论文部分内容阅读
针对试验条件下结构为Φ28.6×5.8mm的四头优化内螺纹管,进行了垂直并联双管低质量流速下自补偿特性的试验研究,结果表明:垂直并联管组在试验参数范围内具有明显的自补偿特性;在管内工质的汽化过程中热负荷较小的支管内工质的质量流速随着吸热量的增加先减小再增大,当管内工质的干度随吸热量增加而达到较高时,管内工质的质量流速逐渐接近或超过平均质量流速,系统的自补偿特性渐渐消失。结果还表明:工质干度较低时,较大的热负荷偏差会强化系统的自补偿特性,而工质干度较高时,较大的热负荷偏差会减弱系统的自补偿特性;另一方面,工质干度较低时,系统压力的增大会减弱垂直管屏的自补偿能力;当工质干度较高时,系统压力的增大会导致两相摩擦压降减小,导致系统的自补偿特性增强。
Experimental study on self-compensating characteristics of vertical parallel dual-tube with low mass flow rate under the conditions of experimental conditions, the structure is Φ28.6 × 5.8mm four-tube optimized internal thread tube, the results show that: the vertical parallel pipe group within the experimental parameters have Obvious self-compensation characteristics; in the process of vaporization of working fluid in the tube, the mass flow rate of the working medium in the branch with smaller heat load decreases first and then increases with the increase of endothermic amount. When the dryness of the working fluid in the tube changes with endothermic When the volume increases and reaches a higher level, the mass flow rate of the working fluid in the tube gradually approaches or exceeds the average mass flow rate, and the self-compensation characteristics of the system gradually disappear. The results also show that when the working fluid dryness is low, the larger thermal load deviation will strengthen the self-compensation characteristics of the system, and the larger thermal load deviation will weaken the self-compensation characteristics of the system when the working fluid dryness is high. On the one hand, when the working fluid dryness is low, the increase of system pressure will weaken the self-compensation ability of the vertical tube screen; when the working fluid dryness is high, the increase of system pressure will cause the frictional pressure drop of the two phases to decrease, The self-compensation characteristics are enhanced.