沥青路面微波加热器电磁仿真与实验分析

为了研究微波加热再生沥青路面时的热电效率和再生温度分布的均匀性,设计了一种波导激励腔,并应用于微波加热器的结构设计.运用波导传输线理论,确定了激励腔的结构尺寸.采用IE3D分别对磁控管探头(天线)与短路板间距、不同喇叭长度和口面尺寸、不同沥青混合料介电性能和加热腔口面与沥青路面不同距离4种情况进行了电磁仿真.结果表明:...

Electromagnetic simulation and experimental analysis of microwave heaters for asphalt pavements

In order to study the thermoelectric efficiency of microwave heating and reproduction of asphalt pavements and the uniformity of reproduction temperature distribution,a waveguide excitation cavity is designed and applied to the structural design of a microwave heater.The structural sizes of the incentive cavities are determined based on the waveguide transmission line theory.Using IE3D software,electromagnetic simulations are respectively carried out in four different situations,including the distances between the magnetron probes(antennas) and a short-circuit board,different horn electric lengths and aperture sizes,different dielectric properties of the asphalt mixture,and the distances between the asphalt surface and the mouth cavity.The results show that,when the distance between the magnetron probe and the short-circuit board is 32.5 mm,it is the best installation site;reduction of aerial length is the main factor in improving the heating uniformity.When the aggregate is limestone,the best heating effect can be produced.Maximum radiation efficiency can be realized by adjusting the space between the heater radiation port and the asphalt pavement.The experimental results of asphalt mixture heating in four different situations have a substantial agreement with the simulation results,which confirms that the developed microwave heater can achieve better impedance matching,thus improving the quality and efficiency of heating regeneration.