首页|高压氢燃料气瓶加压惰化排气陡降机制

高压氢燃料气瓶加压惰化排气陡降机制

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  • 国家科技期刊平台
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为了提高惰化效率并确保高压氢燃料气瓶的安全应用,采用数值模拟方法评估加压惰化过程中的氧气体积分数变化特征.在加压注气过程中最大氧气体积分数位于氢燃料气瓶的底部区域,而在排气过程开始阶段发现最大氧气体积分数的陡降现象,设计不同的模拟方案分析陡降现象的原因.结果表明:速度-压力耦合效应是排气过程开始阶段氧气体积分数陡降的根本原因,其中瓶内速度场的影响占主导地位,速度场的影响在未静置和静置方案中分别为 91.4%和 86.7%,而压力场的影响仅为 8.6%和 13.3%;排气反向冲量及排气低压向瓶内传递诱导流场,叠加加注形成流场共同促使气瓶底部区域内的流动再循环,使得瓶底区域的流动速度增加且速度场与氧气体积分数场协同效应加强,强化了对流传质形成陡降现象.
Mechanism of sharp drop in pressurized inert exhaust from high-pressure hydrogen fuel cylinders
To improve the inerting efficiency and ensure the safe application of high-pressure hydrogen fuel cylinders,numer-ical simulations were applied to evaluate the oxygen volume fraction variation characteristic of the pressurized inerting process.The maximum oxygen volume fraction was located at the bottom zone of the cylinder during the charging process.A sharp drop phenomenon of maximum oxygen volume fraction at the beginning stage of the exhaust process was detected,and different simulation strategies were designed to analyze the reason of the phenomenon.The results show that,the velocity-pressure coupling effect has a particularly substantial influence on the sharp drop of oxygen volume fraction at the beginning stage of the exhaust process,and the effect of the velocity distribution of the charging process is predominant.The effect of velocity on the oxygen volume fraction is 91.4%for the non-static option,and it is 86.7%for the static option.The effect of pressure on the oxygen volume fraction is 8.6%for the non-static option,and it is 13.3%for the static option.The reverse impulse of exhaust gas,the flow field induced by transmission in the exhaust low-pressure bottle,and the flow field formed by superposition filling jointly promote the flow recirculation in the bottom zone of the bottle,which increases the flow velocity in the bottom zone of the bottle and strengthens the synergistic effect between the velocity field and the oxygen volume fraction field,thus strengthening the phenomenon of sharp drop of convective mass transfer.

high-pressure hydrogen fuel cylindersinert gasoxygen volume fractionconvective mass transfervelocity-pressure couplingnumerical simulation

邓佳佳、庹中兰、夏海山、薛大文、王薛人、赵文杰、吴硕、卢金树

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广西电力职业技术学院,广西南宁 530007

浙江海洋大学船舶与海运学院,浙江舟山 316022

高压氢燃料气瓶 惰性气体 氧气体积分数 对流传质 速度-压力耦合 数值模拟

浙江省基础公益研究计划浙江省舟山市科技局项目浙江省舟山市科技局项目广西电力职业技术学院能源管控与安全工程技术服务项目生物质燃料综合利用工程技术中心项目

LY18E0900092016C120102018C120442021KF07桂电院[2021]335

2024

10.3969/j.issn.1673-5005.2024.01.018

中国石油大学学报(自然科学版)
中国石油大学

中国石油大学学报(自然科学版)

CSTPCD北大核心
影响因子：1.169
ISSN：1673-5005
年,卷(期)：2024.48(1)
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