| Under the direction of bionic Fluid idea ,depend on the analysisand the summary of traditional fan's reducing noise technology,a newmethod is put forward-bionic reducing noise technology,and is used tocontrol the noise specification when design an axial flow fan as wellas to distinguish the main factor of noise generation.The method is based on the theory of birds'quiet flying,add thesawtooth on the vane's dege and make some adaptation ,apply on reducingnoise technology of axial flow fan,to some degree we can accept theeffect.First analyse related data,from the date we can find the primereason of night owl's quiet flying------micro sawtooth of the backedge'wing. Through optimal design,we can analyse and draw therelation between the rate of the reducing noise and the factors.The method is not dependent on large-sized softwareof the numericalsimulation method,and it meet the needs of controlling the noise inengineering.And it also avoids the difficuty of too much computationwork and too complex programming in computed aerodynamicacoustics(CCA)method.It is a good balance between the trueness and thetechnicality. Because the limitation of technical level,it is notpractical to develop the bionic low noise fan with current specializedknowledge and experiment condition.. This thesis includes 7 chapters. Chapter 1 is introduction, whichmainly introduces the damage of noise and the general situation ofbionic fluid mechanics, and explains the aim and significance of thisresearch work. Chapter 2 introduces relevance theory of flowfan.Chapter 3 search noise elimination mechanism of the typical animal,and design model of bionic unsmooth fan. Chapter 4 make experiment tobionic unsmooth fan and select the best. Chapter 5 analyses thecharacter of phonics wind rate and efficiency , obtained curves such... |
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