The hot-spot temperature of a dry-type air-core reactor is a crucial factor that determines the service life of the reactor. Although the environment elevation has a significant influence on the reactor’s heat dissipation performance and hot-spot temperature, studies seldom focus on the temperature distribution for different altitude scenarios. To this end, this paper proposes a temperature field simulation model with multi-parameter coupling constraints based on the laminar–turbulent flow state. The calculation of the temperature field with the hot-spot temperature at different altitudes is finally achieved. The simulation results show that the hot-spot is located at 6.3% from the top of the sixth encapsulated-winding. It also shows that the hot-spot temperature of the reactor increases by 5 K–11 K with the altitude ascending by 1 km. Moreover, the hot-spot temperature of the reactor exceeds the temperature index at an altitude of 3.25 km, which will result in a shortened service life. Fiber Bragg grating temperature sensors are embedded in encapsulated-windings to detect the temperature for verifying the validity of the temperature field model, which could provide critical temperature rise evaluation rules for the operation safety of the dry-type air-core reactor.

中文翻译：

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基于层流-湍流模型的干式空芯反应堆温度场数值模拟与检测

干式空心电抗器的热点温度是决定电抗器使用寿命的关键因素。尽管环境海拔对反应堆的散热性能和热点温度有重大影响，但研究很少关注于不同高度情景下的温度分布。为此，本文基于层流-湍流状态，提出了一个具有多参数耦合约束的温度场模拟模型。最终实现了在不同高度下利用热点温度进行温度场的计算。仿真结果表明，该热点位于第六个封装绕组顶部的6.3％处。它还表明，反应堆的热点温度随着高度上升1 km而增加5 K–11K。而且，反应堆的热点温度在3.25 km的高度处超过温度指数，这将导致使用寿命缩短。光纤布拉格光栅温度传感器嵌入包封的绕组中以检测温度，从而验证温度场模型的有效性，这可以为干式空心电抗器的运行安全性提供关键的温升评估规则。