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为了研究沥青路面微波加热再生过程中的温度场分布,根据傅里叶传热学理论建立了二维微波热再生传热数学模型;用角锥喇叭口面场近似辐射场,研究了微波内热源;建立边界条件并进行了归一化处理。基于控制容积的有限差分法(CV-BDM)建立了微分方程的隐式离散格式并进行了数值模拟;选用了工业频率2.45GHz的微波试验系统,采用连续加热工艺和间歇加热工艺,研究在沥青路面内二维温度场中温度随加热时间的变化特性。结果表明微波加热时温度上升是非线性的,在加热初期升温较慢,后期升温较快;沥青混合料内温度分布是不均匀的,其口面中心区域附近温度较高,而边缘处温度较低。当采用间歇加热工艺时,可有效提高沥青混合料受热均匀性。必须合理选择加热时间。数值模拟和试验取得了较好的一致性。  相似文献   
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矿井提升机运行智能监测监控的研究   总被引:1,自引:0,他引:1  
对矿井提升机运行各参数的智能监测监控方法进行了探讨,设计了硬件测试回路。根据检测参数进一步识别提升机运行状态,对不同的故障工况分别进行报警、启动减速回路、紧急制动处理,并使用C++编制监控系统软件进行过程实时监测监控,以确保提升机安全可靠地运行。  相似文献   
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In order to assess temperature field in microwave heating for recycling asphalt pavements,a 2D mathematic heat transfer model was developed based on Fourier heat transfer theory The microwave internal heat?generation was researched by using surface field of pyramidal horn replacing approximate radiation field In addition,the boundary conditions were built and normalization processing was implemented The control volume based finite differential method (CV-BDM) was used to establish the implicit discrete scheme of the conservation equations,and the numerical value simulation was employed By continuous or intermittent  radiation heating technique,a microwave heating experimental system at 2 145 GHz was carried out to investigate temperature variation characteristics of asphalt pavements along with heating time The result shows that (1) the increase of temperature of asphalt mixture during microwave heating is obviously nonlinear,the temperature rises slowly in the initial stage of the heating but increases rapidly in the late heating period; (2) the temperature distribution is non-uniform that the temperature in central area of the surface is higher while it is lower on edge; (3) the uniformity of temperature within asphalt mixtures can be improved by using intermittent heating technique,and the heating time must be reasonable The simulation results are in preferable agreement with the experiment  相似文献   
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