强迫对流条件下管内测温准确性分析

In this paper, the temperature measuring accuracy under three different kinds of conditions that the thermal couple temperature measuring point at the centre, the side of hollow pipe and cling to the pipe's inner wall and under the conditions that the air in pipe is under forced convenction condition have been analysesed using the numerical simulation method.Then it come to a conclusion that the total error of temperature measuring is small only the temperature measuring point cling to the pipe's inner wall and at the other two conditions the average error of temperature measuring become linear growth with the airflow velocity increase.Therefore, it present a theory basis of freezing wall surveying that through the method of putting a temperature measuring rod in a hollow frozen pipe during the excavation of inclined shaft freezing construction.What's more, it also offer a temperature measuring way in some project when it can't bury the temperature measuring point in advance. In general, this conclusion has a high engineering value.