碳纤维石墨化专用微波矩形槽波导谐振腔的设计及数值模拟

微波作为一种碳纤维石墨化过程中的加热方式，对于实现碳纤维在径向和周向上的均匀石墨化具有潜在优势。由于电磁波在腔体内传递时能量分布有很大的不均匀性，首先针对微波加热腔体的形状和尺寸进行了设计；随后采用Ansys Electronics软件建立了加热碳纤维丝束的电磁加热-热辐射-流动传热模型，模拟了腔体内的电磁场和温度场；最后分析了走丝速度与保护气体流速对于腔内温度场分布的影响，结果表明：保护气体流速对加热过程中丝束能达到的最高温度影响较大，而走丝速度对最高温度的变化基本没有影响。本文研究对于碳纤维微波石墨化加热腔的研制具有较实际的指导意义。

Design and numerical simulation of a microwave rectangular waveguide resonant cavity for carbon fiber graphitization

Microwaves have strong penetrability, and can heat objects in bulk, so that each part of the material can be heated more uniformly. Using microwave as a heating method during the graphitization of carbon fibers has potential advantages for achieving uniform graphitization of carbon fibers in the radial and circumferential directions. Taking account of the large non-uniformity of the energy distribution when electromagnetic waves are transmitted in a conventional cavity, we have attempted to optimize the shape and size of the microwave heating cavity. An electromagnetic heating-heat radiation-flow model for heating the carbon fiber tow was established using Ansys Electronics software. A heat transfer model was used to simulate the electromagnetic field and temperature field in the cavity. As a result, the shape of the cavity, the positions of the inlet and outlet, and the heating position can be optimized in order to increase the field strength of the heating area and its distribution, thereby achieving uniform and rapid temperature rise of the tow.