Effect of Heat-Insulating Layer Thickness on Melting Rate of Ice Fixed Abrasives Polishing Pad

The formula of the thickness of the heat-insulating layer is deduced via heat transfer analysis,according to the principle of heat transfer in limited space.Polishing experiments are carried out using the same technological parameters.Compared with the polishing experimental results,the heat transfer model is proved to be correct.As validated by the experimental results,polyurethane heat-insulating layer can effectively improve the service life of the ice fixed abrasive pad and alleviate the melting rate in the polishing process to improve the polishing quality proposed.The heat transfer model provides theoretical basis for research of temperature field of ice fixed abrasive polishing.

随环境变化的土壤热波动特性研究

根据周期性变化的环境温度和土壤半无限大平壁假设,建立了土壤导热数学模型,并采用PHOENICS3.6软件求解,得出了不同温度波对土壤导热区域的影响。研究了不同频率、振幅的热波及不同物性参数的土壤对不同深度处热波响应特性的影响。指出该研究方法可以应用于冷热油交替输送管道的非稳态温度场研究。

煤不稳态顺流式层状燃烧数学模型的建立

介绍了一维不稳态煤的顺流式层状燃烧数学模型的建立过程,利用该模型可进行煤的顺流式层状燃烧特性及其影响因素的研究。