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Self-recirculation casing treatment can significantly improve the aerodynamic performance of the supercritical carbon dioxide centrifugal impeller in small flow rate region, but the improvement is not obvious near the large flow rate region. Therefore, the coupling effect between the self-recirculation casing treatment and the key parameter of the impeller is considered, and the coupling optimization of the casing treatment geometry and the impeller blade sweep angle is carried out to achieve a comprehensive improvement of the impeller performance. After the coupling optimization, the efficiency of the impeller is increased by 3.51%, 2.60% and 4.43% respectively under the large flow rate condition, the design condition and the small flow rate condition. The mechanisms of the coupling optimization for stability and efficiency enhancements are as follows. Under the large flow rate condition, the flow incidence angle of impeller is improved, the subcritical zone inside the impeller is reduced, then the condensation is suppressed and the flow capacity of the impeller is improved. Under the design condition, the recirculation flow of casing treatment is increased, more low-energy fluid near the shroud tip is removed, and the flow field structure downstream of the impeller is improved. Under the small flow rate condition, the internal blockage of the impeller is effectively reduced, the flow stability of the impeller is enhanced, and the mixing loss caused by the recirculation flow is improved, so the impeller efficiency is improved.
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自循环机匣处理能够显著提升超临界二氧化碳离心叶轮小流量区域的气动性能,但对大流量工况附近的性能提升不明显。为此,考虑自循环机匣与叶轮关键参数的耦合效应,对机匣几何和叶轮叶片掠角实施耦合优化,实现了叶轮性能的全面提升。耦合优化后叶轮在大流量工况、设计工况及小流量工况下的效率分别提升了3.51%、2.60%、4.43%。耦合优化的扩稳增效机理为:在大流量工况下改善了叶片前缘进口攻角,减小了叶轮内部亚临界区,抑制了冷凝的同时改善了叶轮内部流通能力;设计工况下机匣的抽吸量增大,叶顶附近更多低能流体被移除,改善了叶轮下游流场结构;小流量工况下显著减小了叶轮内部堵塞面积,叶轮流动稳定性增强,同时改善了机匣回流造成的掺混损失,叶轮效率提升。
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Sandia压缩机原型及重构几何, figureFileSmall=65dWzlYAPZHUnmp7fyVu3g==, figureFileBig=07UAr+onXlVY3e7NLfFd3A==, tableContent=null), ArticleFig(id=1241137060434735248, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Fig.2, caption=
Grid distribution of Sandia compressor, figureFileSmall=uucMK+LnEoyB9fFP94giow==, figureFileBig=H+hkmqMWaXPxh4iodWveXg==, tableContent=null), ArticleFig(id=1241137060514427033, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=图2, caption=
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Sandia压缩机实验值与数值模拟对比, figureFileSmall=r8vN4hQbyctThC3A5JMwWg==, figureFileBig=XNxPuBPhS6RQl8D8/CiPkQ==, tableContent=null), ArticleFig(id=1241137060761890993, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Fig.4, caption=
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基准叶轮初步设计流程, figureFileSmall=oV0l0SPALkNSkPqtDRFuQA==, figureFileBig=/Ji2Q2Of/SJ0fmRZ0CRTkA==, tableContent=null), ArticleFig(id=1241137060938051770, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Fig.5, caption=
Model and grid of baseline impeller, figureFileSmall=3gx6KVoyZ3knB5bi0++08g==, figureFileBig=F50Y3Zl2d90NNXsCb5UwLw==, tableContent=null), ArticleFig(id=1241137061042909376, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=图5, caption=
基准叶轮模型与网格划分, figureFileSmall=3gx6KVoyZ3knB5bi0++08g==, figureFileBig=F50Y3Zl2d90NNXsCb5UwLw==, tableContent=null), ArticleFig(id=1241137061193904329, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Fig.6, caption=
Verification of grid independence of baseline impeller, figureFileSmall=zbfUqOoMQ7RgVwcBMyqUJw==, figureFileBig=tJlrAuNAl/6Q8fN4rbz23g==, tableContent=null), ArticleFig(id=1241137061319733457, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=图6, caption=
基准叶轮网格独立性验证, figureFileSmall=zbfUqOoMQ7RgVwcBMyqUJw==, figureFileBig=tJlrAuNAl/6Q8fN4rbz23g==, tableContent=null), ArticleFig(id=1241137061395230933, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Fig.7, caption=
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基准叶轮性能曲线, figureFileSmall=67uDAxgYGLuhz5a2L34O4Q==, figureFileBig=En29m0YgspEpxcNLt0uAsg==, tableContent=null), ArticleFig(id=1241137061588168929, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Fig.8, caption=
Meridional pressure and temperature of baseline impeller, figureFileSmall=6YAAt1KaduMLvPVerdbwTg==, figureFileBig=we/Pm3Fhemv38aAwRvVuiw==, tableContent=null), ArticleFig(id=1241137061667860710, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=图8, caption=
基准叶轮子午平面的压力和温度分布, figureFileSmall=6YAAt1KaduMLvPVerdbwTg==, figureFileBig=we/Pm3Fhemv38aAwRvVuiw==, tableContent=null), ArticleFig(id=1241137061760135404, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Fig.9, caption=
Schematic diagram of self-recirculation casing treatment, figureFileSmall=aZGa+GTyh8/muePU6u+Djw==, figureFileBig=e4Wk/1ondRZFXsNkjug2xQ==, tableContent=null), ArticleFig(id=1241137061831438577, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=图9, caption=
自循环机匣处理示意, figureFileSmall=aZGa+GTyh8/muePU6u+Djw==, figureFileBig=e4Wk/1ondRZFXsNkjug2xQ==, tableContent=null), ArticleFig(id=1241137061906936055, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Fig.10, caption=
Comparison of performance curves of the SRCT impeller and the baseline impeller, figureFileSmall=i+xbFlnTKiwVMGz0eHNjCw==, figureFileBig=XxtKfXhLGj9qnKh4ANVpjA==, tableContent=null), ArticleFig(id=1241137062099874052, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=图10, caption=
SRCT叶轮和基准叶轮性能曲线对比, figureFileSmall=i+xbFlnTKiwVMGz0eHNjCw==, figureFileBig=XxtKfXhLGj9qnKh4ANVpjA==, tableContent=null), ArticleFig(id=1241137063651766541, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Fig.11, caption=
Comparison of efficiency curves before and after SRCT optimization, figureFileSmall=fmdybOsrctk8KgHVdwp2pw==, figureFileBig=OpFIzfql+PJbACZBtMAIKQ==, tableContent=null), ArticleFig(id=1241137063739846929, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=图11, caption=
SRCT优化前后效率曲线对比, figureFileSmall=fmdybOsrctk8KgHVdwp2pw==, figureFileBig=OpFIzfql+PJbACZBtMAIKQ==, tableContent=null), ArticleFig(id=1241137063802761493, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Fig.12, caption=
Comparison of impeller efficiency curves at different sweep angles, figureFileSmall=Qp2tqOPKh2NrQxrkW3SQ8Q==, figureFileBig=mhSXLUMBD7b5kMmeOlZUKw==, tableContent=null), ArticleFig(id=1241137063882453272, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=图12, caption=
不同掠角下叶轮效率曲线对比, figureFileSmall=Qp2tqOPKh2NrQxrkW3SQ8Q==, figureFileBig=mhSXLUMBD7b5kMmeOlZUKw==, tableContent=null), ArticleFig(id=1241137064079585566, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Fig.13, caption=
Flow chart of coupling optimization, figureFileSmall=KXDxGHYIZ7FXp9t/cyStFQ==, figureFileBig=/VwX+krSAla6EcdGF97EhA==, tableContent=null), ArticleFig(id=1241137064150888739, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=图13, caption=
耦合优化流程, figureFileSmall=KXDxGHYIZ7FXp9t/cyStFQ==, figureFileBig=/VwX+krSAla6EcdGF97EhA==, tableContent=null), ArticleFig(id=1241137064213803304, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Fig.14, caption=
Comparison of performance curves of various impellers, figureFileSmall=OweF3CM470DgKFQo7IUUGA==, figureFileBig=mfhoxp71NYd0HUOH8q+qgQ==, tableContent=null), ArticleFig(id=1241137064306077997, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=图14, caption=
不同叶轮性能曲线对比, figureFileSmall=OweF3CM470DgKFQo7IUUGA==, figureFileBig=mfhoxp71NYd0HUOH8q+qgQ==, tableContent=null), ArticleFig(id=1241137064410935610, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Fig.15, caption=
Distribution of relative Mach number at 90% blade height, figureFileSmall=gIXFtmFJIB+hJh1vIMWbCw==, figureFileBig=DghMddU4CpseRMgReONhGA==, tableContent=null), ArticleFig(id=1241137064515793213, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=图15, caption=
90%叶高相对马赫数分布云图, figureFileSmall=gIXFtmFJIB+hJh1vIMWbCw==, figureFileBig=DghMddU4CpseRMgReONhGA==, tableContent=null), ArticleFig(id=1241137064633233730, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Fig.16, caption=
Velocity vectors at 90% span near the inducer of impellers, figureFileSmall=+6gcZneIZdC9qPMCqa0qDg==, figureFileBig=PqS6l6kDwoDjtt3B0qnGcQ==, tableContent=null), ArticleFig(id=1241137064742285640, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=图16, caption=
90%叶高叶片前缘速度矢量图, figureFileSmall=+6gcZneIZdC9qPMCqa0qDg==, figureFileBig=PqS6l6kDwoDjtt3B0qnGcQ==, tableContent=null), ArticleFig(id=1241137064830366028, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Fig.17, caption=
Comparison of casing treatment recirculation flow rate before and after coupling optimization, figureFileSmall=J3Bd1b5Csb9ByRti7sPOXA==, figureFileBig=75/DqEVChg+lNK2WWt7AVg==, tableContent=null), ArticleFig(id=1241137064935223635, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=图17, caption=
耦合优化前后机匣回流量对比, figureFileSmall=J3Bd1b5Csb9ByRti7sPOXA==, figureFileBig=75/DqEVChg+lNK2WWt7AVg==, tableContent=null), ArticleFig(id=1241137065035886939, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Fig.18, caption=
Comparison of subcritical zones distributions near the inducer of impellers, figureFileSmall=GHRcefkrKw84RuC+xbiRcQ==, figureFileBig=Px8VLvwGzWh/N6V8G8CRQQ==, tableContent=null), ArticleFig(id=1241137065136550238, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=图18, caption=
叶轮入口区域亚临界区分布对比, figureFileSmall=GHRcefkrKw84RuC+xbiRcQ==, figureFileBig=Px8VLvwGzWh/N6V8G8CRQQ==, tableContent=null), ArticleFig(id=1241137065228824930, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Fig.19, caption=
Isentropic efficiency distributions along the streamwise direction, figureFileSmall=TNy0tmWfKskIGscZSD6qLg==, figureFileBig=KdOLWL/9nhVkSp0C8apzDg==, tableContent=null), ArticleFig(id=1241137065321099623, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=图19, caption=
等熵效率沿流向分布, figureFileSmall=TNy0tmWfKskIGscZSD6qLg==, figureFileBig=KdOLWL/9nhVkSp0C8apzDg==, tableContent=null), ArticleFig(id=1241137065409180014, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Fig.20, caption=
Entropy distributions of different streamwise locations, figureFileSmall=gLdB4bg92HaEz3f67oNv8Q==, figureFileBig=pLlpsqq5ujhPl0gmM2OCSg==, tableContent=null), ArticleFig(id=1241137065501454709, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=图20, caption=
不同流向位置熵分布, figureFileSmall=gLdB4bg92HaEz3f67oNv8Q==, figureFileBig=pLlpsqq5ujhPl0gmM2OCSg==, tableContent=null), ArticleFig(id=1241137065606312317, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Fig.21, caption=
Comparison of negative axial velocity at 90% blade height, figureFileSmall=jRfoGHv6rbNbWxw3L2DE0w==, figureFileBig=HwIvHz+IA0zgXKRbPGvq5A==, tableContent=null), ArticleFig(id=1241137065690198405, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=图21, caption=
90%叶高负轴向速度对比, figureFileSmall=jRfoGHv6rbNbWxw3L2DE0w==, figureFileBig=HwIvHz+IA0zgXKRbPGvq5A==, tableContent=null), ArticleFig(id=1241137065769890184, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Fig.22, caption=
Static entropy distributions in meridian planes, figureFileSmall=YmvipbNKVZneKf+viGJ6Ug==, figureFileBig=teogS5kMX74y9K6NrM1vvw==, tableContent=null), ArticleFig(id=1241137065845387664, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=图22, caption=
子午面静熵分布云图, figureFileSmall=YmvipbNKVZneKf+viGJ6Ug==, figureFileBig=teogS5kMX74y9K6NrM1vvw==, tableContent=null), ArticleFig(id=1241137065950245271, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Tab.1, caption=
Geometry parameters of Sandia compressor
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 数值 | 项目 | 数值 |
|---|
| 进口轮毂半径/mm | 2.54 | 进口半径/mm | 18.98 |
| 进口轮缘半径/mm | 9.37 | 出口半径/mm | 26.00 |
| 出口半径/mm | 18.68 | 进口安装角/(°) | 42.44 |
| 叶片进口安装角/(°) | 37.13 | 出口安装角/(°) | 71.50 |
| 叶片出口安装角/(°) | –50 | 扩压器叶片数 | 17 |
| 叶片数 | 6/6 | | |
), ArticleFig(id=1241137066055102876, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=表1, caption=
Sandia压缩机几何参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 数值 | 项目 | 数值 |
|---|
| 进口轮毂半径/mm | 2.54 | 进口半径/mm | 18.98 |
| 进口轮缘半径/mm | 9.37 | 出口半径/mm | 26.00 |
| 出口半径/mm | 18.68 | 进口安装角/(°) | 42.44 |
| 叶片进口安装角/(°) | 37.13 | 出口安装角/(°) | 71.50 |
| 叶片出口安装角/(°) | –50 | 扩压器叶片数 | 17 |
| 叶片数 | 6/6 | | |
), ArticleFig(id=1241137066172543397, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Tab.2, caption=
Errors and calculation time of CO2 RGP tables with different resolutions
, figureFileSmall=null, figureFileBig=null, tableContent=
| 分辨率 | 最大相对误差/% | 计算时间/h |
|---|
| RGP1 | 100×100 | 7.86 | 3.00 |
| RGP2 | 300×300 | 4.33 | 4.50 |
| RGP3 | 500×500 | 1.45 | 5.25 |
| RGP4 | 800×800 | 0.95 | 11.25 |
), ArticleFig(id=1241137066269012392, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=表2, caption=
CO2不同分辨率RGP表的误差及计算时间
, figureFileSmall=null, figureFileBig=null, tableContent=
| 分辨率 | 最大相对误差/% | 计算时间/h |
|---|
| RGP1 | 100×100 | 7.86 | 3.00 |
| RGP2 | 300×300 | 4.33 | 4.50 |
| RGP3 | 500×500 | 1.45 | 5.25 |
| RGP4 | 800×800 | 0.95 | 11.25 |
), ArticleFig(id=1241137066352898479, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Tab.3, caption=
Preliminary design results of the baseline impeller
, figureFileSmall=null, figureFileBig=null, tableContent=
| 设计参数 | 数值 | 几何参数 | 数值 |
|---|
| 进口总温Tt1/K | 310 | 进口轮盖直径D1s/mm | 16.57 |
| 进口总压pt1/MPa | 7.5 | 进口轮毂直径D1h/mm | 1.57 |
| 设计流量m/(kg·s–1) | 2 | 出口直径D2/mm | 41.16 |
| 设计压比ε | 1.80 | 出口宽度b2/mm | 1.83 |
| 设计效率ηs | 0.85 | 进口轮盖相对气流角β1s/(°) | 60 |
| 设计转速n/(r·min–1) | 75 000 | 出口叶片安装角β2A/(°) | –10 |
| 流量系数φ2r | 0.16 | 叶顶间隙/mm | 0.20 |
| 比焓比σ | 1.06 | | |
| 进口马赫数Mc1 | 0.185 | | |
), ArticleFig(id=1241137066482921913, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=表3, caption=
基准叶轮初步设计结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 设计参数 | 数值 | 几何参数 | 数值 |
|---|
| 进口总温Tt1/K | 310 | 进口轮盖直径D1s/mm | 16.57 |
| 进口总压pt1/MPa | 7.5 | 进口轮毂直径D1h/mm | 1.57 |
| 设计流量m/(kg·s–1) | 2 | 出口直径D2/mm | 41.16 |
| 设计压比ε | 1.80 | 出口宽度b2/mm | 1.83 |
| 设计效率ηs | 0.85 | 进口轮盖相对气流角β1s/(°) | 60 |
| 设计转速n/(r·min–1) | 75 000 | 出口叶片安装角β2A/(°) | –10 |
| 流量系数φ2r | 0.16 | 叶顶间隙/mm | 0.20 |
| 比焓比σ | 1.06 | | |
| 进口马赫数Mc1 | 0.185 | | |
), ArticleFig(id=1241137066608751036, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Tab.4, caption=
Baseline values and variable ranges of casing treatment design variables
, figureFileSmall=null, figureFileBig=null, tableContent=
| 几何参数 | 下限 | 基准值 | 上限 |
|---|
| 上游抽吸口宽度X1 | 0.5 | 1.0 | 2.5 |
| 机匣高度X2 | 3.0 | 3.7 | 4.5 |
| 机匣长度X3 | 6.3 | 7.0 | 10.5 |
| 空腔高度X4 | 0.8 | 1.0 | 1.2 |
| 下游抽吸口宽度X5 | 0.5 | 1.0 | 1.5 |
), ArticleFig(id=1241137066696831426, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=表4, caption=
机匣处理设计变量基准值及变化范围
, figureFileSmall=null, figureFileBig=null, tableContent=
| 几何参数 | 下限 | 基准值 | 上限 |
|---|
| 上游抽吸口宽度X1 | 0.5 | 1.0 | 2.5 |
| 机匣高度X2 | 3.0 | 3.7 | 4.5 |
| 机匣长度X3 | 6.3 | 7.0 | 10.5 |
| 空腔高度X4 | 0.8 | 1.0 | 1.2 |
| 下游抽吸口宽度X5 | 0.5 | 1.0 | 1.5 |
), ArticleFig(id=1241137068198392263, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Tab.5, caption=
Baseline value and variable range of the leading-edge sweep angle
, figureFileSmall=null, figureFileBig=null, tableContent=
), ArticleFig(id=1241137068324221390, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=表5, caption=
前缘掠角基准值及变量范围
, figureFileSmall=null, figureFileBig=null, tableContent=
), ArticleFig(id=1241137068429078995, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=EN, label=Tab.6, caption=
Comparison of design variables before and after coupling optimization
, figureFileSmall=null, figureFileBig=null, tableContent=
| 几何参数 | 优化前 | 优化后 |
|---|
| 上游抽吸口宽度X1/mm | 1.0 | 1.9 |
| 机匣高度X2/mm | 3.7 | 3.6 |
| 机匣长度X3/mm | 7.0 | 8.2 |
| 空腔高度X4/mm | 1.0 | 0.9 |
| 下游抽吸口宽度X5/mm | 1.0 | 0.6 |
| 掠角X6/(°) | 0 | 19.6 |
), ArticleFig(id=1241137068529742295, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212059280213, language=CN, label=表6, caption=
耦合优化前后设计变量对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 几何参数 | 优化前 | 优化后 |
|---|
| 上游抽吸口宽度X1/mm | 1.0 | 1.9 |
| 机匣高度X2/mm | 3.7 | 3.6 |
| 机匣长度X3/mm | 7.0 | 8.2 |
| 空腔高度X4/mm | 1.0 | 0.9 |
| 下游抽吸口宽度X5/mm | 1.0 | 0.6 |
| 掠角X6/(°) | 0 | 19.6 |
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