高温矿井巷道风流对流换热相似实验研究

运用模型实验相似理论，推导出高温矿井巷道风流对流换热原型和模型之间的相似判据，建立了高温矿井巷道风流对流换热的实验系统。测量并分析了不同巷道壁温、不同入口风速以及入口温度对对流换热系数的影响；利用相关分析的方法，分析了巷道壁温、入口风速和巷道平均风流温度对对流换热系数的影响程度，得到各因素对对流换热系数影响程度，按从大到小的顺序为巷道平均风流温度、入口风速及巷道壁温；其中，巷道平均风流温度和入口风速均与对流换热系数呈正相关，而巷道壁温与对流换热系数呈负相关。基于对各影响因素的分析,得到了高温矿井巷道风流对流换热实验关联式，该关联式可以在实验范围内计算实际矿井风流的对流换热系数。

Similarity Experimental Study of the Airflow Convective Heat Transfer in High Temperature Roadway

The similarity criterion between the convective heat transfer prototype of the model is derived based on model experimental similarity theory,and a set of experimental system is established to study the convective heat transfer characteristics of airflow in high temperature roadway.The varying contents of roadway wall temperature,inlet airflow velocity and inlet temperature are measured,and the influence of the factors to airflow convective heat transfer coefficient is analyzed.The influence degree of roadway wall temperature,inlet airflow velocity and average roadway airflow temperature to the airflow convective heat transfer coefficient is also discussed by using correlation analysis method.Among the above three factors,the average roadway airflow temperature is the main influence one of airflow convective heat transfer coefficient,while,the roadway wall temperature is the least important one of airflow convective heat transfer coefficient.To be specific,the airflow convective heat transfer coefficient is positively correlated with average roadway airflow temperature and inlet airflow velocity,while the correlation between the airflow convective heat transfer coefficient and roadway wall temperature is negative.Based on the analysis of the above influence factors,a empirical correlation of airflow convective heat transfer in high temperature roadway is obtained,and it can be used to calculate the actual airflow convective heat transfer coefficient in high temperature roadway within the range of experiments.