Investigation of water lift station wind wheel blades

The article is devoted to improving the efficiency of water supply and watering animals in pastures and walking areas by optimizing the design and technological parameters of wind water stations. In the main studies of technologies and technical means the wind water stations are analysed and it is revealed that wind energy in mechanical installations (mills, water pumps) has been used for several centuries. It has been established that the actual direction of increasing the efficiency of water wind stations is to protect the blades from destruction by very strong gusts of wind. A vibration stand was used to test fatigue and crack resistance of turbine elements with a horizontal axis of rotation of the water station. The operating frequency range of the shaker was within 5‒5000 Hz, and the temperature values were −60…60 ºС (213…333 K). The influence of operational defects on fatigue was studied on materials of different classes: DIT aluminium alloy and VT6S titanium alloy. The characteristics of crack resistance and endurance of the material of the blades is determined at different temperatures and asymmetry load cycle. It has been established that lowering the temperature increases the resistance to the tedious destruction of experimental materials, so that these phenomena manifest themselves in different ways. The DIT alloy is more sensitive to the effects sub-zero temperatures, according to the characteristics of crack resistance, than VT6S. For VT6S alloys, a decrease in temperature from 60 °C to −60 °C leads to minor changes in the threshold stress intensity factors and crack growth rate, while for FIT the thresholds increase by 3...4 times, and the crack growth rate decreases by 1...2 orders. For VT6S alloys, there is a slight decrease in fracture toughness with decreasing the temperature, however, at high temperatures, the crack resistance values are at a high level and are several times higher than those of DIT.