish an excellent system that is a fusion of aerodynamics, noise and electro-mechanical assessment program, which could be used as an important tool for fan designers [1]
Based on the above performance curve, it reveals that: (1) an appropriate chord length of splitter blades has a notable effect on enhancing the static characteristics of small axial fan, especially in high-flux operating point; (2) too long or too short chord length are detrimental to performance improvement, and the rough range from 2/6 chord length to the 4/6 chord length is optimum condition
Summary
In daily production and life, fans are widely used in industrial fields, such as aerospace, chemicals, wind power generation and so on. Many scholars have conducted research on the blow performance, aerodynamic noise and internal flow field of. Cai and Luo conduct numerical simulation of centrifugal impeller flow field, analyze two main variables (number of blades and applying Long-short blade structure). It denotes that a reasonable number of blades can reduce the secondary flows, and applying Long-short blade structure is effective to improve the fluid flow [6]. Based on different chord lengths of splitter blades, 6 types of small axial fan models with splitter blades are designed, and static characteristics, internal flow characteristics and aerodynamic noise are analyzed
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