Article(id=1221507474427924705, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1221507468635586855, articleNumber=null, orderNo=null, doi=10.19666/j.rlfd.202212288, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1670515200000, receivedDateStr=2022-12-09, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1769159676415, onlineDateStr=2026-01-23, pubDate=1687622400000, pubDateStr=2023-06-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1769159676415, onlineIssueDateStr=2026-01-23, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1769159676415, creator=13701087609, updateTime=1769159676415, updator=13701087609, issue=Issue{id=1221507468635586855, tenantId=1146029695717560320, journalId=1210938733613449225, year='2023', volume='52', issue='6', pageStart='1', pageEnd='172', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1769159675034, creator=13701087609, updateTime=1769166411362, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1221535722931216843, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1221507468635586855, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1221535722931216844, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1221507468635586855, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=52, endPage=62, ext={EN=ArticleExt(id=1221507474679582959, articleId=1221507474427924705, tenantId=1146029695717560320, journalId=1210938733613449225, language=EN, title=Comparative study of flow characteristics between carbon dioxide and steam in cascade passage, columnId=1221507469394755881, journalTitle=Thermal Power Generation, columnName=Fundamental research on fluid characteristics of S-CO2 cycle, runingTitle=null, highlight=null, articleAbstract=

In order to explore the similarities and differences of the loss characteristics of carbon dioxide and steam in turbine cascades, the flow characteristics of the two kinds of working fluids in stator cascade and stage were studied by numerical methods. And the optimal Mach number for efficient operation of turbine stage under subsonic condition was obtained. The results show that with the increase of Mach number, the flow loss first increases and then decreases. When the Mach number is lower, the diffuser has a large range and is easy to backflow, which makes the wall boundary layer thicken and separate, and increases the overall flow loss. When the Mach number is higher, the strength of the secondary vortex in passage is larger, and the shock wave will be generated near the trailing edge of blades. The reason for the larger flow loss is the secondary flow and shock wave. Compared with steam, the dynamic viscosity of carbon dioxide is slightly higher, and its density is about twice that of steam. Under the same Mach number condition, the mainstream velocity is lower, the boundary layer is thicker, and the overall loss is larger. When the Mach number is lower than 0.30, the total-total efficiency of turbine stages with carbon dioxide is lower. While the Mach number is higher than 0.50, the efficiency of carbon dioxide is slightly higher than that of steam. When the optimal outlet Mach number of balde is about 0.60, the efficiency of both is the highest. The research results will provide a reference for further improving the design level for axial flow turbines of steam and carbon dioxide, and further understanding the loss characteristics of different medium in turbine stage.

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为探究二氧化碳和水蒸气工质在透平叶栅中损失特性的异同,采用数值方法研究了2种工质在轴流透平静叶栅以及级内的流动特性,获得了亚音速条件下透平级高效运行的最佳马赫数。结果表明:随着马赫数增大,流动损失先增大后减小;当马赫数较低时,扩压段范围较大且易回流,使得壁面边界层增厚并分离,总体流动损失增大;当马赫数较高时,通道内二次流强度较大,且在叶片尾缘附近产生激波,其流动损失主要源于二次流和激波;与水蒸气相比,二氧化碳的动力黏度略大,密度约是水蒸气的2倍,在相同马赫数时其主流速度较低,边界层较厚,因此在马赫数较低时其壁面摩擦损失较大,总体损失较大;马赫数低于0.30时,以二氧化碳为工质的透平级总总等熵效率较低,马赫数高于0.50时,二氧化碳的效率略高于水蒸气;在叶型最佳出口马赫数约为0.60时,2种介质在级环境下的总总等熵效率均达到最高。该研究结果将为进一步提高水蒸气和二氧化碳轴流透平的设计水平以及深入理解不同介质在透平级内的流动特性提供参考。

, correspAuthors=null, authorNote=null, correspAuthorsNote=
邓清华(1975),男,博士,副教授,主要研究方向为叶轮机械气动热力学,
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杨国英(1997),男,博士研究生,主要研究方向为超临界二氧化碳轴流透平优化设计,

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杨国英(1997),男,博士研究生,主要研究方向为超临界二氧化碳轴流透平优化设计,

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杨国英(1997),男,博士研究生,主要研究方向为超临界二氧化碳轴流透平优化设计,

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二氧化碳和水蒸气在叶栅通道内的流动特性对比
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杨国英 1 , 邓清华 1 , 徐伯洲 1 , 张永海 2 , 李军 1 , 丰镇平 1
热力发电 | 超临界二氧化碳循环工质特性基础研究 2023,52(6): 52-62
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热力发电 | 超临界二氧化碳循环工质特性基础研究 2023, 52(6): 52-62
二氧化碳和水蒸气在叶栅通道内的流动特性对比
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杨国英1 , 邓清华1 , 徐伯洲1, 张永海2, 李军1, 丰镇平1
作者信息
  • 1.西安交通大学能源与动力工程学院,陕西 西安 710049
  • 2.西安热工研究院有限公司,陕西 西安 710054
  • 杨国英(1997),男,博士研究生,主要研究方向为超临界二氧化碳轴流透平优化设计,

通讯作者:

邓清华(1975),男,博士,副教授,主要研究方向为叶轮机械气动热力学,
Comparative study of flow characteristics between carbon dioxide and steam in cascade passage
Guoying YANG1 , Qinghua DENG1 , Bozhou XU1, Yonghai ZHANG2, Jun LI1, Zhenping FENG1
Affiliations
  • 1.School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
  • 2.Xi'an Thermal Power Research Institute Co. Ltd., Xi'an 710054, China
出版时间: 2023-06-25 doi: 10.19666/j.rlfd.202212288
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为探究二氧化碳和水蒸气工质在透平叶栅中损失特性的异同,采用数值方法研究了2种工质在轴流透平静叶栅以及级内的流动特性,获得了亚音速条件下透平级高效运行的最佳马赫数。结果表明:随着马赫数增大,流动损失先增大后减小;当马赫数较低时,扩压段范围较大且易回流,使得壁面边界层增厚并分离,总体流动损失增大;当马赫数较高时,通道内二次流强度较大,且在叶片尾缘附近产生激波,其流动损失主要源于二次流和激波;与水蒸气相比,二氧化碳的动力黏度略大,密度约是水蒸气的2倍,在相同马赫数时其主流速度较低,边界层较厚,因此在马赫数较低时其壁面摩擦损失较大,总体损失较大;马赫数低于0.30时,以二氧化碳为工质的透平级总总等熵效率较低,马赫数高于0.50时,二氧化碳的效率略高于水蒸气;在叶型最佳出口马赫数约为0.60时,2种介质在级环境下的总总等熵效率均达到最高。该研究结果将为进一步提高水蒸气和二氧化碳轴流透平的设计水平以及深入理解不同介质在透平级内的流动特性提供参考。

水蒸气  /  二氧化碳  /  透平级  /  马赫数  /  流动特性

In order to explore the similarities and differences of the loss characteristics of carbon dioxide and steam in turbine cascades, the flow characteristics of the two kinds of working fluids in stator cascade and stage were studied by numerical methods. And the optimal Mach number for efficient operation of turbine stage under subsonic condition was obtained. The results show that with the increase of Mach number, the flow loss first increases and then decreases. When the Mach number is lower, the diffuser has a large range and is easy to backflow, which makes the wall boundary layer thicken and separate, and increases the overall flow loss. When the Mach number is higher, the strength of the secondary vortex in passage is larger, and the shock wave will be generated near the trailing edge of blades. The reason for the larger flow loss is the secondary flow and shock wave. Compared with steam, the dynamic viscosity of carbon dioxide is slightly higher, and its density is about twice that of steam. Under the same Mach number condition, the mainstream velocity is lower, the boundary layer is thicker, and the overall loss is larger. When the Mach number is lower than 0.30, the total-total efficiency of turbine stages with carbon dioxide is lower. While the Mach number is higher than 0.50, the efficiency of carbon dioxide is slightly higher than that of steam. When the optimal outlet Mach number of balde is about 0.60, the efficiency of both is the highest. The research results will provide a reference for further improving the design level for axial flow turbines of steam and carbon dioxide, and further understanding the loss characteristics of different medium in turbine stage.

steam  /  carbon dioxide  /  turbine stage  /  Mach number  /  flow characteristics
杨国英, 邓清华, 徐伯洲, 张永海, 李军, 丰镇平. 二氧化碳和水蒸气在叶栅通道内的流动特性对比. 热力发电, 2023 , 52 (6) : 52 -62 . DOI: 10.19666/j.rlfd.202212288
Guoying YANG, Qinghua DENG, Bozhou XU, Yonghai ZHANG, Jun LI, Zhenping FENG. Comparative study of flow characteristics between carbon dioxide and steam in cascade passage[J]. Thermal Power Generation, 2023 , 52 (6) : 52 -62 . DOI: 10.19666/j.rlfd.202212288
  • 国家自然科学基金联合基金资助项目(U20A20303)
  • 项目(2017YFB0601804)
2023年第52卷第6期
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文章信息
doi: 10.19666/j.rlfd.202212288
  • 接收时间:2022-12-09
  • 首发时间:2026-01-23
  • 出版时间:2023-06-25
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出版历史
  • 收稿日期:2022-12-09
基金
National Natural Science Foundation of China(U20A20303)
国家自然科学基金联合基金资助项目(U20A20303)
National Key Research and Development Program of China(2017YFB0601804)
项目(2017YFB0601804)
作者信息
    1.西安交通大学能源与动力工程学院,陕西 西安 710049
    2.西安热工研究院有限公司,陕西 西安 710054

通讯作者:

邓清华(1975),男,博士,副教授,主要研究方向为叶轮机械气动热力学,
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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