Mine Axial Flow Fans

Mine Axial Flow Fans

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Currently, mine axial flow fans operate by separating the high-pressure gas jet generated into the impeller, thereby weakening the secondary flow within the impeller. By utilizing the resulting reaction jet structure, it is possible to eliminate or mitigate the problem of dust accumulation in mine axial flow fans under partial load conditions. Through numerical simulations of mine axial flow fans, the fan pressure near the design point was optimized, improving efficiency after the impeller shroud was opened. When designing for flow rates to improve flow separation at the propeller outlet, the reduction in maximum velocity and velocity gradient at the propeller outlet weakens the jet structure at the fan outlet. Furthermore, the separation zone along the blade surface is reduced, and pressure increases more uniformly. This approach improves the performance of the closed-type mine axial flow fan and the overall unit under both design and low flow conditions. When combined with other control technologies that adapt to the boundary layer, the overall performance of the mine axial flow fan can be further enhanced. Based on three-dimensional inverse problem design methods and mechanical engineering techniques, this approach incorporates experimental responses from surface design and simulation algorithms for pin optimization. The 3D shape optimization design method optimizes propeller efficiency by integrating mine axial flow fan blades, refining design variables, and improving propeller efficiency and clearance based on response surface functions established between design variables. Experimental results indicate that the central input of the distribution ring has a significant impact on propeller efficiency, while the distribution of the edge ring exerts a notable influence on propeller efficiency. For optimization, we propose a numerical optimization design method for mining axial flow fans that minimizes structural vibration; the acoustic field calculation requires only the optimized results for structural vibration. This method can reduce the vibration of the vortex structure. Regarding the vortex structure before and after optimization, the Direct Boundary Element Method is used to calculate the vibration and noise of the vortex.