Design Of Impeller Structure And Aerodynamic Performance Of KJS-Y Dust-fall Fan

KJS-Y dust-fall fan is a dust-removal equipment,which is mostly used in the working environment of driving face,mining face and belt conveyor transfer point under the mine.The dust-fall fan is designed based on axial-flow fan and a large number of engineering application foundations.From the field application effect,there are many problems to be improved,such as poor reliability of impeller structure,short service life and so on,which need to be solved.In order to improve the working performance of the dust-fall fan,the geometrical structure of the impeller is calculated theoretically,the calculation model and the key parameters of the impeller are simulated based on computational fluid dynamics(CFD).Through limited experimental conditions,the influence of the impeller parameters and the optimized impeller on the dust-removal performance is discussed respectively.The main contents of this paper are as follows:(1)Aerodynamic parameters of impeller and airflow parameters of each section of blade are designed theoretically by means of isolated airfoil design method and variable loop design method;proper connection mode of impeller and wheel hub is selected and the impeller is modeled in three dimensions by combining the calculated impeller structure dimensions.(2)The fluent module in ANSYS is used to simulate the dust-removal process and analyze the velocity and pressure distribution of flow field inside the dust-fall fan during the dust-removal process.Through the simulation results,the comparison and analysis between the calculation model and the initial model are carried out,and the performance indexes of the calculation model are significantly improved.(3)Single-factor simulation test is carried out to determine each factor level of impeller parameters(hub ratio,number of blades,installation angle of blades,chord length of blades,twist angle of blades and tip clearance).Based on the orthogonal test of each parameter,a comprehensive index judging formula for dust-removal performance of dust-fall fan is put forward and the influencing order of each parameter of impeller is:number of blades>installation angle>chord length of blades>tip clearance>hub Ratio>twist angle of blades,and through regression analysis and parameter optimization,the actual optimum impeller parameter combination is obtained,which verifies that the actual optimum scheme improves 38.9%over the comprehensive performance parameters of the initial impeller model.The comparison of simulation results for four kinds of blades(radial blade,forward-bending blade,forward-swept blade and swept blade)shows that the swept blade can effectively improve the inside performance.Flow condition of airflow in the upper part.(4)Based on field experimental conditions,the influence of impeller speed,number of vanes and blade installation angle on the inlet wind speed of the collector is analyzed,and the comparison between the initial impeller and the optimized impeller is carried out.The experimental results show that the wind speed of the optimized impeller is 28.6%higher than that of the original impeller.This paper combines theory,simulation and experiment to study the influence of impeller structure on dust removal performance of KJS-Y dust-fall fan.The research results enrich the theoretical content of dust-fall fan impeller and have certain reference significance for improving the development level of dust-fall fan impeller and dust-removal performance.Figure[54]table[23]reference[90]...