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Steam ejector technology integrated into combined heat and power systems enables effective thermal-electric decoupling and deep load following, with ejector performance directly influencing overall efficiency and operational stability. A one-dimensional thermodynamic design model for high-temperature and high-pressure steam ejectors is developed by incorporating the development characteristics of the compressible mixing layer. The concept of compressible mixing layer thickness is introduced based on the entrainment mechanism to determine the radial dimensions of the ejector. Numerical simulations are performed to evaluate ejector performance and flow field characteristics, which guide the optimization of axial dimensions. The optimal structural parameters are identified as a nozzle-to-mixing chamber distance of 6 mm, a mixing chamber length of 42 mm, and a diffuser angle of 4.4°. An experimental system is constructed to validate the proposed design method, and the results show an average relative error of 6.6% between the predicted and measured entrainment ratios, demonstrating the model’s accuracy. The results provide a theoretical foundation for the structural design of high-temperature and high-pressure steam ejectors and hold significant potential for practical engineering applications.
, authors=Yumeng GUO
1, 2, Suxia MA
2, 3, Jingxian ZHANG
2, Jiajie ZHANG
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热电联产机组耦合蒸汽引射器技术能够有效实现热电联产解耦及深度电力调峰。作为系统核心部件,蒸汽引射器的性能直接影响机组运行效率和稳定性。首先针对高温高压蒸汽引射器,提出了一维热力学设计模型,该模型考虑可压缩混合层发展特点,首次基于混合卷吸机理,引入可压缩混合层厚度概念,确定引射器的径向尺寸;然后采用数值模拟分析引射器性能及流场特性,进一步优化轴向尺寸,推荐最优结构为:喷嘴距6 mm、混合室长度42 mm、扩压室角度4.4°;最后搭建实验系统验证设计方法,基于设计方法设计的引射器的引射系数与实验值的平均相对误差为6.6%,验证了设计方法的准确性。研究结果可为高温高压蒸汽引射器的结构设计提供理论指导,具有重要的工程应用价值。
, authors=郭宇朦
1, 2, 马素霞
2, 3, 张敬贤
2, 张嘉杰
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Schematic diagram of ejector modeling, figureFileSmall=CYfgXVXHRs3D2nlFUcqP3A==, figureFileBig=Cdz23Cd11C1zVALbgPp4tw==, tableContent=null), ArticleFig(id=1295065061299606032, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=CN, label=图1, caption=
蒸汽引射器结构示意, figureFileSmall=CYfgXVXHRs3D2nlFUcqP3A==, figureFileBig=Cdz23Cd11C1zVALbgPp4tw==, tableContent=null), ArticleFig(id=1295065062524342802, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=EN, label=Fig.2, caption=
Schematic of mixing layer boundary development, figureFileSmall=pDahMaFs3vhHKtepwWEkkg==, figureFileBig=76s3Zwn8Eeb7KJaC6HCdqg==, tableContent=null), ArticleFig(id=1295065062981521940, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=CN, label=图2, caption=
混合层发展规律, figureFileSmall=pDahMaFs3vhHKtepwWEkkg==, figureFileBig=76s3Zwn8Eeb7KJaC6HCdqg==, tableContent=null), ArticleFig(id=1295065063392563733, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=EN, label=Fig.3, caption=
Change trends of entrainment ratio and pressure recovery ratio with nozzle exit position, figureFileSmall=f2mEiDDfGg/ZwAevMy4quw==, figureFileBig=OPyoq1hG6gtaCvJy6fobNg==, tableContent=null), ArticleFig(id=1295065063786828310, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=CN, label=图3, caption=
引射系数和升压比随喷嘴距变化趋势, figureFileSmall=f2mEiDDfGg/ZwAevMy4quw==, figureFileBig=OPyoq1hG6gtaCvJy6fobNg==, tableContent=null), ArticleFig(id=1295065063879102999, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=EN, label=Fig.4, caption=
Mach number contours at different nozzle exit positions, figureFileSmall=3+ZQus6nHRtd/XrCt3TCuA==, figureFileBig=vZzVFYLtGXmeiC15jn1Kbg==, tableContent=null), ArticleFig(id=1295065065716208154, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=CN, label=图4, caption=
不同喷嘴距条件下的马赫数分布, figureFileSmall=3+ZQus6nHRtd/XrCt3TCuA==, figureFileBig=vZzVFYLtGXmeiC15jn1Kbg==, tableContent=null), ArticleFig(id=1295065065812677148, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=EN, label=Fig.5, caption=
Change trends of entrainment ratio and pressure recovery ratio with mixing chamber length, figureFileSmall=TOnyKgshYcYbGcKF7T2KRQ==, figureFileBig=WGuRlBgXhuqYWjkLMpfC0Q==, tableContent=null), ArticleFig(id=1295065065967866398, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=CN, label=图5, caption=
引射系数和升压比随混合室长度变化趋势, figureFileSmall=TOnyKgshYcYbGcKF7T2KRQ==, figureFileBig=WGuRlBgXhuqYWjkLMpfC0Q==, tableContent=null), ArticleFig(id=1295065066055946783, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=EN, label=Fig.6, caption=
Mach number contours with different lengths of the mixing chamber, figureFileSmall=ZrlcrKuNU6CX13VFKtMCfA==, figureFileBig=B0iws1sEKTBKcDhr0dwRwQ==, tableContent=null), ArticleFig(id=1295065066290827808, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=CN, label=图6, caption=
不同混合室长度条件下的马赫数分布, figureFileSmall=ZrlcrKuNU6CX13VFKtMCfA==, figureFileBig=B0iws1sEKTBKcDhr0dwRwQ==, tableContent=null), ArticleFig(id=1295065066378908193, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=EN, label=Fig.7, caption=
Change trends of entrainment ratio and pressure recovery ratio with diffuser angles, figureFileSmall=v5JApgdD+WSztGDjtdgNuw==, figureFileBig=fKrqxXMmUz5XkBUhKu7bSA==, tableContent=null), ArticleFig(id=1295065066458599970, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=CN, label=图7, caption=
引射系数和升压比随扩压室角度变化趋势, figureFileSmall=v5JApgdD+WSztGDjtdgNuw==, figureFileBig=fKrqxXMmUz5XkBUhKu7bSA==, tableContent=null), ArticleFig(id=1295065066718646820, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=EN, label=Fig.8, caption=
Mach number contours with different diffuser angles, figureFileSmall=HgOuf/fJNzC8PmT0nxGAqg==, figureFileBig=aTeV9A1Bv3ix0qm6qT4RZA==, tableContent=null), ArticleFig(id=1295065066819310117, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=CN, label=图8, caption=
不同扩压室角度下马赫数分布, figureFileSmall=HgOuf/fJNzC8PmT0nxGAqg==, figureFileBig=aTeV9A1Bv3ix0qm6qT4RZA==, tableContent=null), ArticleFig(id=1295065067138077222, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=EN, label=Fig.9, caption=
Schematic diagram of the high-temperature and high-pressure steam ejector experimental system, figureFileSmall=iyA2bTHf8NyEpMDSvqHxmA==, figureFileBig=r6Az2YH84KbAaCo6Vauuzg==, tableContent=null), ArticleFig(id=1295065067557507624, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=CN, label=图9, caption=
高温高压蒸汽引射器实验系统示意, figureFileSmall=iyA2bTHf8NyEpMDSvqHxmA==, figureFileBig=r6Az2YH84KbAaCo6Vauuzg==, tableContent=null), ArticleFig(id=1295065067993715241, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=EN, label=Fig.10, caption=
Photographs of the high-temperature and high-pressure steam ejector experimental system, figureFileSmall=gQvoWj7160kEBqAzD1Pxwg==, figureFileBig=Qbe2SXW9uIazvKgaPuUxVw==, tableContent=null), ArticleFig(id=1295065068484448811, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=CN, label=图10, caption=
高温高压蒸汽引射器实验系统照片, figureFileSmall=gQvoWj7160kEBqAzD1Pxwg==, figureFileBig=Qbe2SXW9uIazvKgaPuUxVw==, tableContent=null), ArticleFig(id=1295065070157976109, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=EN, label=Fig.11, caption=
Change of the entrainment ratio with back pressure, figureFileSmall=VjJLZvkyHSsUGH+o+vQqDQ==, figureFileBig=f7wmnveeh0O5wR/VNBX17Q==, tableContent=null), ArticleFig(id=1295065070246056495, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=CN, label=图11, caption=
引射系数随背压变化趋势, figureFileSmall=VjJLZvkyHSsUGH+o+vQqDQ==, figureFileBig=f7wmnveeh0O5wR/VNBX17Q==, tableContent=null), ArticleFig(id=1295065070489326128, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=EN, label=Fig.12, caption=
Error distribution of the entrainment ratio under variable operating conditions, figureFileSmall=CbIYzYBXwP0dwmuoKSXqzg==, figureFileBig=jF1C1hVESlT2P+tirvNF4Q==, tableContent=null), ArticleFig(id=1295065070581600817, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=CN, label=图12, caption=
变工况条件下引射系数误差分布, figureFileSmall=CbIYzYBXwP0dwmuoKSXqzg==, figureFileBig=jF1C1hVESlT2P+tirvNF4Q==, tableContent=null), ArticleFig(id=1295065070950699570, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=EN, label=Tab.1, caption=
Design condition of the steam ejector in a power plant
, figureFileSmall=null, figureFileBig=null, tableContent=
| 工作条件 | 压力/MPa | 温度/℃ |
|---|
| 工作蒸汽 | 11.7 | 500 |
| 引射蒸汽 | 3.0 | 318 |
| 混合蒸汽 | 3.8~4.0 | 380~450 |
), ArticleFig(id=1295065071030391347, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=CN, label=表1, caption=
某电厂蒸汽引射器设计工况
, figureFileSmall=null, figureFileBig=null, tableContent=
| 工作条件 | 压力/MPa | 温度/℃ |
|---|
| 工作蒸汽 | 11.7 | 500 |
| 引射蒸汽 | 3.0 | 318 |
| 混合蒸汽 | 3.8~4.0 | 380~450 |
), ArticleFig(id=1295065071437238837, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=EN, label=Tab.2, caption=
Comparison between the predicted and measured geometrical parameters the for the steam ejector
, figureFileSmall=null, figureFileBig=null, tableContent=
| 结构参数 | 实验值/mm | 计算值/mm | 误差/% |
|---|
| 喷管进口直径 | 101 | 103.51 | 2.485 |
| 喷管出口直径 | 72 | 74.11 | 2.931 |
| 混合室直径 | 126 | 123.97 | –1.611 |
| 扩压室出口直径 | 315 | 311.66 | –1.060 |
), ArticleFig(id=1295065071760200246, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=CN, label=表2, caption=
本文热力学设计模型预测结果与a现场蒸汽引射器几何结构参数对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 结构参数 | 实验值/mm | 计算值/mm | 误差/% |
|---|
| 喷管进口直径 | 101 | 103.51 | 2.485 |
| 喷管出口直径 | 72 | 74.11 | 2.931 |
| 混合室直径 | 126 | 123.97 | –1.611 |
| 扩压室出口直径 | 315 | 311.66 | –1.060 |
), ArticleFig(id=1295065071835697719, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=EN, label=Tab.3, caption=
Design condition of the steam ejector in this study
, figureFileSmall=null, figureFileBig=null, tableContent=
| 工作条件 | 压力/MPa | 温度/℃ |
|---|
| 工作蒸汽 | 11.0 | 500 |
| 引射蒸汽 | 2.5 | 250 |
), ArticleFig(id=1295065071898612280, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=CN, label=表3, caption=
本文蒸汽引射器设计工况
, figureFileSmall=null, figureFileBig=null, tableContent=
| 工作条件 | 压力/MPa | 温度/℃ |
|---|
| 工作蒸汽 | 11.0 | 500 |
| 引射蒸汽 | 2.5 | 250 |
), ArticleFig(id=1295065072175436345, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=EN, label=Tab.4, caption=
Structural dimensions of the ejector determined by the proposed design method
, figureFileSmall=null, figureFileBig=null, tableContent=
| 结构参数 | 数值 |
|---|
| 喷管入口半径 | 4.74 |
| 喷管喉部半径 | 2.08 |
| 喷管出口半径 | 2.74 |
| 喷嘴距 | 6.00 |
| 混合室直径 | 4.98 |
| 混合室长度 | 42.00 |
| 扩压室长度 | 95.29 |
| 扩压室出口直径 | 19.64 |
), ArticleFig(id=1295065072271905338, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=CN, label=表4, caption=
本文设计方法确定的引射器结构尺寸
, figureFileSmall=null, figureFileBig=null, tableContent=
| 结构参数 | 数值 |
|---|
| 喷管入口半径 | 4.74 |
| 喷管喉部半径 | 2.08 |
| 喷管出口半径 | 2.74 |
| 喷嘴距 | 6.00 |
| 混合室直径 | 4.98 |
| 混合室长度 | 42.00 |
| 扩压室长度 | 95.29 |
| 扩压室出口直径 | 19.64 |
), ArticleFig(id=1295065072347402812, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=EN, label=Tab.5, caption=
Comparison of area ratios: calculated by the proposed model, the one in reference [21], versus the experimental data in reference [6]
, figureFileSmall=null, figureFileBig=null, tableContent=
| 编号 | 工作压力/kPa | 引射压力/Pa | 背压/kPa | 文献[6]实验值 | 文献[21]误差/% | 本文误差/% |
|---|
| 1 | 604 | 104 710 | 40 | 9.83 | 1.473 | 0.875 |
| 2 | 604 | 120 540 | 40 | 8.25 | –3.010 | –1.806 |
| 3 | 604 | 127 630 | 40 | 7.26 | –4.790 | –4.766 |
| 4 | 604 | 126 780 | 40 | 7.73 | –5.300 | –5.201 |
| 5 | 604 | 142 300 | 40 | 6.44 | –7.730 | –4.271 |
| 6 | 538 | 107 670 | 40 | 8.28 | 0.493 | 0.374 |
| 7 | 538 | 122 180 | 40 | 6.99 | –0.950 | –0.458 |
| 8 | 538 | 128 050 | 40 | 6.44 | –4.290 | –3.711 |
| 9 | 465 | 102 180 | 40 | 7.73 | 1.466 | 1.255 |
| 10 | 400 | 91 212 | 40 | 7.73 | –1.710 | –1.242 |
| 11 | 604 | 105 080 | 47 | 9.83 | 4.098 | 2.757 |
| 12 | 604 | 110 300 | 47 | 9.41 | 1.404 | 0.893 |
| 13 | 604 | 129 770 | 47 | 7.26 | –0.790 | –0.496 |
| 14 | 538 | 116 120 | 47 | 7.73 | 1.791 | 1.578 |
| 15 | 538 | 130 640 | 47 | 6.44 | –1.530 | –0.978 |
| 16 | 465 | 90 559 | 47 | 9.41 | 3.783 | 3.751 |
| 17 | 465 | 116 120 | 47 | 6.44 | –2.910 | –2.531 |
| 18 | 400 | 80 595 | 47 | 9.41 | 2.940 | 2.561 |
| 19 | 400 | 91 541 | 47 | 7.73 | 6.314 | 5.718 |
), ArticleFig(id=1295065072586478141, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295065035680797104, language=CN, label=表5, caption=
本文模型及文献[21]设计模型的面积比计算值与文献[6]实验值比较
, figureFileSmall=null, figureFileBig=null, tableContent=
| 编号 | 工作压力/kPa | 引射压力/Pa | 背压/kPa | 文献[6]实验值 | 文献[21]误差/% | 本文误差/% |
|---|
| 1 | 604 | 104 710 | 40 | 9.83 | 1.473 | 0.875 |
| 2 | 604 | 120 540 | 40 | 8.25 | –3.010 | –1.806 |
| 3 | 604 | 127 630 | 40 | 7.26 | –4.790 | –4.766 |
| 4 | 604 | 126 780 | 40 | 7.73 | –5.300 | –5.201 |
| 5 | 604 | 142 300 | 40 | 6.44 | –7.730 | –4.271 |
| 6 | 538 | 107 670 | 40 | 8.28 | 0.493 | 0.374 |
| 7 | 538 | 122 180 | 40 | 6.99 | –0.950 | –0.458 |
| 8 | 538 | 128 050 | 40 | 6.44 | –4.290 | –3.711 |
| 9 | 465 | 102 180 | 40 | 7.73 | 1.466 | 1.255 |
| 10 | 400 | 91 212 | 40 | 7.73 | –1.710 | –1.242 |
| 11 | 604 | 105 080 | 47 | 9.83 | 4.098 | 2.757 |
| 12 | 604 | 110 300 | 47 | 9.41 | 1.404 | 0.893 |
| 13 | 604 | 129 770 | 47 | 7.26 | –0.790 | –0.496 |
| 14 | 538 | 116 120 | 47 | 7.73 | 1.791 | 1.578 |
| 15 | 538 | 130 640 | 47 | 6.44 | –1.530 | –0.978 |
| 16 | 465 | 90 559 | 47 | 9.41 | 3.783 | 3.751 |
| 17 | 465 | 116 120 | 47 | 6.44 | –2.910 | –2.531 |
| 18 | 400 | 80 595 | 47 | 9.41 | 2.940 | 2.561 |
| 19 | 400 | 91 541 | 47 | 7.73 | 6.314 | 5.718 |
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