摘要
针对直径为31.8 mm、壁厚为6.0 mm的六头内螺纹管,建立了垂直并联管的物理模型,对垂直并联管的自补偿特性进行了理论计算与实验研究。理论计算表明:具有热负荷偏差的并联垂直管组有明显的自补偿特性;吸热量较小的垂直管内工质的质量流速随吸热量的增加先减小,后增大;当管内工质的质量流速接近或超过平均质量流速,系统的自补偿特性减弱直至消失。实验研究表明:并联垂直管组的自补偿特性随管内工质干度的增加先增强,后减弱;当工质干度很高时,系统的自补偿特性可能消失并随之出现负流量响应特性;当并联管组内工质汽化程度较低时,不均匀加热比的增大会增强并联管的自补偿特性;当管内工质汽化程度较高时,不均匀加热比的增大会减弱并联管的自补偿特性。
The physical model has been built up by using parallel six head internally ribbed pipes of Φ31.8 mm×6.0 mm to do the calculation for the vertical parallel tubes with self-compensating characteristics.According to the theoretical calculation result,the vertical parallel tubes with heat flux difference between pipes have obvious self-compensating characteristics.Meanwhile,the mass velocity of water in the pipe with lower heat flux goes down first and then goes up with the increasing of heat absorption.When the steam quality reaches high level,the mass velocity in lower heat flux tube meets or exceeds the average value and the self-compensating characteristics of the system disappears.The experimental research has been carried out based on the calculation result.The experimental results show that the quality and the heat flux difference between pipes have great effect on the self compensation characteristics of the system.The mass velocity in the tube with less heat flux decreased first with the rising quality and then increased.Self-compensating characteristics of vertical parallel tubes disappears when quality gets high.The experimental results also show that when the quality is low,the increasing of the uneven heating ratio strengthens the self-compensating characteristics of the system,in contrast,while the quality is high,the increasing of the uneven heating ratio weakens it.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2011年第1期70-74,共5页
Nuclear Power Engineering
关键词
自补偿特性
六头内螺纹管
垂直管屏
低质量流速
Self-compensating characteristics
Six head internally ribbed pipe
Vertical parallel tubes
Low mass velocity
