A Research On Calculation And Optimization Method For Noise Control In An Axial Fan Of CPU Cooler Of PC

The basic parameters of axial fan impeller, such as boss ratio, blade angle, skewed-swept angle of blade and chord length, and the distance between fan frame and heat sink etc. obviously influence the thermal conductivity, acoustic noise and sound quality. This paper presents Synergistic Design Method for CPU cooler consisting of axial fan and heat sink based on second Orthogonal Experimental Design. In order to obtain optimized solution, to drive first orthogonal experimental design based on 7 potential factors influencing thermal conductivity and acoustic noise, and obtain 3 key factors to drive second orthogonal experimental design.In this research, model of full calculating zone is created, generating about 1,500,000 mixed meshes of Tetra and Hexa in order to obtain better precision. Based on the simulation and measurement results, statistics method is used to analyze the data and the marginal means is obtained to create the regression table. At the same time, the correlation matrix of the thermal conductivity and acoustic noise is created and the correlations of the estimation parameters between the thermal conductivity and acoustic noise, including correlation between the thermal conductivity and acoustic noise, are presented.Finally, the universal significance results based on the correlation analysis are obtained. There is distinct negative correlation between the thermal conductivity and flowrate through the upper section of heat sink. That means the thermal conductivity will be higher when the flowrate is on larger magnitude.?There is distinct correlation between sound pressure level and difference of total pressure of out columnar section and inner columnar section. There is distinct correlation between sound pressure level and total pressure per unit length. That means the sound pressure level will be higher when the difference of total pressure or the total pressure per unit length is on higher level. For modulation, the recommendations are the blade angle of hub and tip both on larger magnitude, but the skewed-swept angle of blade on 0 degree. For prominence ratio, the recommendations are the blade angle of hub on smaller magnitude, the blade angle of tip on larger magnitude, but the skewed-swept angle of blade on negative magnitude. These universal significance results are useful for similar product research and development.