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基于模拟退火算法,提出考虑接触热阻的松散煤体热物性参数估计方法。首先介绍考虑接触热阻影响的传热数学模型,针对由于参数灵敏度系数线性相关,而无法同时估计接触热阻和试样热扩散率的情况,提出先估计热扩散率再估计接触热阻。然后在自行研发的松散煤体热物性测试系统上进行实验测试,参数估计与实验测试结果相符很好(相对误差<2%),仿真计算结果也表明本参数估计方法是可行的。针对研究结果,相同实验条件下,接触热阻随煤样粒径的增加先增加后减小,但不超过6.6681×10-4(m2·K/W),不考虑接触热阻引起的热物性参数测试误差≤3%。
Based on the simulated annealing algorithm, a method to estimate the thermal physical parameter of loose coal considering the contact thermal resistance is proposed. Firstly, the mathematical model of heat transfer considering the influence of contact thermal resistance is introduced. In order to estimate the contact thermal resistance and the thermal diffusivity of the sample due to the linear dependence of the parameter sensitivity coefficient, a new estimation of thermal diffusivity is first proposed to estimate the contact thermal resistance. Then the experiment was carried out on the loose coal thermal property test system developed by ourselves. The parameter estimation was in good agreement with the experimental test (relative error <2%). The simulation results also showed that this method is feasible. According to the research results, under the same experimental conditions, the contact thermal resistance first increases and then decreases with the increase of coal particle size, but it does not exceed 6.6681 × 10-4 (m2 · K / W), without considering the thermal properties caused by the contact thermal resistance Parameter test error ≤ 3%.