高转速下原位加热系统理论设计

Theoretical Design of In-situ Heating System under the High-speed Spinning Condition

为了研发高转速叶片原位加热设备,基于目标温度为1000℃的设备性能指标要求,结合有限元仿真,系统研究了感应线圈形状及尺寸、感应线圈与叶片相对位置及间距、电流强度及频率等因素对试样温度分布的影响规律。结果表明:矩形感应线圈的加热效果优于圆形感应线圈,但差别不明显,且试样的温度分布基本一致;减小感应线圈与试样之间的距离可以显著提高加热温度,但会增加高速旋转试样与感应线圈发生摩碰的风险;增加电流及频率,试样最高加热温度快速上升,但进一步增加电流和频率,升温速率明显降低。综合分析后,根据设备研发的性能指标,确定感应加热系统的关键性能指标参数为:矩形线圈的尺寸为6 mm×8 mm,线圈与试样间距控制在3 mm~10 mm,电流频率控制在25 kHz~45 kHz.

In order to develop the equipment with the in-situ heating system for high rotating blades,the influence of the shape and size of the magnetic induction coil,the relative position and distance between the magnetic induction coil and the samples,current intensity and frequency on the temperature distribution of the samples are systematically studied using finite element simulation.The equipment has the ability to heat the samples to 1000 C.The results show that the heating efficiency of the rectangular induction coil is better than that of the circular induction coil,but the dfference in their heating efficiency is not obvious,and the temperature distribution on the sample is basically the same.Reducing the distance between the induction coil and the samples significantly increases the heating temperature and also increase the risk of the grinding collision between the high rotating samples and the induction coil because of the random vibration.By increasing current and frequency,the maximum temperature of the samples rises rapidly,but the rate of temperature increase significantly decreases with further increasing current and frequency.After comprehensive analysis,according to the requirements for maximum heating temperature of the samples not less than 100o C,the key performance parameters of the induction heating system are theoretically determined to be the rectangular induction coil with a dimension of 6 mm×8 mm,the distance between the induction coil and the samples within 3 mm~10 mm and the current frequency of 25kHz~45kHz.