ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Steady-state working performance of loop heat pipes in acceleration environment: Comparative study
Received date: 2021-12-10
Revised date: 2022-03-25
Accepted date: 2022-05-17
Online published: 2022-06-08
Supported by
Aerospace Innovation Foundation(CAST-BISEE2019-009)
Loop heat pipes have significant application potential in the cooling field of airborne electronic equipment. Two sets of ammonia-stainless steel dual compensation chamber loop heat pipes with different line lengths were used， and an experimental platform was built to obtain the working performance of loop heat pipes under the acceleration condition. The steady-state performance of two loop heat pipes under gravity， 1g to 7g inverse acceleration conditions and 100 W to 300 W heat loads was experimentally studied. Combined with the force analysis of working fluid， a prediction model of total flow resistance of loop heat pipes under the acceleration condition was established. The influence law and mechanism of different acceleration， heat loads and heat pipe structures on the working performance of loop heat pipes were analyzed. The results showed that the variation curve of the operating temperature of the loop heat pipe with heat load presented a “V” shape under gravity. The inverse acceleration would cause the increase of loop flow resistance， resulting in the increase of working temperature or even overtemperature， particularly for the loop heat pipe with long liquid pipelines. The operating temperature of the heat pipe with a long liquid line was lower than that of the heat pipe with a long vapor line with 1g and 3g inverse acceleration and small heat loads， while it was the opposite with 5g and 7g inverse acceleration. Under gravity and the acceleration condition， the critical heat load of both the variable heat conductance zone and the constant heat conductance zone was about 200 W. The experimental results provide certain guidance for the design and installation of loop heat pipes.
Siyuan LIU , Yongqi XIE , Jian SU , Hongxing ZHANG , Guoguang LI . Steady-state working performance of loop heat pipes in acceleration environment: Comparative study[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023 , 44(4) : 126803 -126803 . DOI: 10.7527/S1000-6893.2022.26803
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