Investigation of boiling hydrogen flow characteristics under low-pressure conditions - Flow regime transition characteristics
Investigation of boiling hydrogen flow characteristics under low-pressure conditions - Flow regime transition characteristics
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低压条件下沸腾氢气流动特性研究——流态转变特性
DOI：
10.1016/j.ijhydene.2020.12.038
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发表时间：
2021
影响因子：
7.2
通讯作者：
Sato Tetsuya
中科院分区：
文献类型：
--
作者：
Sakamoto Yuki;Kobayashi Hiroaki;Naruo Yoshihiro;Takesaki Yuichiro;Nakajima Yo;Kabayama Koki;Sato Tetsuya
了解沸腾氢的热-流体特性对于液氢在替代清洁能源、空间飞行器等领域的应用具有重要意义。液氢在常压下沸腾温度为20.3℃，易沸腾形成气液两相流。在航天工业中，由于燃料流动的不稳定性，避免了燃料在沸腾状态下的转移，为了提高航天器的性能，需要对燃料进行精确的控制，包括沸腾流量。本研究旨在通过实验研究来了解沸腾氢的流型转变特性。实验条件为：流动方向为水平方向，加热管内径为15 mm，质量流量为50~110 kgm2/s，压力为250~300kPaA。实验过程中观察到了全液相(LP)、分散泡状流(DB)、间歇流(IN)和环状流(AN)。每个流型边界模型都是基于Taitel-Dukler模型的实验结果中的两个主要作用力来建立的。对于DB/IN边界，大气泡可持续条件是由作用在气泡上的剪切力和浮力之间的平衡得出的；对于IN/AN边界，液滴可持续条件是根据作用在液滴上的阻力和重力之间的力平衡得出的。半理论模型对实验数据的预测准确率为96.7%。
Understanding the thermal-fluid characteristics of boiling hydrogen is of great significance for applications of liquid hydrogen, such as alternative clean energy and space vehicles. The boiling temperature of liquid hydrogen under atmospheric pressure is 20.3 K; thus, it is easy to boil to form a gas–liquid two-phase flow. Fuel transfer under the boiling state has been avoided in the space industry because of its unstable flow characteristics; precise control of the fuel, including the boiling flow, is necessary to improve the space-vehicle performance. This study aims to understand the flow-regime transition characteristics of boiling hydrogen through experimental investigation. The experimental conditions were as follows: the flow direction was horizontal, the inner diameter of the heating pipe was 15 mm, the mass flux ranged from 50 to 110 kg/m2s, and the pressure ranged from 250 to 300 kPa A. The flow-regime transition characteristics were obtained by a high-speed camera. Fully liquid phase (LP), dispersed bubbly flow (DB), intermittent flow (IN), and annular flow (AN) were observed during the experiment. Each flow-regime boundary model is constructed using two dominant forces from the experimental result based on a Taitel–Dukler model. For the DB/IN boundary, a large-bubble sustainable condition is derived by the balance between the shear and buoyancy forces acting upon the bubble; for the IN/AN boundary, a droplet-sustainable condition is derived in terms of the force balance between the drag and gravity acting on the droplet. The semi-theoretical model predicts the experimental data with 96.7% accuracy.
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