Effects of axial gap on contra-rotating mine fan＇s performance
Abstract：Aimed at reference to guide the axial gap selection,unsteady numerical simulations were carried out on contra-rotating mine fans with seven different axial gaps by Large Eddy Simulation（LES）.For the rated condition,variations of the fan＇s aeroacoustic performance,rotor safety and aerodynamic performance caused by the axial gap were investigated.The aeroacoustic performance and rotor safety are improved as the axial gap grows,but over the axial gaps of 80% and 60%～70% of the first mean span chord（b） respectively,their variation tendencies slow down,so it＇s meaningless to lengthen the axial gap any more;at the axial gap of 55% to 60% of b,optimum aerodynamic performance is observed,in which inlet flow angle of the 2nd rotor and mixing between wake and main flow are two main influencing factors.Results show that favorable over-all properties appear in the fan with axial gap of about 70% of b.
Keywords：contra-rotating mine fanaxial gapperformanceLarge Eddy Simulation
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)