Article(id=1222513212541625194, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1222513210519970621, articleNumber=null, orderNo=null, doi=10.19666/j.rlfd.202301004, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1674057600000, receivedDateStr=2023-01-19, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1769399463067, onlineDateStr=2026-01-26, pubDate=1700841600000, pubDateStr=2023-11-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1769399463067, onlineIssueDateStr=2026-01-26, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1769399463067, creator=13701087609, updateTime=1769399463067, updator=13701087609, issue=Issue{id=1222513210519970621, tenantId=1146029695717560320, journalId=1210938733613449225, year='2023', volume='52', issue='11', pageStart='1', pageEnd='198', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1769399462585, creator=13701087609, updateTime=1769405983425, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1222540560984957089, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1222513210519970621, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1222540560984957090, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1222513210519970621, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=37, endPage=45, ext={EN=ArticleExt(id=1222513212847809404, articleId=1222513212541625194, tenantId=1146029695717560320, journalId=1210938733613449225, language=EN, title=Simulation and experimental research on heat exchange performance of supercritical CO2 in helical tube, columnId=1222513211350442816, journalTitle=Thermal Power Generation, columnName=Special topic on supercritical carbon dioxide cycle power generation technology, runingTitle=null, highlight=null, articleAbstract=

Numerical and experimental studies are conducted on convective heat transfer performance of carbon dioxide (S-CO2) flowing in a heated vertical helically coiled tube under supercritical pressure. The influence of flow characteristics and structural characteristics such as heat flux q, mass flow rate G, pitch P, tube inner diameter d, and spiral radius R on heat transfer are discussed, and the sensitivity of each structural parameter is studied quantitatively. A closed-loop S-CO2 test platform was built to conduct experimental research on the convective heat transfer performance of S-CO2 in the helically coiled tube, and the accuracy of the numerical simulation is verified based on the experimental data. Finally, the heat transfer correlation of S-CO2 is fitted. The research has laid foundation for the thermal design method of S-CO2 spiral-wound heat exchanger, and has certain engineering application value for the application and promotion of the spiral-wound S-CO2 heat exchangers in nuclear power and solar thermal power generations.

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对超临界二氧化碳(S-CO2)在螺旋管内的对流换热性能进行模拟和试验研究。探讨了热流密度q、质量流量G、节距P、管内径d、螺旋半径R等流动、结构特性对流动传热的影响,并对各结构特性灵敏度做了量化分析;搭建了闭式循环的S-CO2测试平台,对螺旋管内S-CO2对流换热性能进行了试验研究,并基于试验工况数据验证了数值模拟的准确性;对数据进行处理,拟合出了S-CO2的传热关联式。该研究为S-CO2螺旋管式换热器的热力设计方法奠定了基础,并在核电及光热发电领域具有一定的工程应用价值。

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夏春杰(1989),女,硕士,工程师,主要研究方向为换热器设备设计、传热传质,

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夏春杰(1989),女,硕士,工程师,主要研究方向为换热器设备设计、传热传质,

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夏春杰(1989),女,硕士,工程师,主要研究方向为换热器设备设计、传热传质,

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caption=

The first set of simulation parameters

, figureFileSmall=null, figureFileBig=null, tableContent=
P/mmd/mmR/mmS/mmq/(kW·m–2)G/(kg·h–1)
304.57401 00040、50、6017.88
4020.67
5023.67
6026.61
), ArticleFig(id=1241137065501454710, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212541625194, language=CN, label=表1, caption=

第1组模拟参数

, figureFileSmall=null, figureFileBig=null, tableContent=
P/mmd/mmR/mmS/mmq/(kW·m–2)G/(kg·h–1)
304.57401 00040、50、6017.88
4020.67
5023.67
6026.61
), ArticleFig(id=1241137065606312318, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212541625194, language=EN, label=Tab.2, caption=

The second group of simulation parameters

, figureFileSmall=null, figureFileBig=null, tableContent=
P/mmd/mmR/mmS/mmq/(kW·m–2)G/(kg·h–1)
502.80401 00040、50、6017.88
3.6020.67
4.5723.67
5.5026.61
), ArticleFig(id=1241137065690198404, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212541625194, language=CN, label=表2, caption=

第2组模拟参数

, figureFileSmall=null, figureFileBig=null, tableContent=
P/mmd/mmR/mmS/mmq/(kW·m–2)G/(kg·h–1)
502.80401 00040、50、6017.88
3.6020.67
4.5723.67
5.5026.61
), ArticleFig(id=1241137065774084489, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212541625194, language=EN, label=Tab.3, caption=

The third group of simulation parameters

, figureFileSmall=null, figureFileBig=null, tableContent=
P/mmd/mmR/mmS/mmq/(kW·m–2)G/(kg·h–1)
504.57201 00040、50、6017.88
3020.67
4023.67
5026.61
), ArticleFig(id=1241137065870553490, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212541625194, language=CN, label=表3, caption=

第3组模拟参数

, figureFileSmall=null, figureFileBig=null, tableContent=
P/mmd/mmR/mmS/mmq/(kW·m–2)G/(kg·h–1)
504.57201 00040、50、6017.88
3020.67
4023.67
5026.61
), ArticleFig(id=1241137065950245272, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212541625194, language=EN, label=Tab.4, caption=

Sensitivity values of each structural characteristic to h and Tout

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热流密度/(kW·m–2)对象结构参数
PdR
40h0.018 340.094 630.019 73
Tout0.000 150.007 490.000 52
50h0.017 330.109 890.006 23
Tout0.000 450.016 340.001 56
60h0.020 110.111 040.005 61
Tout0.000 980.033 030.003 89
), ArticleFig(id=1241137066063491485, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513212541625194, language=CN, label=表4, caption=

各结构特性对h、Tout的灵敏度值

, figureFileSmall=null, figureFileBig=null, tableContent=
热流密度/(kW·m–2)对象结构参数
PdR
40h0.018 340.094 630.019 73
Tout0.000 150.007 490.000 52
50h0.017 330.109 890.006 23
Tout0.000 450.016 340.001 56
60h0.020 110.111 040.005 61
Tout0.000 980.033 030.003 89
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螺旋管内超临界二氧化碳换热性能的模拟和试验研究
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夏春杰 , 宋嘉梁 , 陈永东 , 吴晓红
热力发电 | 超临界二氧化碳循环发电技术专题 2023,52(11): 37-45
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热力发电 | 超临界二氧化碳循环发电技术专题 2023, 52(11): 37-45
螺旋管内超临界二氧化碳换热性能的模拟和试验研究
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夏春杰 , 宋嘉梁, 陈永东, 吴晓红
作者信息
  • 合肥通用机械研究院有限公司,安徽 合肥 230031
  • 夏春杰(1989),女,硕士,工程师,主要研究方向为换热器设备设计、传热传质,

Simulation and experimental research on heat exchange performance of supercritical CO2 in helical tube
Chunjie XIA , Jialiang SONG, Yongdong CHEN, Xiaohong WU
Affiliations
  • Hefei General Machinery Research Institute Co, Ltd, Hefei 230031, China
出版时间: 2023-11-25 doi: 10.19666/j.rlfd.202301004
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对超临界二氧化碳(S-CO2)在螺旋管内的对流换热性能进行模拟和试验研究。探讨了热流密度q、质量流量G、节距P、管内径d、螺旋半径R等流动、结构特性对流动传热的影响,并对各结构特性灵敏度做了量化分析;搭建了闭式循环的S-CO2测试平台,对螺旋管内S-CO2对流换热性能进行了试验研究,并基于试验工况数据验证了数值模拟的准确性;对数据进行处理,拟合出了S-CO2的传热关联式。该研究为S-CO2螺旋管式换热器的热力设计方法奠定了基础,并在核电及光热发电领域具有一定的工程应用价值。

螺旋管式换热器  /  超临界二氧化碳布雷顿循环  /  换热性能  /  数值模拟

Numerical and experimental studies are conducted on convective heat transfer performance of carbon dioxide (S-CO2) flowing in a heated vertical helically coiled tube under supercritical pressure. The influence of flow characteristics and structural characteristics such as heat flux q, mass flow rate G, pitch P, tube inner diameter d, and spiral radius R on heat transfer are discussed, and the sensitivity of each structural parameter is studied quantitatively. A closed-loop S-CO2 test platform was built to conduct experimental research on the convective heat transfer performance of S-CO2 in the helically coiled tube, and the accuracy of the numerical simulation is verified based on the experimental data. Finally, the heat transfer correlation of S-CO2 is fitted. The research has laid foundation for the thermal design method of S-CO2 spiral-wound heat exchanger, and has certain engineering application value for the application and promotion of the spiral-wound S-CO2 heat exchangers in nuclear power and solar thermal power generations.

spiral-wound heat exchanger  /  supercritical carbon dioxide Brayton cycle  /  heat transfer performance  /  numerical simulation
夏春杰, 宋嘉梁, 陈永东, 吴晓红. 螺旋管内超临界二氧化碳换热性能的模拟和试验研究. 热力发电, 2023 , 52 (11) : 37 -45 . DOI: 10.19666/j.rlfd.202301004
Chunjie XIA, Jialiang SONG, Yongdong CHEN, Xiaohong WU. Simulation and experimental research on heat exchange performance of supercritical CO2 in helical tube[J]. Thermal Power Generation, 2023 , 52 (11) : 37 -45 . DOI: 10.19666/j.rlfd.202301004
超临界二氧化碳(supercritical carbon dioxide,S-CO2)布雷顿循环系统是非常具有潜力的能量转换方式。S-CO2在临界区物性突变现象,大大提高了效率,具有安全性高、结构简单、绿色无污染等特点,在第4代先进核能系统以及太阳能热发电等领域具有巨大的应用潜力[1-6]。换热器是S-CO2 循环系统中数量最多、体积最大、成本最高的设备,对系统效率的提高、系统安全、稳定运行具有极其重要的作用,是布雷顿循环系统中最为关键的设备之一。
目前印刷电路板式换热器(PCHE)因其设备紧凑,并能承受极端的高温高压,被众多学者提出可用于系统高低温回热器及冷却器中[7-8]。然而PCHE存在制造成本巨大、热应力大、不好清洗及难以维护等问题[9-10],且国内还未掌握高温(750 ℃以上)合金材料的蚀刻和扩散焊技术,很大程度上限制了我国S-CO2 新一代发电技术的发展。螺旋管式换热器虽占地面积有所增加,但相比PCHE,在同样高压、更高的环境下具有更好的适应性,且制造成本低、热应力更小,作为光热发电S-CO2循环系统中的主换热器具有独特的优势,被众多学者提出可用于S-CO2循环中[11-18]。目前,螺旋管内超临界流体的试验开展难度较大,国内外学者的试验研究还十分匮乏,大多以数值模拟研究为主[19-23]。在S-CO2方面,文献[24-25]的试验数据几乎被所有的研究者作为模型验证的参考,然而其研究工况与布雷顿系统换热器的参数有较大区别。仅仅依靠试验,很难深入研究螺旋管内超临界流体的特殊传热机理、结构特性影响与关联式的精度。
本文针对此薄弱环节,基于闭式循环的S-CO2测试平台和ANSYS Workbench系统,较全面系统地研究了热流密度q、质量流量G、节距P、管内径d、螺旋半径R等流动、结构特性对流动传热的影响,并对各结构参数灵敏度做了量化分析及模拟数据和试验数据的对比,拟合出了高精度的传热关联式。对螺旋管式换热器在核电以及光热发电中的应用及推广具有重要的理论意义和工程应用价值。
螺旋管结构示意如图1所示,螺旋段(被加热测试段)总长S=1 000 mm,两端直管段为过渡区。本文基于ANSYS Workbench对螺旋管进行参数化建模,主要研究了螺距P、管径d、螺旋半径R、热流密度q与质量流量G(共144组工况参数)对流动传热的影响,具体参数见表1表2表3
管内介质为8.0 MPa下的S-CO2,对应的临界温度为307.85 K,通过流体物性软件REFPROP获得S-CO2的物性参数,在Fluent中通过piecewise-liner输入变物性数据。采用RNG k-ε模型和增强壁面函数,入口质量流量为G= 17.88、20.67、23.67、26.61 kg/h,入口温度为297.99 K,壁面恒定热流密度q=40、50、60 kW/m2,出口为压力出口,采用非滑移壁面边界条件。
P=50 mm,d=4.57 mm,R=40 mm,q=50 kW/m2G=23.67 kg/h工况为例对模型网格进行无关性考核。当网格尺寸为0.2 mm时,网格数为9 190 605,节点数为3 025 374,出口温度Tout=308.6 K;当网格尺寸为0.3 mm时,网格数为3 646 206,节点数为1 272 082,出口温度Tout=309.5 K。计算误差为2.5%,故网格尺寸为0.3 mm时已满足计算要求。螺旋管入口截面网格如图2所示。
本文采用的是RNG k-ε模型,数学模型包括连续性方程、动量方程与能量方程。
连续性方程为:
xi(ρui)=0
动量方程为:
xj(ρuiuj)=xj[μeff(uixj+ujxi)23μeffukxk]pxi+ρgi
能量方程为:
xi(ρuicpT)=xi[αT(μeffTxi)]+uixj[μeff(uixj+ujxi)23μeffukxkδij]
P=50 mm,d=4.57 mm,R=40 mm,q=50 kW/m2G= 23.67 kg/h工况为例,螺旋管沿程截面上的温度分布如图3所示,L为沿程长度,周向方位与图1保持一致。
图3可以看出,内侧温度明显高于外侧,这是由于螺旋管内离心力的存在,内侧流速小于外侧流速。其不同轴向位置的壁面温度Tw与表面换热系数h的周向分布如图4所示,不同轴向位置的Twh沿流体流动方向的分布如图5所示。θ=0°、90°、180°、270°分别对应顶部、外部、底部与内部。流体温度沿流体流动方向的分布如图6所示。从图4可以看出:在周向方向上螺旋管壁面温度内部最高,外部最低,与图3保持一致;表面换热系数螺旋管内部最低,外部最高。由图6可知,当L/d=43.76、87.53、131.30、175.05时,对应的流体温度逐渐上升到临界温度附近,故在此范围内图4中的表面换热系数随L/d的增加而增加。
图5图6可以看出:当L/d=21.88~196.94时,在流体流动方向上,螺旋管壁面温度总体呈现上升、降低、上升的趋势,表面换热系数呈现上升、降低的趋势,流体温度Tf为303.2~308.5 K;当L/d=196.94时已超过临界温度区,传热出现恶化,壁面温度升高,表面换热系数下降;表面换热系数在L/d=175.05时达到峰值。
P=50 mm,d=4.57 mm,R=40 mm,q=40、50、60 kW/m2G=23.67 kg/h工况为例,流体温度Tf、表面换热系数h沿流动方向上的变化及表面换热系数随流体温度的变化如图7所示。由图7a)、图7b)可以看出:随着热流密度的增加,流体温度逐渐升高,表面换热系数逐渐降低;沿流动方向流体温度逐渐升高,表面换热系数总体呈现先上升再下降的趋势。当q=40 kW/m2时,表面换热系数在L/d=176时达到最高值;当q=60 kW/m2时,表面换热系数在L/d=155时达到最高值。这是由于当q=60 kW/m2时流体温度率先达到临界温度,表面换热系数也率先达到顶峰。从图7c)中可以看出,当流体温度位于临界温度附近,表面换热系数达到最高值。
P=50 mm,d=4.57 mm,R=40 mm,q=50 kW/m2G=17.88、20.67、23.67、26.61 kg/h工况为例,沿流动方向上流体温度Tf、壁面温度Tw、表面换热系数h的变化如图8所示。
图8可以看出:当G=17.88、20.67、23.67、26.61 kg/h时,随着质量流量的增加,流体温度略微下降,壁面温度明显下降,表面换热系数明显升高;沿流动方向流体温度呈现总体上升趋势,壁面温度总体变化不明显,表面换热系数总体呈现先上升再下降的趋势,流体温度位于临界温度附近,表面换热系数达到最高值。当G=17.88 kg/h时,表面换热系数在L/d=153时达到最高值;当G=26.61 kg/h时,表面换热系数在L/d=175时达到最高值。这是由于当G=17.88 kg/h时流体温度率先达到临界温度,表面换热系数也率先达到顶峰。
P=30、40、50、60 mm,d=4.57 mm,R=40 mm,q=50 kW/m2G=23.67 kg/h工况为例,观察节距P对流动传热的影响。沿流动方向上的流体温度Tf、壁面温度Tw与表面换热系数h的变化如图9所示。从图9中可以看出:沿流动方向流体温度呈现总体上升趋势,壁面温度总体变化不明显,表面换热系数总体呈现先上升再下降的趋势;随着节距的增加,流体温度、壁面温度、表面换热系数均变化不明显,流体温度位于临界温度附近即L/d=175时,表面换热系数达到最高值。说明节距P的变化对流动传热影响不大。
P=50 mm,d=2.80、3.60、4.57、5.50 mm,R=40 mm,q=50 kW/m2G=23.67 kg/h工况为例,观察管径d对流动传热的影响。沿流动方向上的流体温度Tf、壁面温度Tw、表面换热系数h的变化如图10所示。因d值变化,为便于比较流动方向上的变化,图10以沿程长度L作为横坐标。由图10可以看出:沿流动方向流体温度呈现总体上升趋势,壁面温度总体变化不明显,表面换热系数总体呈现先上升再下降的趋势,流体温度位于临界温度附近,表面换热系数达到最高值;随着管径的增加,流体温度上升,壁面温度下降,表面换热系数下降。当d= 5.50 mm时,表面换热系数在L=708.00 mm时达到最高值;d=2.80 mm时,表面换热系数在L=804.00 mm时达到最高值。这是由于d=5.50 mm时流体温度率先达到临界温度,表面换热系数也率先达到顶峰。
P=50 mm,d=4.57 mm,R=20、30、40、50 mm,q=50 kW/m2G=23.67 kg/h工况为例,观察螺旋半径R对流动传热的影响。沿流动方向上的流体温度Tf、壁面温度Tw、表面换热系数h的变化如图11所示。由图11可以看出:沿流动方向流体温度呈现总体上升趋势,壁面温度总体变化不明显,表面换热系数总体呈现先上升再下降的趋势,流体温度位于临界温度附近即L/d=169时,表面换热系数达到最高值;随着螺旋半径的增加,流体温度、壁面温度、表面换热系数均变化不明显。说明螺旋半径R的变化对流动传热影响不大。
为确定螺旋管各结构特性对流动传热的影响程度,需进行参数灵敏度分析,灵敏度H定义为式(4),灵敏度绝对值越大说明该结构特性对流动传热的影响程度越大。
H=(hmaxhmin)/have
式中:hmax为灵敏度的最大值;hmin为灵敏度的最小值;have为灵敏度的平均值。
q=40、50、60 kW/m2时,P、d、R对表面换热系数h、出口温度Tout的灵敏度分析如图12所示,具体数值见表4。由图12表4可以看出,dh、Tout的大小起着决定性作用,对螺旋管内的流动传热影响最大。今后对螺旋管结构优化时可优先考虑改变d值,这可为工业生产提供参考。
搭建S-CO2传热与流动性能测试平台[26]图13所示,系统原理参考文献[26]。螺旋管试件如图14所示,材料为316L不锈钢,螺旋半径R=40 mm、节距P=50 mm、管内径d=4.57 mm,螺旋段(被加热测试段)总长S=1 000 mm。加热段外壁每隔100 mm布置1个测温点,每个测温点在0°、90°、180°、270°处各布置1个热电偶,加热段共布置44个热电偶,布置完成后外壁用保温棉进行保温(图14b))。
q=40、50、60 kW/m2G=23.67 kg/h工况为例,沿流动方向上的壁面温度Tw、流体温度Tf、表面换热系数h的模拟值和试验值对比如图15所示。由图15可以看出:q=40 kW/m2时,TwTfh模拟值和试验值误差范围分别为0.22%~0.36%、0.05%~0.14%、8.70%~19.60%;q=50 kW/m2时,TwTfh模拟值和试验值误差范围分别为0.25%~0.41%、0.10%~0.20%、2.20%~6.40%;q=60 kW/m2时,TwTfh模拟值和试验值误差范围分别为0.22%~0.43%、0.10%~0.60%、0.10%~0.60%。误差均在允许的范围内,验证了数值模拟结果的可靠性。
表1表2表3中144组工况参数的计算结果进行处理,拟合出基于螺旋管曲率δ(式(5))的S-CO2努塞特数Nu关联式(式(6))。
δ=d2R
Nu=0.000 936Re1.114Pr0.527(ρwρf)0.001 6(λwλf)0.501(cp,wcp,f)0.474δ0.018 5
式中:Re为雷诺数;Pr为普朗特数;ρ为密度,kg/m3λ为导热系数,W/(m·K);cp为定压比热容,kJ/(kg·K);下标w为基于壁面温度;下标f为基于流体温度。该公式适用于15 780≤Re≤104 305,1.4≤Pr≤56,0.035≤δ≤0.11。
图16为模拟值与公式值的对比,误差在15%范围内。文献[26]基于试验拟合的关联式,误差为20%。相比文献[26]考虑了螺旋管结构特性的影响后,明显提高了拟合公式的精度。
1)通过观察螺旋管内部流场特性,发现离心力的存在强化了传热。内部温度最高,表面换热系数最低;外部温度最低,表面换热系数最高;沿流体流动方向,表面换热系数在临界温度附近达到最高值。
2)通过对不同热流密度、质量流量的传热特性分析,随着热流密度的增加,流体温度逐渐升高,表面换热系数逐渐减低;随着质量流量的增加,流体温度略微下降,壁面温度明显下降,表面换热系数明显升高。
3)通过对螺旋管结构特性的分析,发现随着节距P、螺旋半径R的增加,流体温度、壁面温度、表面换热系数均变化不明显;随着管径d的增加,流体温度上升,壁面温度下降,表面换热系数下降。
4)对螺旋管各结构特性的灵敏度进行分析,发现管径d对螺旋管流动传热影响较大,优化螺旋管结构时可优先考虑改变d值。
5)通过试验验证了数值模拟的可靠性,并拟合出基于螺旋管结构特性的传热关联式,提高了关联式的精度。
  • 安徽省自然科学基金面上项目(2008085ME152)
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2023年第52卷第11期
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doi: 10.19666/j.rlfd.202301004
  • 接收时间:2023-01-19
  • 首发时间:2026-01-26
  • 出版时间:2023-11-25
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  • 收稿日期:2023-01-19
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Anhui Provincial Natural Science Foundation General Project(2008085ME152)
安徽省自然科学基金面上项目(2008085ME152)
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    合肥通用机械研究院有限公司,安徽 合肥 230031
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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
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