Abstract
Considering the characteristics of narrow underground space and energy distribution, based on blade element momentum theory, Wilson optimization model and MATLAB programming calculation results, the torsion angle and chord length of wind turbine blade under the optimized conditions were obtained. Through coordinate transformation, the data were transformed into three-dimensional form. The three-dimensional model of the blade was constructed, and the horizontal axis wind turbine blade under the underground low wind speed environment was designed. The static structural analysis and modal analysis were carried out. Structural design, optimization calculation and aerodynamic analysis were carried out for three kinds of air ducts: external convex, internal concave and linear. The results show that the velocity distribution in the throat of linear air duct is relatively uniform and the growth rate is large, so it should be preferred. When the tunnel wind speed is 4.3 m/s and the rated speed is 224 rad/s, the maximum displacement of the blade is in the blade tip area and the maximum stress is at the blade root, which is not easy to resonate. The change rate of displacement, stress and strain of blade is positively correlated with speed. The energy of blade vibration is mainly concentrated in the swing vibration of the first and second modes. With the increase in vibration mode order, the amplitude and shape of the blade gradually transition to the coupling vibration of swing, swing and torsion. The stress and strain of the blade are lower than the allowable stress and strain of glass fiber reinforced plastics (FRP), and resonance is not easy to occur in the first two steps. The blade is generally safe and meets the design requirements.
Highlights
Coal resources are an important part of promoting China’s economic growth
The design wind speed at the front end of the blade is about 4.3 m/s. under the load of rated speed 224 rad/s, the cloud maps of displacement, stress and strain of the blade are shown in Figures 23–25 when the incoming wind is 4.3 m/s
The The data are transformed into three-dimensional model through coordinate transformation
Summary
Coal resources are an important part of promoting China’s economic growth. With the economic development, the demand for coal resources in industrial production is increasing. Since September 2020, three major coal mine accidents have occurred continuously in more than two months [1]. These accidents reflect that there are major omissions and problems in the implementation of government safety supervision and monitoring. As the first line of coal mining, underground working face is the area where underground workers work intensively, and the area where gas, roof, accidental combustion and other injury accidents occur frequently. If the safety management problems of working face and mining area can be overcome, the number of mine accidents and deaths can be greatly reduced and the underground safety production level can be greatly improved [2]
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