压水堆主系统T型三通管传热实验研究

Experimental Study on Heat Transfer Characteristic of T-Junction in Cooling System of PWR

对射流垂直向下入射至主流中,射流管与主管直径比为0.16时,在宽广的射流与主流流速比范围内(R=0.01～1.5),测量了3个不同区域内加装热套管前后三通管传热情况.通过实验得到了不同流速比条件下不同区域的近壁流体温度及换热系数,比较了热套管对于三通管传热的影响.通过实验发现,热套管的主要影响区域是射流管与主管连接区及射流管内,对于射流管下游区域的影响很小.在流速比较高时,热套管的影响作用更明显一些.

The near wall local fluid temperature and heat transfer coefficient distribution in three different areas were measured for T-junction with and without thermal sleeve where jet injected vertically down to the main flow. Flows with velocity ratio between 0.01 and 1.5 were measured. The diameter ratio of jet pipe to main pipe is 0.16. It is found at that downstream of the jet the thermal sleeve has little effect on heat transfer coefficient and near wall fluid temperature. The thermal sleeves effect is more marked when the velocity ratio becomes larger.