How to Optimize the Performance of Axial-Flow Mine Fans

How to Optimize the Performance of Axial-Flow Mine Fans

A new type of axial-flow mine fan was simulated. According to the experimental results, high entropy generation and turbulent dissipation in the impeller are the primary causes of entropy generation in the fan. Entropy generation due to viscous dissipation is negligible. Impeller parameters were optimized using optimization theory, and the entropy generation and dynamic characteristics of the axial-flow mine fan were analyzed before and after optimization. Experimental results indicate that optimizing the impeller and convective entropy reduces the entropy generation rate, thereby improving all pressure increments across the efficiency range of the axial-flow mine fan. Based on the increase in total pressure, the design parameters of the power generation unit driving the fan near the high-efficiency point were optimized. A comprehensive three-dimensional numerical simulation of the flow field was performed using the finite volume method and new software for axial-flow mine fans. Experimental results show that low-energy fluid flows toward the axial vortex region, approaching the low-pressure surface to drive the static and dynamic pressures at the blade and impeller inlets, as well as the dynamic pressure. The rotational flow exhibits a convex distribution. Currently, efficiency and noise tests for axial-flow mine fans are conducted using various inlet designs, including small-hole dust collectors and simple baffle-type axial-flow mine fans. Performance tests indicate that the inlet type features a box-type structure. This design offers more rational and superior airflow performance. Compared to the inlet slot of axial-flow mine fans, two adjustable deflators can regulate energy, while the Akiba deflator exhibits better adjustment performance. Experimental results show that the noise level of axial-flow mine fans has been reduced while improving efficiency and performance. By applying a smooth-edge wavelet harmonic spectrum, the attenuation characteristics of the time-domain wavelet harmonic algorithm can be improved, and an implementation method is provided. In the experimental study of the rotating shroud of an axial-flow mine fan, the dynamic pressure measurement profiles of the signals differ; the improved time-frequency wavelet analysis of harmonic frequencies reveals that the energy interruption phenomenon at the openings of several centrifugal fans with different diffusers is weaker.