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The development of hydrogen-powered aircraft is a key strategy for the aviation industry to achieve carbon neutrality. Compared to high-pressure gaseous hydrogen, cryogenic liquid hydrogen will be the main fuel for future hydrogen-powered commercial aviation. However, the occurrence of cavitation in liquid hydrogen during transport has the potential to result in an unstable or even interrupted fuel supply to the engine, which could ultimately lead to catastrophic risks to flight safety. Using numerical simulation method, based on homogeneous mixed flow model, Navier-Stokes (RANS) method and Zwart cavitation model, the cavitation flow characteristics and development law of liquid hydrogen in aircraft transport pipelines were deeply studied, and partially compared with normal temperature water. The results show that the cavitation number, the outlet/inlet pressure ratio, and the length/diameter ratio have a significant influence on the occurrence and development of cavitation. The condensation process of liquid hydrogen is considerably slower than the evaporation process. The effect of the cavitation number on the evaporation process is minimal, but it has a significant effect on the maximum condensation rate. The critical pressure ratio for the disappearance of cavitation in liquid hydrogen is lower than in water. At the same pressure ratio, water cavitates more easily than liquid hydrogen, with a greater number of cavitation bubbles and a thicker cavitation region. Reducing the length/diameter ratio can inhibit the occurrence and development of cavitation in liquid hydrogen. It is recommended that the diameter of the contraction section be increased to achieve a higher outlet flow, rather than shortening the length of the pipeline.
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发展氢燃料航空器是民航业实现碳中和的最主要途径之一。相较于高压气氢,低温液氢将成为未来氢动力民航商用客机的主要燃料。液氢在输运过程中一旦发生空化将导致发动机燃料供应不稳定甚至供应中断,严重时可能会对飞行安全造成灾难性影响。采用数值模拟的方法,基于均质混合流模型,采用RANS(Navier-Stokes)法和Zwart空化模型,深入研究了液氢在飞机输运管路中的空化流动特性及发展规律,并与常温水进行了部分对比。结果表明: 空化数、进出口压比和长径比对空化的发生与发展均有重要影响。液氢的凝结过程要比蒸发过程慢得多,空化数对蒸发过程几乎无影响,主要影响最大凝结速率;液氢空化消失的临界压比低于水的临界压比,同一压比下,水比液氢更容易发生空化,且空化区尾部空泡更多,空化区更厚;减小长径比可抑制液氢空化的发生和发展,相较于减小管道长度,建议增大收缩段的管径以获得更高的出口流量。
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崔艳雨(1973—),男,汉族,辽宁锦州人,博士,教授。研究方向:民航新能源应用安全及可靠性。E-mail:yycui@cauc.edu.cn。
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崔艳雨(1973—),男,汉族,辽宁锦州人,博士,教授。研究方向:民航新能源应用安全及可靠性。E-mail:yycui@cauc.edu.cn。
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Comparison of outlet mass flow rate and error under different first boundary layer thicknesses, figureFileSmall=2o2/XvBLcu2s+3Wxf78PRw==, figureFileBig=q/UjpwOLyHGgS+U3k1l2Ug==, tableContent=null), ArticleFig(id=1217860112992096399, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=CN, label=图2, caption=
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水翼几何模型和网格划分, figureFileSmall=TSVNYzFXlhUC6Do/qqsoDQ==, figureFileBig=zbZQCrIE3dmUgyMedmp/nw==, tableContent=null), ArticleFig(id=1217860113344417974, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=EN, label=Fig.4, caption=
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压力计算结果与实验对比 x0为与水翼头部的水平距离
, figureFileSmall=wetujqzqic1CsLtCWtBHMg==, figureFileBig=wBvBuuJiBz/Z0vD/zkUpqA==, tableContent=null), ArticleFig(id=1217860113541550293, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=EN, label=Fig.5, caption=
Variations in the gas volume fraction during liquid hydrogen cavitation at different cavitation numbers, figureFileSmall=A62Q6MUD0LwAIDgPxY2Ddw==, figureFileBig=4+hqVQbbJJ++wj99bPEd2w==, tableContent=null), ArticleFig(id=1217860113654796514, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=CN, label=图5, caption=
不同空化数下液氢空化过程中气体体积分数的变化, figureFileSmall=A62Q6MUD0LwAIDgPxY2Ddw==, figureFileBig=4+hqVQbbJJ++wj99bPEd2w==, tableContent=null), ArticleFig(id=1217860113822568687, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=EN, label=Fig.6, caption=
Wall pressure in the contraction section at different cavitation numbers, figureFileSmall=qNDfmzSvyRc9o6/uwQO8jQ==, figureFileBig=RtdT7qILqS6JHQb9vGMKew==, tableContent=null), ArticleFig(id=1217860113927426304, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=CN, label=图6, caption=
不同空化数下收缩段壁面压力 x为与收缩段起始位置的轴向距离;Pwall为壁面压力
, figureFileSmall=qNDfmzSvyRc9o6/uwQO8jQ==, figureFileBig=RtdT7qILqS6JHQb9vGMKew==, tableContent=null), ArticleFig(id=1217860114086809876, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=EN, label=Fig.7, caption=
Mass transfer rate of liquid hydrogen in the contraction section at different cavitation numbers, figureFileSmall=u2s7JyyhnYiZqhR8P2Du0g==, figureFileBig=eFrXigHlTHQFS1hb5xv8mA==, tableContent=null), ArticleFig(id=1217860114174890272, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=CN, label=图7, caption=
不同空化数下收缩段液氢传质速率, figureFileSmall=u2s7JyyhnYiZqhR8P2Du0g==, figureFileBig=eFrXigHlTHQFS1hb5xv8mA==, tableContent=null), ArticleFig(id=1217860114380411184, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=EN, label=Fig.8, caption=
Maximum condensation rate of liquid hydrogen in the contraction section at different cavitation numbers, figureFileSmall=nQUsI1sPkNWBhB+682WZXg==, figureFileBig=Oa616QIf/pBD9UriAzvT8g==, tableContent=null), ArticleFig(id=1217860114502046017, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=CN, label=图8, caption=
不同空化数下收缩段液氢的最大凝结速率, figureFileSmall=nQUsI1sPkNWBhB+682WZXg==, figureFileBig=Oa616QIf/pBD9UriAzvT8g==, tableContent=null), ArticleFig(id=1217860114653040980, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=EN, label=Fig.9, caption=
Comparison of dimensionless mass transfer rate for liquid hydrogen and water, figureFileSmall=5lfZxPEwF7UyBSBfIz7Uyw==, figureFileBig=br4zmsnnXyFcTGkTqdVWmA==, tableContent=null), ArticleFig(id=1217860115944886631, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=CN, label=图9, caption=
液氢和水的无量纲传质率对比, figureFileSmall=5lfZxPEwF7UyBSBfIz7Uyw==, figureFileBig=br4zmsnnXyFcTGkTqdVWmA==, tableContent=null), ArticleFig(id=1217860116049744240, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=EN, label=Fig.10, caption=
Comparison of cavitation between liquid hydrogen and water at different outlet/inlet pressure ratios, figureFileSmall=ubntj9042ucXUkLmYpFnFg==, figureFileBig=rlzFyMJioLHa4QUEF8Sc5Q==, tableContent=null), ArticleFig(id=1217860116146213238, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=CN, label=图10, caption=
不同压力比下液氢和水的空化对比, figureFileSmall=ubntj9042ucXUkLmYpFnFg==, figureFileBig=rlzFyMJioLHa4QUEF8Sc5Q==, tableContent=null), ArticleFig(id=1217860116284625283, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=EN, label=Fig.11, caption=
Axial pressure variations in the pipe at different outlet/inlet pressure ratios, figureFileSmall=c5BqmND1kwSHKzlwnnPzRw==, figureFileBig=9dJZcmxywCdimNfJWNs3CQ==, tableContent=null), ArticleFig(id=1217860116444008846, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=CN, label=图11, caption=
不同压比下管道轴线压力变化 Paxis为管道轴线处的压力
, figureFileSmall=c5BqmND1kwSHKzlwnnPzRw==, figureFileBig=9dJZcmxywCdimNfJWNs3CQ==, tableContent=null), ArticleFig(id=1217860116599198112, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=EN, label=Fig.12, caption=
Variations in outlet mass flow rate at different outlet/inlet pressure ratios, figureFileSmall=2sHTsKS7U88njuh48KDTUQ==, figureFileBig=dSnDZlndwvJfjvMBIoMnKw==, tableContent=null), ArticleFig(id=1217860116716638635, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=CN, label=图12, caption=
不同压力比下出口质量流量变化, figureFileSmall=2sHTsKS7U88njuh48KDTUQ==, figureFileBig=dSnDZlndwvJfjvMBIoMnKw==, tableContent=null), ArticleFig(id=1217860116859244986, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=EN, label=Fig.13, caption=
Cavitation regions of liquid hydrogen at different length/diameter ratios, figureFileSmall=7SslZ/am/pxD8hX7Ryc8eg==, figureFileBig=MF7MS6zD0vQggaUvFrSXOA==, tableContent=null), ArticleFig(id=1217860117027017168, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=CN, label=图13, caption=
不同长径比下液氢空化区域, figureFileSmall=7SslZ/am/pxD8hX7Ryc8eg==, figureFileBig=MF7MS6zD0vQggaUvFrSXOA==, tableContent=null), ArticleFig(id=1217860117169623520, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=EN, label=Fig.14, caption=
Radial distribution of gas volume fraction in the pipe at different locations with varying length/diameter ratios, figureFileSmall=A8fPsx2IcQ+iO0vl4A1iyg==, figureFileBig=701FXRZhFyoZre1mUhaB1w==, tableContent=null), ArticleFig(id=1217860117324812783, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=CN, label=图14, caption=
不同位置处不同长径比下管道径向气体体积分数分布, figureFileSmall=A8fPsx2IcQ+iO0vl4A1iyg==, figureFileBig=701FXRZhFyoZre1mUhaB1w==, tableContent=null), ArticleFig(id=1217860117417087481, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=EN, label=Fig.15, caption=
The distribution of positions for maximum evaporation rate, maximum condensation rate, maximum gas volume fraction, and the transition point between evaporation and condensation at different length/diameter ratios, figureFileSmall=PU7ddWVbq7by7HZGIvwi9A==, figureFileBig=TxpTDCRw744Q+A9ucuUaMQ==, tableContent=null), ArticleFig(id=1217860117568082443, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=CN, label=图15, caption=
不同长径比下最大蒸发速率位置、最大凝结速率位置、最大气体体积分数位置以及蒸发凝结转折位置的分布, figureFileSmall=PU7ddWVbq7by7HZGIvwi9A==, figureFileBig=TxpTDCRw744Q+A9ucuUaMQ==, tableContent=null), ArticleFig(id=1217860117727466016, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=EN, label=Fig.16, caption=
Cavitation regions of liquid hydrogen at different length/diameter ratios, figureFileSmall=9YP6fXkls+7jRuwEK2CFxA==, figureFileBig=y+VGIAGJEGH/fevfTOTGJA==, tableContent=null), ArticleFig(id=1217860117870072367, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=CN, label=图16, caption=
不同长径比下液氢空化区域, figureFileSmall=9YP6fXkls+7jRuwEK2CFxA==, figureFileBig=y+VGIAGJEGH/fevfTOTGJA==, tableContent=null), ArticleFig(id=1217860118092370489, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=EN, label=Fig.17, caption=
Variations in outlet mass flow rate at different length/diameter ratios, figureFileSmall=AiryQGspRxql58M0/XxTCA==, figureFileBig=scyZs5rQ4giYaPtnartOBQ==, tableContent=null), ArticleFig(id=1217860118369194572, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=CN, label=图17, caption=
不同长径比下出口质量流量变化, figureFileSmall=AiryQGspRxql58M0/XxTCA==, figureFileBig=scyZs5rQ4giYaPtnartOBQ==, tableContent=null), ArticleFig(id=1217860118520189529, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=EN, label=Table 1, caption=
Simulation conditions at different cavitation numbers
, figureFileSmall=null, figureFileBig=null, tableContent=
| 模拟工况 | v1/(m·s-1) | P2/MPa | σ |
| 1 | 60 | 0.17 | 0.5 |
| 2 | 0.23 | 1 |
| 3 | 0.30 | 1.5 |
| 4 | 0.36 | 2 |
| 5 | 0.42 | 2.5 |
| 6 | 0.48 | 3 |
| 7 | 0.55 | 3.5 |
| 8 | 0.61 | 4 |
), ArticleFig(id=1217860118599881314, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=CN, label=表1, caption=
不同空化数下的模拟工况设置
, figureFileSmall=null, figureFileBig=null, tableContent=
| 模拟工况 | v1/(m·s-1) | P2/MPa | σ |
| 1 | 60 | 0.17 | 0.5 |
| 2 | 0.23 | 1 |
| 3 | 0.30 | 1.5 |
| 4 | 0.36 | 2 |
| 5 | 0.42 | 2.5 |
| 6 | 0.48 | 3 |
| 7 | 0.55 | 3.5 |
| 8 | 0.61 | 4 |
), ArticleFig(id=1217860118708933230, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=EN, label=Table 2, caption=
Physical parameters of liquid hydrogen and water
, figureFileSmall=null, figureFileBig=null, tableContent=
| 物质 | 温度/K | 定压比热容/ (J·kg-1·K-1) | 液体密度/ (kg·m-3) | 饱和蒸汽压/ Pa |
| 水 | 298 | 4 200 | 997 | 12 341 |
| 液氢 | 20 | 9 816 | 71 | 101 325 |
), ArticleFig(id=1217860118838956670, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=CN, label=表2, caption=
液氢与水的物性参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 物质 | 温度/K | 定压比热容/ (J·kg-1·K-1) | 液体密度/ (kg·m-3) | 饱和蒸汽压/ Pa |
| 水 | 298 | 4 200 | 997 | 12 341 |
| 液氢 | 20 | 9 816 | 71 | 101 325 |
), ArticleFig(id=1217860118981563027, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=EN, label=Table 3, caption=
Simulation conditions at different outlet/inlet pressure ratios
, figureFileSmall=null, figureFileBig=null, tableContent=
| 入口压力P1/MPa | 出口压力P2/MPa | 进出口压比P2/P1 | |
| 2.07 | 0.62 | 0.3 | |
| 0.83 | 0.4 | |
| 1.04 | 0.5 | |
| 1.24 | 0.6 | |
| 1.45 | 0.7 | |
| 1.65 | 0.8 | |
), ArticleFig(id=1217860119111586462, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=CN, label=表3, caption=
不同压力比下的模拟工况设置
, figureFileSmall=null, figureFileBig=null, tableContent=
| 入口压力P1/MPa | 出口压力P2/MPa | 进出口压比P2/P1 | |
| 2.07 | 0.62 | 0.3 | |
| 0.83 | 0.4 | |
| 1.04 | 0.5 | |
| 1.24 | 0.6 | |
| 1.45 | 0.7 | |
| 1.65 | 0.8 | |
), ArticleFig(id=1217860120063693483, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=EN, label=Table 4, caption=
Simulated conditions at different length/diameter ratios with varying L0
, figureFileSmall=null, figureFileBig=null, tableContent=
| L0/mm | R0/mm | L0/R0 |
| 3.175 | 3.175 | 1 |
| 6.350 | 2 |
| 12.700 | 4 |
| 19.050 | 6 |
| 25.400 | 8 |
| 31.750 | 10 |
| 47.625 | 15 |
| 63.500 | 20 |
), ArticleFig(id=1217860120239854260, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=CN, label=表4, caption=
不同长径比(变L0)下的模拟工况设置
, figureFileSmall=null, figureFileBig=null, tableContent=
| L0/mm | R0/mm | L0/R0 |
| 3.175 | 3.175 | 1 |
| 6.350 | 2 |
| 12.700 | 4 |
| 19.050 | 6 |
| 25.400 | 8 |
| 31.750 | 10 |
| 47.625 | 15 |
| 63.500 | 20 |
), ArticleFig(id=1217860120407626430, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=EN, label=Table 5, caption=
Simulated conditions at different length/diameter ratios with varying R0
, figureFileSmall=null, figureFileBig=null, tableContent=
| L0/mm | R0/mm | L0/R0 |
| 12.7 | 6.350 0 | 2 |
| 3.175 0 | 4 |
| 2.116 7 | 6 |
| 1.587 5 | 8 |
), ArticleFig(id=1217860120587981519, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1217789894190092350, language=CN, label=表5, caption=
不同长径比(变R0)下的模拟工况设置
, figureFileSmall=null, figureFileBig=null, tableContent=
| L0/mm | R0/mm | L0/R0 |
| 12.7 | 6.350 0 | 2 |
| 3.175 0 | 4 |
| 2.116 7 | 6 |
| 1.587 5 | 8 |
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