旋转叶片电加热防冰系统设计与应用

在开展结冰试验时,结冰风洞风扇叶片前缘有结冰风险,影响风洞安全运行。针对大型旋转叶片结冰问题,提出了旋转叶片电加热防冰系统设计方法,研制了大型结冰风洞旋转叶片电加热防冰系统。首先,研制了内置电加热单元和温度反馈的防冰叶片。针对叶片复杂的工作环境,提出一种新的旋转叶片电加热防冰功率计算方法,通过精确测量和方案优化,设计了基于特殊环境的分半式、大尺寸、高线速度、碳刷自动移开/压紧的导电滑环。最后,采用变结构分级温度闭环和试验参数连锁防冰控制策略解决了旋转叶片结冰问题。该系统已应用于大型结冰风洞,运行中加热电流和叶片温度反馈信号传输连续,所有旋转叶片前缘快速加热且温度分布均匀,防冰效果好。

Design and Application of Electric Heating Anti-Icing System for Rotating Blades

The leading edge of blades may have icing risks under certain conditions in icing wind tunnels,which affects the safe operation of the test.In order to solve the icing problem of large-scale rotating blades,the design method of electric heating anti-icing system for rotating blades is proposed,and the electric heating anti-icing system for rotating blades of large-scale icing wind tunnel is developed.Firstly,the anti-icing blades with built-in electric heating unit and temperature feedback is developed.In view of the complicated working environment of blades,a new power calculation method of electric heating anti-icing for rotating blades is proposed.Through accurate measurement and scheme optimization,a conductive slip rings with half type,large size,high speed and automatic removal/compression of carbon brush based on special environment is designed.Finally,the variable-structure and hierarchical temperature closed-loop and experimental parameters interlocking anti-icing control strategy are used to solve the problem of rotating blade icing.The system has been applied in large-scale icing wind tunnel,and the heating current and blade temperature feedback signal are transmitted continuously in operation.All the leading edge of rotating blades heat up rapidly,and the temperature distribution is uniform,and the anti-icing effect is good.