Article(id=1153797766422716948, tenantId=1146029695717560320, journalId=1152916057816748034, issueId=1153797763918713083, articleNumber=null, orderNo=null, doi=10.3969/j.issn.2095-1469.2024.06.14, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1691683200000, receivedDateStr=2023-08-11, revisedDate=1697731200000, revisedDateStr=2023-10-20, acceptedDate=null, acceptedDateStr=null, onlineDate=1753016424041, onlineDateStr=2025-07-20, pubDate=null, pubDateStr=null, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1753016424041, onlineIssueDateStr=2025-07-20, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1753016424041, creator=13701087609, updateTime=1753016424041, updator=13701087609, issue=Issue{id=1153797763918713083, tenantId=1146029695717560320, journalId=1152916057816748034, year='2024', volume='14', issue='6', pageStart='921', pageEnd='1090', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=0, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=0, createTime=1753016423444, creator=13701087609, updateTime=1757481666824, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1172526352126325142, tenantId=1146029695717560320, journalId=1152916057816748034, issueId=1153797763918713083, language=EN, specialIssueTitle=, coverIllustrator=, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1172526352130519447, tenantId=1146029695717560320, journalId=1152916057816748034, issueId=1153797763918713083, language=CN, specialIssueTitle=, coverIllustrator=, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=1072, endPage=1082, ext={EN=ArticleExt(id=1153797766959587862, articleId=1153797766422716948, tenantId=1146029695717560320, journalId=1152916057816748034, language=EN, title=Research on Air-Conditioning Refrigeration Performance of Heavy Commercial Vehicles Under Idling and Climbing Conditions, columnId=1153756966938731297, journalTitle=Chinese Journal of Automotive Engineering, columnName=Other Technologies, runingTitle=null, highlight=null, articleAbstract=

The refrigeration performance of the airconditioning system in heavy commercial vehicles is severely constrained by specific driving conditions and the engine compartment layout. The thermalflow field model and AC cooling system model of a heavyduty truck are built using Star CCM+ and AMESim, respectively. The refrigeration performance is analyzed through simulations under hightemperature idling and hightorque climbing conditions. Experimental validation is conducted in an environmental wind tunnel. The effects of compressor speed ratio, condenser inlet air temperature and flow rate, and blower speed on the refrigeration performance are investigated. The simulation results of the air conditioning system are in good agreement with the bench test results, with a maximum error of 4.7%. At 5 000 r/min, the blower can provide an air flow rate of 470 m³/h for the air conditioning duct. Under the idle condition, the average flow rate on the inlet side of the condenser is 2.77 m/s. However, thermal reverse flow in the engine compartment severely affects the COP and the high and low pressures of the air conditioning system. For the optimized and base versions of the Btype vehicle, the system COP decreases by 8.3% and 15.8%, respectively, compared to the Atype vehicle.

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重型商用车空调系统的制冷性能受到具体行车工况以及发动机舱布置的严重制约。基于Star CCM+与AMESim分别建立了某重型商用车的整车热流场模型与空调系统制冷模型,针对重型商用车空调系统在高温怠速与大转矩爬坡工况下的制冷性能进行了仿真分析,并在环境风洞内进行了试验验证,研究了压缩机速比、冷凝器进风温度及流量、鼓风机转速等因素对空调系统性能的影响。结果表明:空调系统仿真结果与试验结果吻合较好,最大误差为4.7%;鼓风机在5000 r/min时可为空调风道提供470m³/h的风量,怠速工况下冷凝器进风侧平均流速为2.77 m/s,而机舱内的热回流会严重影响空调系统的COP与高低压;针对B车型优化版与Base版,系统的COP较A车型分别下降8.3%和15.8%。

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程浩杰(1991-),男,山西长治人,博士,工程师,主要研究方向为整车热管理与能量管理。E-mail:

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程浩杰(1991-),男,山西长治人,博士,工程师,主要研究方向为整车热管理与能量管理。E-mail:

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几何参数 冷凝器 蒸发器
芯体尺寸/mm ${828} \times {310} \times {16}$ ${156} \times {343} \times \left( {{19} \times 2}\right)$
流道分布 ${12} \times 8 \times 6 \times 5$ ${24} \times {2525} \times {24}$
翅片间距/mm 2.8 2.5
翅片厚度/mm 0.08 0.08
翅片长度/mm 20 10
扁管高度/mm 2 2
扁管微通道数量/个 10 9
微通道高度/mm 1.3 1.58
微通道水力直径/mm 1.27 1.3
), ArticleFig(id=1153802009984622878, tenantId=1146029695717560320, journalId=1152916057816748034, articleId=1153797766422716948, language=CN, label=表 1, caption=冷凝器与蒸发器几何参数, figureFileSmall=null, figureFileBig=null, tableContent=
几何参数 冷凝器 蒸发器
芯体尺寸/mm ${828} \times {310} \times {16}$ ${156} \times {343} \times \left( {{19} \times 2}\right)$
流道分布 ${12} \times 8 \times 6 \times 5$ ${24} \times {2525} \times {24}$
翅片间距/mm 2.8 2.5
翅片厚度/mm 0.08 0.08
翅片长度/mm 20 10
扁管高度/mm 2 2
扁管微通道数量/个 10 9
微通道高度/mm 1.3 1.58
微通道水力直径/mm 1.27 1.3
), ArticleFig(id=1153802010039148831, tenantId=1146029695717560320, journalId=1152916057816748034, articleId=1153797766422716948, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
压缩机 冷凝器 蒸发器
速比 1.1~2.1
排量/mL 175
进风温度 CFD模型
进风流量 CFD模型
进风温度 ${}^{10}\mathrm{C}$ 26
相对湿度/% 50
风量 基于鼓风机转速
), ArticleFig(id=1153802010085286176, tenantId=1146029695717560320, journalId=1152916057816748034, articleId=1153797766422716948, language=CN, label=表 2, caption=仿真计算工况, figureFileSmall=null, figureFileBig=null, tableContent=
压缩机 冷凝器 蒸发器
速比 1.1~2.1
排量/mL 175
进风温度 CFD模型
进风流量 CFD模型
进风温度 ${}^{10}\mathrm{C}$ 26
相对湿度/% 50
风量 基于鼓风机转速
), ArticleFig(id=1153802010135617825, tenantId=1146029695717560320, journalId=1152916057816748034, articleId=1153797766422716948, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
1 挡 2 挡 3 挡 4 挡 5 挡 6 挡 7 挡
转速/( $\mathrm{r}/\mathrm{{min}}$ ) 1700 2500 3000 3700 4 400 4 700 5000
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1 挡 2 挡 3 挡 4 挡 5 挡 6 挡 7 挡
转速/( $\mathrm{r}/\mathrm{{min}}$ ) 1700 2500 3000 3700 4 400 4 700 5000
), ArticleFig(id=1153802010232086819, tenantId=1146029695717560320, journalId=1152916057816748034, articleId=1153797766422716948, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
怠速工况 低速爬坡(转矩点)
车速/(km/h) 0.1 20
环境温度 ${}^{1}{}^{ \circ }\mathrm{C}$ 40 40
发动机转速/( $\mathrm{r}/\mathrm{{min}}$ ) 700 1600
风扇速比 1.25
冷凝器换热量/kW 根据空调系统仿真提供
中冷器进气量/(kg/h) 288 1100
中冷器进气温度 ${}^{1}{}^{ \circ }\mathrm{C}$ 120 190
散热器水流量/(L/min) 88 196
散热器进水温度 ${}^{1}{}^{ \circ }\mathrm{C}$ 98 98
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怠速工况 低速爬坡(转矩点)
车速/(km/h) 0.1 20
环境温度 ${}^{1}{}^{ \circ }\mathrm{C}$ 40 40
发动机转速/( $\mathrm{r}/\mathrm{{min}}$ ) 700 1600
风扇速比 1.25
冷凝器换热量/kW 根据空调系统仿真提供
中冷器进气量/(kg/h) 288 1100
中冷器进气温度 ${}^{1}{}^{ \circ }\mathrm{C}$ 120 190
散热器水流量/(L/min) 88 196
散热器进水温度 ${}^{1}{}^{ \circ }\mathrm{C}$ 98 98
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蒸发器换 热量/W 压缩机功 耗/W COP 吸气压力/ MPa 排气压力/
试验值 4 445 1 307 3.40 0.252 1.165
仿真值 4319 1 296 3.33 0.262 1.220
误差/% 2.8 0.8 2.0 4.7 4.7
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蒸发器换 热量/W 压缩机功 耗/W COP 吸气压力/ MPa 排气压力/
试验值 4 445 1 307 3.40 0.252 1.165
仿真值 4319 1 296 3.33 0.262 1.220
误差/% 2.8 0.8 2.0 4.7 4.7
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散热器 3.1 2.8 2.9 3.2
中冷器 2.8 3.3 3.7 2.4
冷凝器 2.4 2.5 2.2 2.0
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散热器 3.1 2.8 2.9 3.2
中冷器 2.8 3.3 3.7 2.4
冷凝器 2.4 2.5 2.2 2.0
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位置
41.7 41.9 42.0
41.4 40.8 41.6
41.6 42.1 41.5
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位置
41.7 41.9 42.0
41.4 40.8 41.6
41.6 42.1 41.5
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类别 蒸发器温度/℃ 压缩机压力/MPa
进风 出风 高压 低压
试验 26 9.2 1.48 0.21
1D/3D仿真 8.8 1.52 0.18
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类别 蒸发器温度/℃ 压缩机压力/MPa
进风 出风 高压 低压
试验 26 9.2 1.48 0.21
1D/3D仿真 8.8 1.52 0.18
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1 挡 2 挡 3 挡 4 挡 5 挡 6挡 7 挡
转速/(r/min) 1700 2500 3000 3700 4 400 4 700 5000
风量 $/\left( {{\mathrm{m}}^{3}/\mathrm{h}}\right)$ 145 220 270 340 410 435 470
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1 挡 2 挡 3 挡 4 挡 5 挡 6挡 7 挡
转速/(r/min) 1700 2500 3000 3700 4 400 4 700 5000
风量 $/\left( {{\mathrm{m}}^{3}/\mathrm{h}}\right)$ 145 220 270 340 410 435 470
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重型商用车怠速与爬坡工况对空调制冷性能的影响
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程浩杰 1 , 徐亚坤 1 , 任黎亚 1 , 董丽萍 1 , 王晓龙 1 , 张磊 1 , 张艺伦 2
汽车工程学报 | 其他 2024,14(6): 1072-1082
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汽车工程学报 | 其他 2024, 14(6): 1072-1082
重型商用车怠速与爬坡工况对空调制冷性能的影响
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程浩杰1 , 徐亚坤1, 任黎亚1, 董丽萍1, 王晓龙1, 张磊1, 张艺伦2
作者信息
  • 1 中国重汽集团汽车研究总院 济南 250100
  • 2 中汽研(天津)汽车工程研究院有限公司 天津 300300
  • 程浩杰(1991-),男,山西长治人,博士,工程师,主要研究方向为整车热管理与能量管理。E-mail:

Research on Air-Conditioning Refrigeration Performance of Heavy Commercial Vehicles Under Idling and Climbing Conditions
Haojie CHENG1 , Yakun XU1, Liya REN1, Liping DONG1, Xiaolong WANG1, Lei ZHANG1, Yilun ZHANG2
Affiliations
  • 1 China National Heavy Duty Truck Group Automotive Research Institute Jinan 250100 China
  • 2 CATARC (Tianjin) Automotive Engineering Research Institute Co., Ltd. Tianjin 300300 China
doi: 10.3969/j.issn.2095-1469.2024.06.14
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重型商用车空调系统的制冷性能受到具体行车工况以及发动机舱布置的严重制约。基于Star CCM+与AMESim分别建立了某重型商用车的整车热流场模型与空调系统制冷模型,针对重型商用车空调系统在高温怠速与大转矩爬坡工况下的制冷性能进行了仿真分析,并在环境风洞内进行了试验验证,研究了压缩机速比、冷凝器进风温度及流量、鼓风机转速等因素对空调系统性能的影响。结果表明:空调系统仿真结果与试验结果吻合较好,最大误差为4.7%;鼓风机在5000 r/min时可为空调风道提供470m³/h的风量,怠速工况下冷凝器进风侧平均流速为2.77 m/s,而机舱内的热回流会严重影响空调系统的COP与高低压;针对B车型优化版与Base版,系统的COP较A车型分别下降8.3%和15.8%。

空调制冷系统  /  发动机舱  /  冷却模块  /  热回流  /  性能系数

The refrigeration performance of the airconditioning system in heavy commercial vehicles is severely constrained by specific driving conditions and the engine compartment layout. The thermalflow field model and AC cooling system model of a heavyduty truck are built using Star CCM+ and AMESim, respectively. The refrigeration performance is analyzed through simulations under hightemperature idling and hightorque climbing conditions. Experimental validation is conducted in an environmental wind tunnel. The effects of compressor speed ratio, condenser inlet air temperature and flow rate, and blower speed on the refrigeration performance are investigated. The simulation results of the air conditioning system are in good agreement with the bench test results, with a maximum error of 4.7%. At 5 000 r/min, the blower can provide an air flow rate of 470 m³/h for the air conditioning duct. Under the idle condition, the average flow rate on the inlet side of the condenser is 2.77 m/s. However, thermal reverse flow in the engine compartment severely affects the COP and the high and low pressures of the air conditioning system. For the optimized and base versions of the Btype vehicle, the system COP decreases by 8.3% and 15.8%, respectively, compared to the Atype vehicle.

air conditioning refrigeration system  /  engine compartment  /  cooling module  /  thermal reversed flow  /  coefficient of performance
程浩杰, 徐亚坤, 任黎亚, 董丽萍, 王晓龙, 张磊, 张艺伦. 重型商用车怠速与爬坡工况对空调制冷性能的影响. 汽车工程学报, 2024 , 14 (6) : 1072 -1082 . DOI: 10.3969/j.issn.2095-1469.2024.06.14
Haojie CHENG, Yakun XU, Liya REN, Liping DONG, Xiaolong WANG, Lei ZHANG, Yilun ZHANG. Research on Air-Conditioning Refrigeration Performance of Heavy Commercial Vehicles Under Idling and Climbing Conditions[J]. Chinese Journal of Automotive Engineering, 2024 , 14 (6) : 1072 -1082 . DOI: 10.3969/j.issn.2095-1469.2024.06.14
制冷空调系统对热舒适性和行车安全有较大的影响 [ 1 ] ,其主要功能是用来调节驾驶室内的温度、 湿度、风速以及空气的新鲜度等。与乘用车相比, 重型商用车行车时间长、热负荷大、车速低、行车工况恶劣, 这对空调系统的设计与匹配提出了更高的要求 [ 2 ] 。目前,重型商用车仍然以传统能源为主,空调压缩机由发动机驱动,在发动机和压缩机之间的动力传动装置控制着压缩机和发动机之间的速比。
张英朝等 [ 3 ] 建立了 $1\mathrm{D}/3\mathrm{D}$ 强耦合的汽车热管理仿真模型, 分析了不同工况下汽车热管理系统的性能,所研究的车型冷凝器进风侧温度为 ${52.5}^{ \circ }\mathrm{C}$ , 较环境温度 ${35}^{ \circ }\mathrm{C}$ 上升 ${17.5}^{ \circ }\mathrm{C}$ ,并未采用有效的措施改善热回流。雷舒蓉等 [ 4 ] 基于Kuli对商用车空调系统进行仿真分析及优化, 并提出了多种优化方案,但是并未对各方案进行有效的试验验证。刘登封等 [ 5 ] 通过试验对比了 $\mathrm{H}$ 型膨胀阀与电子膨胀阀在不同工况、不同压缩机转速下汽车空调系统的性能, 研究发现电子膨胀阀的调节能力要明显优于热力膨胀阀。陈存福等 [ 6 ] 对商用车发动机舱热流场进行了仿真计算, 并结合道路试验研究了格栅开口率、发动机舱挡板、风扇与散热器间距等因素对机舱热流场的影响,而空调的性能并未考虑。
目前,针对商用车空调系统制冷性能的仿真并未考虑真实的行车工况, 机舱热回流导致的冷凝器进气高温产生的影响也很少被提及。因此, 本文基于 AMESim 与 Star CCM+分别建立了准确的空调系统模型及整车热流场模型, 针对高温怠速工况与大转矩爬坡工况下的空调制冷性能进行全面的仿真分析与试验验证。
汽车空调系统由压缩机、冷凝器、储液干燥器、膨胀阀、蒸发器及相应的阀门管道组成, 常用的制冷剂为 $\mathrm{R}{134}\mathrm{a}$ ; 当发动机带动压缩机运转时, 压缩机将低温低压的气态制冷剂压缩成高温高压的气态制冷剂, 过热的气态制冷剂进入冷凝器后, 温度降低,制冷剂由气态变为液态;液态制冷剂由管道进入到热力膨胀阀后, 压力和温度急剧下降, 并以雾状液滴进入至蒸发器, 随后低温液态制冷剂与风道中的高温空气进行换热变为气态制冷剂, 最后进入至压缩机进行再次循环。
通常, 传统商用车的冷凝器与中冷器、散热器串联形成冷却模块, 位于发动机的正前端。由发动机驱动的冷却风扇为冷却模块提供冷却气流;而蒸发器位于空调箱体内、鼓风机下游, 并利用鼓风机的动力为乘员舱输送循环冷风。
传统商用车一般采用斜盘式压缩机,影响压缩机性能参数主要的因素是等熵效率、容积效率和机械效率;压缩机效率是压缩比和转速的函数, 具体的效率MAP图可通过压缩机单体性能试验获取。
$\mathrm{{H型热力膨胀阀结构紧凑、性能可靠,膨胀阀}}$ 的零点标定及验证是保证膨胀阀性能的关键。在 AMESim 中,表征 $\mathrm{H}$ 型热力膨胀阀的性能参数为四象限图, 第 1 象限为蒸发器出口温度-蒸发器出口压力, 第 2 象限为膨胀阀开度 - 蒸发器出口压力, 第 3 象限为膨胀阀开度一制冷剂流量, 第 4 象限为蒸发器出口温度一制冷剂流量, 具体膨胀阀性能试验可参考标准 QC/T 663-2019 [ 7 ]
车载空调系统所用的冷凝器为单排的微通道平行流换热器, 主要由扁管和翅片组成。制冷剂在扁管内进行流动, 可依次分为过热段、两相段以及过冷段。其中, 过热段与过冷段为单相流动, 可采用 Gnielinski 换热关联式; 对于两相段的制冷剂冷凝, 可采用Shah [ 8 ] 换热关联式; 而空气侧的流动换热可采用Dittus-Boelter换热关联式。
图 1 所示, 目前车载空调系统所用的蒸发器为双排微通道平行流换热器, 而非层叠式换热器 [ 3 ] 。与层叠式蒸发器相比,微通道蒸发器具有体积小、重量轻、换热性能好等优势 [ 9 ]
雾状的两相制冷剂在扁管内进行蒸发换热, 其流程可分为两相段和过热段。其中, 两相段为制冷剂的蒸发,可采用VDI Heat Atlas [ 10 ] 关联式; 而过热段为单相流换热, 则采用与冷凝器相同的换热关联式。
冷凝器与蒸发器的详细几何参数见 表 1 , 在 AMESim中建立了空调制冷系统的仿真模型, 如 图 2 所示。
本文主要研究了压缩机速比、冷凝器进风温度及流量、鼓风机转速等因素对空调系统性能的影响。仿真计算的具体工况见 表 2 , 蒸发器的进风温度及相对湿度被认为是恒定的,分别为 ${30}^{ \circ }\mathrm{C}$ 、 50%。
将空调系统集成到整车中, 其性能会受到整车行驶工况的影响, 主要表现在冷凝器迎风侧的风速、空气温度以及蒸发器的进风量。如 图 3 所示, 建立了某型重卡的整车结构模型, 包括驾驶室、动力总成、冷却模块、进风格栅、车桥、轮胎等零部件与总成。
在传统的重型商用车中, 冷凝器一般位于进气格栅后端、发动机舱最前端,如 图 4 所示,从左至右依次为冷凝器、中冷器、散热器、风扇和发动机。怠速工况下依靠风扇的旋转提供风量;而行驶工况下依靠迎面风速与风扇的双重作用。实际工况下, 冷凝器受到发动机舱的影响, 其进风温度和进风风速并不均匀,因此,基于 Star CCM+对整车热流场进行建模,建立 $8\mathrm{\;L} \times 5\mathrm{\;W} \times 3\mathrm{H}$ 环境风洞模型, 对关键零部件和区域进行局部加密处理, 共生成约 8 千万个体网格, 机舱热流场网格模型如 图 5 所示。
商用车的空调风道系统主要由空调箱体与气流分配管道构成。空调箱体中包括进气格栅、空气滤芯、鼓风机、蒸发器、暖风芯体等。在空调制冷模式下,通常采用吹面风道将冷却后的气流导入至乘员舱中。
本文建立了吹面模式下的空调风道系统三维流场模型, 包括离心式鼓风机 MRF 旋转域, 空气滤芯、蒸发器、暖风芯体多孔介质域,如 图 6 a 所示。 其中, 离心式鼓风机共 7 个挡位, 每个挡位对应不同的鼓风机转速, 见 表 3 , 鼓风机最大挡位时的转速约为 ${5000}\mathrm{r}/\mathrm{{min}}$ ;空气滤芯、蒸发器、暖风芯体等多孔介质域采用压力-流量曲线拟合惯性阻力系数与粘性阻力系数来表征流动阻力。此外, 图 6 b 给出了吹面风道的仿真模型。
本文主要对怠速工况和低速爬坡工况进行了仿真模拟,环境温度为 ${40}^{ \circ }\mathrm{C}$ ,风扇速比为1.25,冷凝器被认为是均匀的热源, 采用单流体换热器模型建模, 其换热量通过空调系统仿真模型得到; 中冷器与散热器采用双流体换热器模型建模, 基于发动机台架试验获取具体的温度与流量参数; 表 4 总结了发动机舱热流场仿真工况, 由于发动机排气侧的热源对发动机舱热流场的影响较小, 无需具体指定排气侧的热源表面温度。怠速工况下机舱内的流动是由风扇旋转做功引起的, 为强迫对流, 且流速较高,因此,可忽略自然对流的影响。
图 7 给出了车辆在怠速工况下冷凝器芯体进风侧的温度分布与速度分布。由图可知, 芯体侧的温度分布并不均匀, 左下方与右侧存在局部高温区域, 最高温度约为 ${50}^{ \circ }\mathrm{C}$ ,较环境温度升高了约 ${10}^{ \circ }\mathrm{C}$ ; 冷凝器迎风侧质量流量平均温度约为 ${42.6}^{ \circ }\mathrm{C}$ ,较环境温度升高了 ${2.6}^{ \circ }\mathrm{C}$ 。由 图 7 b 可知,冷凝器芯体侧的速度相对均匀,分布区间为 ${1.5} \sim {3.5}\mathrm{\;m}/\mathrm{s}$ ,然而由于怠速工况下冷却风扇的转速较低,导致冷凝器的进风量相对较小。
图 8 给出了怠速工况下整车 $Z$ 方向截面温度分布。由图可知,发动机舱内的气流通过冷凝器、中冷器和散热器后温度逐渐升高, 怠速工况下散热器的散热量约为 ${93}\mathrm{\;{kW}}$ ,而散热器出风面的平均温度约为 ${83}^{ \circ }\mathrm{C}$ 。同时,冷却气流受到发动机、车架和悬架 [ 11 ] 等的影响,一部分高温气流会由冷却模块左右两侧回流至前端, 导致前舱局部区域温度较高,约为 ${50}^{ \circ }\mathrm{C}$
图 9 给出了车辆在大转矩爬坡工况下冷凝器芯体进风侧的温度分布与速度分布。由图可知, 芯体侧的温度分布同样不均匀, 其中部下方与右侧存在局部高温区域,最高温度约为 ${48}^{ \circ }\mathrm{C}$ ; 在较高的风扇转速下,冷凝器迎风侧质量流量平均温度约为 ${41.5}^{ \circ }\mathrm{C}$ ,较环境温度升高了 ${1.5}^{ \circ }\mathrm{C}$ ,其进风平均温度要低于怠速工况下的进风平均温度; 冷凝器芯体侧的速度相比怠速工况下有明显的提升,速度分布区间约为 $5 \sim {10}\mathrm{m}/\mathrm{s}$ ;且高转速下的冷凝器进风流量约为 ${1.83}\mathrm{\;{kg}}/\mathrm{s}$
图 10 给出了大转矩爬坡工况下整车 $Z$ 方向截面温度分布。由图可知,发动机舱内的气流通过冷却模块后的温度明显低于怠速工况下的温度, 这是因为在迎风风速和高风扇转速的双重影响下,提高了冷却模块的气流流量, 从而降低了出风的平均温度; 同时, 冷凝器前端的回流区域和回流温度明显小于怠速工况。
图 11 所示, 在空调焓差实验室对实车管路空调系统的制冷性能进行研究, 并基于试验结果对 $1\mathrm{D}$ 仿真模型进行标定与验证。试验所采用的压缩机排量为 ${175}\mathrm{\;{mL}}$ ,研究了压缩机转速为 ${1000}\mathrm{r}/\mathrm{{min}}$ , 冷凝器进风干球温度为 ${35}^{ \circ }\mathrm{C}$ ,进风量为 2 400 ${\mathrm{m}}^{3}/\mathrm{h}$ ,蒸发器进风干球温度为 ${30}^{ \circ }\mathrm{C}$ ,相对湿度为 ${50}\%$ ,蒸发器进风量为 ${530}{\mathrm{\;m}}^{3}/\mathrm{h}$ 时空调系统的性能;同时,也给出了相同工况下空调系统仿真模型的计算结果。由 表 5 可知, 在此工况下蒸发器换热量的试验值与仿真值分别为 ${4445}\mathrm{\;W}$${4319}\mathrm{\;W}$ , 误差为 2.8%;而压缩机功耗的试验值与仿真值约为 ${1307}\mathrm{\;W}$${1296}\mathrm{\;W}$ ,误差为 ${0.8}\%$ ; 同时,由表中的其他参数可知, 仿真与试验的最大误差约为 4.7%,仿真结果与试验结果吻合较好。
本文以某重型商用车为研究对象, 将其置于整车环境风洞转毂试验台, 针对怠速工况及行驶工况下的空调性能进行整车测试, 如 图 12 所示。在进行整车转毂试验之前, 需要对关键的零部件进行布点。如 图 13 a 所示, 取出空调风道内的蒸发器, 在其进风侧与出风侧按照九宫格方式布置 18 个温度测点, 计算其进风侧与出风侧的平均温度; 以同样的方式对发动机舱前端的冷凝器布置 18 个温度测点,如 图 13 b 所示; 同时, 在冷却模块迎风面安装 12 个叶轮流量计,从左往右依次标记为① $\sim$ ④,分别统计冷凝器、中冷器、散热器进风侧的速度与流量,如 图 13 c 所示; 此外,在压缩机的进出口分别布置 2 个压力传感器以测量空调系统的高低压。
整车试验布点完成后, 设定风洞内环境温度为 ${40}^{ \circ }\mathrm{C}$ ,相对湿度 ${50}\%$ ,光照强度 ${1000}\mathrm{\;W}/{\mathrm{m}}^{2}$ ,且风速跟随车速变化, 完成怠速工况及低速工况下空调系统的性能验证。
试验开始时将空调面板模式调整为: 鼓风机挡位最大、温度最低、吹面模式、内循环。整车怠速工况下冷凝器进风侧流速分布与温度分布试验结果见表 6~7。冷凝器流速与温度的矩阵分布在垂直方向上分别与试验中采集的 12 个速度测点与 9 个温度测点相对应,其中,最高流速为 ${3.7}\mathrm{\;m}/\mathrm{s}$ ,最低流速为 ${2.0}\mathrm{\;m}/\mathrm{s}$ ,平均流速为 ${2.77}\mathrm{\;m}/\mathrm{s}$ ; 局部最高温度为 ${42.0}^{ \circ }\mathrm{C}$ ,最低温度 ${40.8}^{ \circ }\mathrm{C}$ ,平均温度为 ${41.6}^{ \circ }\mathrm{C}$ 。 由 图 10 可知, 怠速工况下的冷凝器进风侧平均流速仿真结果约为 ${2.49}\mathrm{\;m}/\mathrm{s}$ ,误差约为 ${10}\%$ ;进风侧的平均温度为 ${42.6}^{ \circ }\mathrm{C}$ ,误差为 ${2.3}\%$ ,仿真结果与试验结果吻合较好。
在内循环模式下, 蒸发器的进风温度相对均匀,平均温度约为 ${26}^{ \circ }\mathrm{C}$ ,蒸发器出风平均温度约为 ${9.2}^{ \circ }\mathrm{C}$ ,见 表 8 ,蒸发器出风温度与高压试验值与 1D/3D 耦合仿真值均吻合较好。系统的高低压采用的是一段时间内的平均值。
首先对不同鼓风机转速产生的风量进行仿真计算, 见 表 9 , 当鼓风机处于最高挡位时, 即转速为 ${5000}\mathrm{r}/\mathrm{{min}}$ ,能产生的最大吹面风量约为 ${470}{\mathrm{\;m}}^{3}/\mathrm{h}$ ; 且蒸发器的进风温度和进气风速相对均匀。
怠速工况下,当压缩机速比为 1.5 时,鼓风机转速对系统高低压、蒸发器换热量和出风温度的影响, 如 图 14 所示。由图可知, 系统高低压、蒸发器制冷量及出风温度均随着鼓风机转速的增加而增加。虽然低转速下的蒸发器出风温度较低,但是较低的制冷量和出风风速也无法满足乘员舱的制冷需求和乘客的热舒适性要求 [ 12 ] ,因此,当鼓风机出现故障或无法提供较大的风量时, 会严重影响制冷性能和系统的运行状态。
1D/3D 耦合仿真流程如 图 15 所示。其中, 空调系统的冷凝器作为 $1\mathrm{D}/3\mathrm{D}$ 仿真分析的桥梁,一维仿真将冷凝器的换热量传递给三维仿真, 三维流场将仿真得到的冷凝器进风温度与流量数据传递给一维仿真, 从而完成整体的计算。
怠速工况与大转矩爬坡工况下压缩机速比对系统高低压、蒸发器换热量和出风温度等因素的影响,如 图 16 所示。由 图 16 a 可知,空调系统的高压随着压缩机速比的增加而增加, 而低压随着速比的增加而下降。高压的增加、低压的下降意味着制冷剂冷凝温度的上升和蒸发温度的下降, 从而加大了系统的制冷量。与大转矩工况相比, 由于怠速工况下压缩机转速较低,其高压略低。
图 16 b 可知,空调系统的制冷量随压缩机速比的增加而增加, 而 COP 随着速比的增加而减小; 当速比为 1.1 时, 大转矩工况下系统的制冷量约为 ${5.5}\mathrm{\;{kW}}$ ,远高于怠速工况下产生的制冷量 ${4.1}\mathrm{\;{kW}}$ 。 然而,怠速工况下系统的 COP 却高于大转矩工况。 由 图 16 c 可知, 蒸发器出风温度与驾驶室平均温度均随着压缩机速比的增加而减小。怠速工况下,当速比为 2.1 时,蒸发器出风温度约为 ${8.2}^{ \circ }\mathrm{C}$ ,驾驶室稳定后的平均温度约为 ${23.6}^{ \circ }\mathrm{C}$ ; 而当速比为 1.7 时, 驾驶室稳定后的平均温度约为 ${24.8}^{ \circ }\mathrm{C}$ ;当乘员舱的平均温度低于 ${25}^{ \circ }\mathrm{C}$ 时,则认为已满足乘员舱的降温需求。
受到进气格栅、发动机舱内布置、护风罩以及冷却模块倾斜角度等因素的影响,针对怠速工况下不同的车型其冷凝器进风温度均有较大的差异。 图 17 给出了另外一款重型商用车 (称为 $\mathrm{B}$ 车) 怠速工况下冷凝器的进风温度, 可以看出 Base 版冷凝器迎风面存在大范围的高温区域, 其平均温度约 ${51}^{ \circ }\mathrm{C}$ ; 通过对原车的风扇罩与风扇的嵌入深度进行研究, 得到了最佳的嵌入度 ( 图 18 ), 从而改善热回流,使冷凝器迎风面的温度降低至 ${44.5}^{ \circ }\mathrm{C}$ ,如 图 17b 所示。
图 19 给出了怠速工况下 B 车 Base 版、优化版较 $\mathrm{A}$ 车的空调系统性能对比。由图可知,在不同的压缩机速比下随着热回流温度的升高, 空调的制冷 COP 不断下降。当压缩机速比为 1.7 ,针对 B 车优化版与 Base 版, 系统的 COP 较 A 车分别下降 8.3% 和 15.8%。而当速比为 2.1 时, B 车优化版与 Base 版分别会使系统的 COP 降低 ${8.5}\%$${14.7}\%$ 。此外,冷凝器进气温度的升高也会显著提升系统的冷凝压力,从而增加系统的冷凝温度, 确保冷凝器的换热;Base 版车型的空调系统高压约为 ${1.82}\mathrm{{MPa}}$ ,因此, 降低发动机舱内的热回流不仅可以提升空调系统的性能,而且还能降低空调系统的能耗。
本文基于 Star CCM+与 AMESim 分别建立了某重型卡车的整车热流场模型与空调系统制冷模型, 并根据环境风洞试验结果验证了仿真模型的准确性, 同时研究了重型商用车空调系统在高温怠速与大转矩爬坡工况下的制冷性能, 得到的主要结论如下。
(1)整车怠速工况下冷凝器进风侧平均流速为 ${2.77}\mathrm{\;m}/\mathrm{s}$ ,平均温度为 ${41.6}^{ \circ }\mathrm{C}$
(2)当鼓风机最高转速约 ${5000}\mathrm{r}/\mathrm{{min}}$ 时,空调风道系统能产生的最大吹面风量约为 ${470}{\mathrm{\;m}}^{3}/\mathrm{h}$ ,且随着转速的降低,吹面风量显著下降。
( 3 )怠速工况下,空调系统压缩机的压比及蒸发器的换热量随着压缩机速比的增加而增加, 而系统的 COP 随着速比的增加而下降, 同时, 蒸发器出风温度与驾驶室平均温度均随着压缩机速比的增加而减小。为了保证空调系统的能耗和驾驶室的降温需求 $\left( { < {25}^{ \circ }\mathrm{C}}\right)$ ,压缩机最佳的速比约为 1.7,而大转矩工况下压缩机的最佳速比约为 1.1 。
(4)怠速工况下,当压缩机速比为 1.7 时,针对 $\mathrm{B}$ 车优化版与 Base 版,系统的 $\mathrm{{COP}}$$\mathrm{A}$ 车分别下降 8.3% 和 15.8%。
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2024年第14卷第6期
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doi: 10.3969/j.issn.2095-1469.2024.06.14
  • 接收时间:2023-08-11
  • 首发时间:2025-07-20
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  • 收稿日期:2023-08-11
  • 修回日期:2023-10-20
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    1 中国重汽集团汽车研究总院 济南 250100
    2 中汽研(天津)汽车工程研究院有限公司 天津 300300
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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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