Modeling and pressure control characteristics of thermodynamic venting system in liquid hydrogen storage tank

doi:10.11949/j.issn.0438-1157.20161347

CIESC Journal ›› 2016, Vol. 67 ›› Issue (S2): 20-25.DOI: 10.11949/j.issn.0438-1157.20161347

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Modeling and pressure control characteristics of thermodynamic venting system in liquid hydrogen storage tank

WANG Bin^1,2, WANG Tianxiang¹, HUANG Yonghua², WU Jingyi², LEI Gang¹

1. State Key Laboratory of Technologies in Space Cryogenic Propellants, Beijing 100028, China;
2. Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2016-06-17 Revised:2016-09-26 Online:2016-12-30 Published:2016-12-30
Supported by:
supported by the Open Research Fund of the State Key Laboratory of Technologies in Space Cryogenic Propellants (SKLTSCP1206-W) and the National Natural Science Foundation of China (51676118).

液氢贮箱热力学排气系统建模及控压特性

汪彬^1,2, 王天祥¹, 黄永华², 吴静怡², 雷刚¹

1. 航天低温推进剂技术国家重点实验室, 北京 100028;
2. 上海交通大学制冷与低温工程研究所, 上海 200240

通讯作者: 黄永华
基金资助:
航天低温推进剂技术重点实验室基金课题项目（SKLTSCP1206-W）；国家自然科学基金项目（51676118）。

Abstract

Abstract:

To study the pressure control of cryogenic propellant container, an analytical lumped parameter model is established to predict the behavior of pressure variation inside a liquid hydrogen tank with TVS installed.Simulations are conducted for the tank with volume of 18.09 m³ initially filled with 75% LH₂ and with a heat leak load of 0.76 W·m^-2.Calculation results are compared with literature to verify the feasibility of the proposed model.The results show that the ullage pressure rises much faster than the liquid saturation pressure, and TVS is highly effective and feasible in controlling the tank pressure within 165.5-172.4 kPa.The pressure change characteristics under mixing mode and venting mode are compared and analyzed.The pressure decreasing rate under venting mode is found to be 7 times of that under mixing mode.However, the pressure rising rate under venting mode is about 95% of that under mixing mode.The temperature profiles are also studied.

Key words: liquid hydrogen tank, thermodynamic vent system, pressure control, simulation analysis

摘要：

以低温推进剂液氢贮箱压力控制为目标，建立了热力学排气系统（TVS）和贮箱内流体流动及气液相变过程的数学模型。以18.09 m³液氢贮箱在地面工况充注率75%、漏热量0.76 W·m^-2为例，计算了贮箱自增压过程及开启TVS后对贮箱压力控制的效果。结果表明，气枕升压速率远大于液体温度对应的饱和压力的升压速率；TVS运行后可将贮箱压力有效地控制在165.5~172.4 kPa范围内。对比了混合与排气两种不同运行模式下贮箱气枕的升降压特性，发现排气模式下的气枕降压速率为混合模式的7倍，升压速率为混合模式的95%。同时还分析了贮箱内液体的温度变化规律。

关键词: 液氢贮箱, 热力学排气系统, 压力控制, 仿真分析

CLC Number:

V511.6

WANG Bin, WANG Tianxiang, HUANG Yonghua, WU Jingyi, LEI Gang. Modeling and pressure control characteristics of thermodynamic venting system in liquid hydrogen storage tank[J]. CIESC Journal, 2016, 67(S2): 20-25.

汪彬, 王天祥, 黄永华, 吴静怡, 雷刚. 液氢贮箱热力学排气系统建模及控压特性[J]. 化工学报, 2016, 67(S2): 20-25.

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Modeling and pressure control characteristics of thermodynamic venting system in liquid hydrogen storage tank

液氢贮箱热力学排气系统建模及控压特性

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