Optimization Design For Skew And Sweep Parameters Of Mine Axial Fan Blades Based On Reverse Engineering

The skewed and swept blades of mine axial fan gradually become major mine ventilation equipment with the high efficiency, low noise and performance reliable characteristic in mine ventilation machinery. Therefore,in order to learn from these experiences in the optimization design. This paper uses reverse engineering technology to obtain these experience parameters. Thus, for better, faster to design a high quality fan blade to provide relevant reference. This paper utilizes reverse engineering technique, measurement technology, computational fluid dynamics (CFD), data processing technology and three-dimensional flow field analysis method to study mine axial fan optimization design method of skewed and swept blades. It is made great contribution to the proposition and development of the skewed and swept blades of mine axial fan design theory.(1) The blade shape of mine axial fan is the crucial influence factor on the aerodynamic performance of mine axial fan. In order to absorb and introduce the advanced design technology, reverse engineering was introduced to reconstruction the 3D geometrical model of mine axial fan blade. Firstly, according to the characteristics of the mine axial fan blade design planning measurement path and the point cloud data of 3D geometrical surfaces of mine axial fan blade were obtained through measuring with a three-coordinate measuring machine (CMM).Secondly, the point cloud data were processed by using UG a software of reverse engineering, including eliminated the abnormal points, the data smoothing and the data simplification of the point cloud. Finally, the non-uniform B-spline curve was introduced to fitting the date points of every cross section. The 3D geometrical model of mine axial fan blade was reconstructed through the method of the curve generating surface. It is of important significance to the direction the optimization design and computational fluid dynamics simulation of mine axial fan.(2) The computational fluid dynamics method was used to solve the three-dimensional flow. The effects of blades number and axial clearance on the aerodynamic performance of fan were studied. By increasing the two-stage blades, the total-pressure was enhanced and the efficiency of fan was increased at the beginning and decreased in the end. There was an optimal combination of two-stage blades. Under this condition the optimal aerodynamic performance of fan was obtained. In the optimal combination of two-stage blades condition, as the axial clearance increases, the friction losses of internal flow was improved, the total-pressure and efficiency were decreased. In contrast, the total-pressure and efficiency of fan, the aerodynamic noise and the blades vibration were enhanced with reduced the axial clearance.(3) The optimization design was studied using response surface methodology (RSM) and three-dimensional flow analysis for the mine contra-rotating axial fan two-stage blades. Firstly, the skew and sweep parameters of mine contra-rotating axial fan two-stage blades were defined. Secondly, the response surface model that between the skew, sweep of two-stage blades and total-pressure efficiency of fan was established with the skew and sweep of two-stage blades as the variables, the total-pressure efficiency of fan as the object. Finally, the skew and sweep parameters of two-stage blades were optimized.