| As one of the major coal-producing countries in the world, China is rich in coal resources. With the continuous development and improvement of technology, the mining depth and exploitation quantity of mining is gradually increased, and then more and more security problems follow. As one of natural disasters in coal mine, gas accidents are also the main source of accidents in heading face, resulted in heavy casualties, economic losses and negative social influence. As the ventilation power equipment of heading face, the safe and efficient operating of the fan is the important guarantee for the safety of mine workers. Therefore, the study of the performance of fan in heading face is of great significance for improving the reliability and reducing the accident.Based on a numbers of references, in accordance with the different transportation requirements of the heading face and the usage of the existing fans, the characteristics and types of local fans were compared and analyzed. In the case of satisfying the matching of fan performance and pipe network system, the different schemes to adjust fan performance were studied.In this paper, the performance test system of rotary fan was set up, and the related data were collected and processed. The performance curves of the fan were fitted by the generalized least square method. Based on the basic performance parameters and characteristic curves of contra-rotating fan, the fan performances under different operation schemes were compared. It is concluded that using single-stage impeller with dual-stage impeller in conjunction for wind is infeasible, and adopting frequency control technology can achieve ideal energy-saving results. Moreover, the causes of this phenomenon were analyzed by measuring the vibration and the noise of contra-rotating fan, and then the corresponding control methods were proposed.This paper choose FBD No8.0/2×55kW contra-rotating fan as the research object, and the three-dimensional model of the rotating fan collector, impeller, diffuser, hair dryer and other key parts were built by 3D modeling software Pro/E. Structural characteristics and existing problems of fan impeller were analyzed by the static strength calculation and modal analysis in FEM.The aerodynamic performance of NACA and LS airfoil was analyzed by the method of computational fluid dynamics, and the conclusion was drawn that the NACA airfoil is better than the LS airfoil by comparing the two kinds of characteristic curves of airfoil lift drag ratio and angle of attack. In order to explore the impact of NACA4415 airfoil blade of fan, the model of NACA4415 airfoil blade was established, and the fluid-structure interaction analysis and modal analysis of it was carried out in ABAQUS software. It is concluded that the performance of this fan blade airfoil is superior to LS airfoil on the aspect of optimization of the contra-rotating fan.In order to improve the energy efficiency of the fan, the drive scheme of a single drive rotary fan based on NACA airfoil blade was proposed, for the sake of the problems of poor heat dissipation and maintenance of the motor.In summary,this dissertation conducted a more in-depth research on the theories,simulation and experiments of the performance of contra-rotating fan in heading face. According to the different operation scheme of regulating the performance of rotary fan, the experiment was carried out, which provides a theoretical basis and technical support for further study of the rotary fan. |
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