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Model experiment on pressure drop and thermal recovery efficiency of tandem double-U-shaped-tube heat exchangers
Received date: 2016-04-07
Revised date: 2016-05-17
Online published: 2017-04-11
In order to investigate the flow and heat transfer performances of tandem double-U-shaped-tube heat exchangers, model experiments are conducted. The effects of arrangement of the tandem heat exchangers on the nozzle pressure drop and recuperator effectiveness are obtained. The results show that the nozzle pressure drop is increased with the increase of heat exchanger inclined angle. The inclined angle of the last heat exchanger adjacent to the convergent nozzle exit has the most significant influence on the nozzle pressure drop, and the influence of the front heat exchanger adjacent to the nozzle inlet comes the second. In comparison with the situation where a single heat exchanger is placed inside the nozzle, the influence of the inclined angle of the front heat exchanger on pressure drop is slightly weakened when tandem heat exchangers is used. When the inclined angle of the front heat exchanger is small, the thermal recovery efficiency achieved by the front heat exchanger is very low, thus making it difficult to improve the overall thermal recovery efficiency of tandem heat exchangers. Among several arrangements of tandem heat exchangers in the present tests, the inclined angles of 30°-17°-13° corresponding to the three tandem heat exchangers appears to be more reasonable for obtaining the optimum comprehensive flow and heat transfer performance.
LIU Xiyue , ZHANG Jingzhou , LI Gangtuan , KANG Yong . Model experiment on pressure drop and thermal recovery efficiency of tandem double-U-shaped-tube heat exchangers[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017 , 38(3) : 120302 -120302 . DOI: 10.7527/S1000-6893.2016.0159
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