Research On Ultrasonic Wave Anti-Icing And De-Icing Theory And Technology For Wind Turbine Blades

Wind turbine operating in the clammy region, icing is one of the main factors which impacts the safety and reliability of wind turbines.ice appeared on the blades surface reduce the efficiency and output power of wind turbine. Severe icing results in wind turbines unplanned downtime, affecting the security and stability of power system.Since there is no mature de-icing technology for wind turbine, a new de-icing method for wind turbine blades based on ultrasonic wave is proposed in this dissertation. The de-icing mechanism of ultrasonic wave for iced blades is explored, and the quantitative relationship between interface shear concentration coefficients (ISCC) and input power has been deduced. By establishing the piezoelectric-structure coupled characteristics calculation model, the optimal de-icing frequencies under the different install intervals of transducers have been obtained, which coincides with the experimental results well. Research results show that the ultrasonic de-icing technology for wind turbine blades is effective.The mechanism and influence factor of icing on blades were studied in this paper.According to the characteristics of iced blades, physical model of cleaning and icing blades were created in the Solidworks software.with the aid of FEA software ANSYS,the first five natural frequencies and vibration models were calculated under the condition of stationary, rotation and different thickness iced,the dynamic characteristics of blades influenced by speed and ice were gotten,blade icing condition detection theoretical was provided by these studies.The physical model of ice blades that had been established were used,coupling filed calculation was done on iced blades,the node stress at ice-substrate interface were gained,compared to ice maximum adhesion stress 0.4MPa,optimal de-icing frequency and transducer install intervals for wind turbine blades were obtained. The optimal de-icing frequency 93.1kHz, transducer install intervals 12mm were suggested based on this dissertation.On the fundamental of theoretical research, 6 sets prototype ultrasonic anti-icing, de-icing were developed. The atmospheric icing environment was simulated in the artificial environment laboratory,impact factor on blade icing were monitored under different meteorological conditions,the relationship curves about ice thickness, temperature,humidity and time were gained. At the same time, using the self-developed ultrasonic de-icing device perpetrated the substrates de-icing experiments,taking the experimentation results and numerical results compared,the feasibility of ultrasonic de-icing technology applied in the practical were verified.