Investigation on Vortex Shedding Noise by Wall Bounded Cylinder
The paper has an investigation on vortex shedding noise by wall bounded cylinder through acoustic wind tunnel and numerical simulation.In wind tunnel test,the diameter of the cylinder is 10mm,15mm,20mm,the gap between lower cylinder edge and wall is from 1mm to 7mm with interval of 2mm,free stream velocity is from 30m/s to 60m/s with interval of 10m/s,the ratio of gap to diameter(G/D)is from 0.05 to 0.7.Combined with numerical simulation results and wind tunnel results,three conclusions can be found according to different G/D ratio.Firstly,when G/D<0.1,periodic vortex shedding phenomenon and tonal noise by cylinder are completely suppressed.Secondly,when 0.1<G/D<0.3,periodic vortex shedding phenomenon is still disturbed by wall surface effect,moreover,the intensity and frequency of the tone is still lower than that measure from free cylinder flow around.Finally,when G/D>0.3,the disturbs to periodic vortex shedding phenomenon by wall surface effect is negligible and the tone is also similar to that measured from free cylindrical flow.
wall boundedcylindervortex shedding noisegap to diameterwind tunnel testnumerical simulation
NETL
NSTL
万方数据
