Research On Structure Optimization Of Axial Fan Based On CFD

In modern large-scale livestock and poultry breeding,ventilation is an indispensable link,and the livestock and poultry house axial fan is an important equipment in this link.Improving its energy efficiency ratio and air volume performance will not only improve the environmental quality of the livestock and poultry house,but also Moreover,it is of great significance to reduce additional power consumption and improve economic efficiency.Based on this,this paper takes a 56-type livestock and poultry house axial fan as the research object,establishes a fan simulation model,and conducts a performance test on the wind tunnel platform to verify the accuracy of the numerical simulation.Numerical simulation methods are used to study the influence of main structural factors such as the length of the wind collecting tube,the opening and closing angle of the wind collecting tube,the angle of the impeller adjustment blade,and the radius of curvature of the deflector outlet on the internal and external performance of the fan.On the basis of the above research,the orthogonal test method is used to comprehensively analyze the various structural factors,and the parameter combination with better performance is obtained.Based on this,the axial flow fan is developed.The main content and conclusions of this article are as follows:（1）On the basis of blade reverse modeling,use Soild Works to establish a numerical simulation model of axial flow fan,take air volume and energy efficiency ratio as verification indicators,and use Computation Fluid Dynamics（CFD）for numerical simulation and experiment of axial flow fan verification.The results show that the simulated value of turbulence model SSTκ-ωis closer to the experimental value,and the average relative error between the simulated air volume and the experimental value is11.9%,and the average relative error between the simulated value and the experimental value of energy efficiency ratio is 12.7%,indicating that the simulated value It is in good agreement with the experimental value,and the selected turbulence model has high accuracy.（2）On the basis of numerical simulation,analyze the performance and flow field of the original axial flow fan,grasp its performance characteristics and flow field characteristics,and explore the factors affecting the performance of the fan.The results show that the main structural factors such as the fan impeller adjustment piece,the wind collecting tube and the deflector have a great influence on the performance and flow field characteristics of the fan.（3）Within the selected length of the wind tube,the air volume and energy efficiency ratio gradually increase with the increase of the wind tube length l.When it is greater than1100mm,the growth trend gradually slows down;in the selected wind tube opening and closing angle range In the interior,the air volume and energy efficiency ratio gradually decrease with the increase of the wind tube lengthβ.When it is greater than 23°,the decreasing trend gradually becomes gentle;within the selected radius of curvature of the outlet of the deflector,the air volume and energy efficiency ratio follow the guide The radius of curvature of the domeρincreases gradually.When it is greater than 190mm,the air volume and energy efficiency ratio both reach the peak value,and then decrease with the increase of the radius of curvature of the dome;within the angle range of the selected impeller adjustment blade,the air volume increases with the impeller.The adjustment blade angleαincreases,but the energy efficiency ratio decreases with the increase of the impeller adjusting blade angleα.（4）Through L₉（3⁴）orthogonal experiment and numerical simulation,it is found that when the length of the wind collecting tube is l=1200mm,the opening and closing angle of the wind collecting tubeβ=5°,the radius of curvature of the deflector outletρ=210mm,and the angle of the impeller adjusting blade Whenα=9°,the performance of the fan is the best,that is,the air volume and energy efficiency ratio are increased by 14.9%and 3.61%on average.Based on this,the axial flow fan was developed.After testing,the air volume and energy efficiency have increased by 8.55%and 8.48%on average compared with the original axial flow fan.This paper analyzes the flow field of the fan and explores the influence of different structural factors on the performance of the fan.It can provide a theoretical basis for the development and optimization of the axial fan in the livestock and poultry house in the future,and is of great significance to improving the environmental quality of the livestock and poultry house and reducing power consumption.