Article(id=1220368076592301038, tenantId=1146029695717560320, journalId=1146119989267898375, issueId=1220368072699986922, articleNumber=null, orderNo=null, doi=10.7654/j.issn.2097-1974.20250604, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1751644800000, receivedDateStr=2025-07-05, revisedDate=1763827200000, revisedDateStr=2025-11-23, acceptedDate=null, acceptedDateStr=null, onlineDate=1768888022801, onlineDateStr=2026-01-20, pubDate=1766592000000, pubDateStr=2025-12-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1768888022801, onlineIssueDateStr=2026-01-20, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1768888022801, creator=13701087609, updateTime=1768888022801, updator=13701087609, issue=Issue{id=1220368072699986922, tenantId=1146029695717560320, journalId=1146119989267898375, year='2025', volume='48', issue='6', pageStart='1', pageEnd='106', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1768888021873, creator=13701087609, updateTime=1768888582821, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1220370425566118679, tenantId=1146029695717560320, journalId=1146119989267898375, issueId=1220368072699986922, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1220370425570312984, tenantId=1146029695717560320, journalId=1146119989267898375, issueId=1220368072699986922, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=26, endPage=32, ext={EN=ArticleExt(id=1220368076856542194, articleId=1220368076592301038, tenantId=1146029695717560320, journalId=1146119989267898375, language=EN, title=Regenerative Cooling System for Scramjet Engine Based on Supercritical CO2 Cycle, columnId=1154057566893105509, journalTitle=Missiles and Space Vehicles, columnName=Propulsion, runingTitle=null, highlight=null, articleAbstract=

The scramjet engine usually employs a fuel regeneration cooling system to cool the walls. As a highly efficient thermal engine, the supercritical carbon dioxide (S-CO2) cycle system can recover and utilize heat energy to generate electricity to power equipment while reducing the amount of fuel needed for cooling and effectively enhancing the engine's overall performance. An overall parametric analysis of the cooling system for the scramjet engine is conducted based on the supercritical CO2 cycle power generation system, obtaining a system-generated power output of 65kW and a cycle efficiency of 11.75%. Additionally, the impact of various parameters is evaluated such as compressor pressure ratio, turbine inlet temperature, engine heat input, compressor inlet temperature, compressor isentropic efficiency, and turbine isentropic efficiency on system power generation and efficiency. Using a multi-objective genetic algorithm, the maximum power output and efficiency of the system are assessed, and preliminary designs for key components including the precooler and compressor are conducted.

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超燃冲压发动机通常采用燃油再生冷却的方式对壁面进行降温,超临界CO2循环系统作为一种高效能热机,可以将这部分热量加以回收利用,产生电能供电器设备使用,同时降低了冷却所需燃料用量,有效提升了发动机整体性能。对基于超临界CO2循环发电系统的超燃冲压发动机冷却系统进行了总体参数分析,得到该系统可产生的电能和循环效率,同时,评估了压气机压比、涡轮前温度、发动机热量输入、压气机入口温度、压气机等熵效率、涡轮等熵效率对系统发电量及效率的影响,应用多目标遗传算法评估了系统最大发电量及发电效率,对关键部件预冷器及压气机开展了设计。

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朱鹏举(1994—),男,工程师,主要研究方向为飞行器总体设计、超临界流动换热、主动冷却系统设计等。

孙羽(1994—),女,博士研究生,工程师,主要研究方向为吸气式动力飞行器总体设计、固体火箭发动机总体设计、气动声学等。

巩帆(1988—),女,博士研究生,高级工程师,主要研究方向为超燃冲压发动机总体设计、超声速流体燃烧、吸气式动力飞行器总体设计等。

姜金朋(1988—),女,博士研究生,高级工程师,主要研究方向为超燃冲压发动机总体设计、固体火箭发动机总体设计、吸气式动力飞行器总体设计等。

李承恩(1992—),男,博士研究生,高级工程师,主要研究方向为增压输送总体设计、固体火箭发动机总体设计、飞行器总体设计等。

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朱鹏举(1994—),男,工程师,主要研究方向为飞行器总体设计、超临界流动换热、主动冷却系统设计等。

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朱鹏举(1994—),男,工程师,主要研究方向为飞行器总体设计、超临界流动换热、主动冷却系统设计等。

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孙羽(1994—),女,博士研究生,工程师,主要研究方向为吸气式动力飞行器总体设计、固体火箭发动机总体设计、气动声学等。

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孙羽(1994—),女,博士研究生,工程师,主要研究方向为吸气式动力飞行器总体设计、固体火箭发动机总体设计、气动声学等。

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巩帆(1988—),女,博士研究生,高级工程师,主要研究方向为超燃冲压发动机总体设计、超声速流体燃烧、吸气式动力飞行器总体设计等。

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巩帆(1988—),女,博士研究生,高级工程师,主要研究方向为超燃冲压发动机总体设计、超声速流体燃烧、吸气式动力飞行器总体设计等。

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姜金朋(1988—),女,博士研究生,高级工程师,主要研究方向为超燃冲压发动机总体设计、固体火箭发动机总体设计、吸气式动力飞行器总体设计等。

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姜金朋(1988—),女,博士研究生,高级工程师,主要研究方向为超燃冲压发动机总体设计、固体火箭发动机总体设计、吸气式动力飞行器总体设计等。

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李承恩(1992—),男,博士研究生,高级工程师,主要研究方向为增压输送总体设计、固体火箭发动机总体设计、飞行器总体设计等。

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李承恩(1992—),男,博士研究生,高级工程师,主要研究方向为增压输送总体设计、固体火箭发动机总体设计、飞行器总体设计等。

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The thermodynamic parameters of each state point

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名称符号单位数值
压气机入口温度T1K310
压气机入口压力P1kPa7 500
压气机出口温度T2K381
压气机出口压力P2kPa18 750
涡轮入口温度T3K800
涡轮入口压力P3kPa18 563
涡轮出口温度T4K698
涡轮出口压力P4kPa7 576
压气机功率WckW44.1
涡轮功率WtkW109.9
发电功率WkW65.1
循环效率η%11.75
CO2流量Mkg/s0.996
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各状态点热力学参数

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名称符号单位数值
压气机入口温度T1K310
压气机入口压力P1kPa7 500
压气机出口温度T2K381
压气机出口压力P2kPa18 750
涡轮入口温度T3K800
涡轮入口压力P3kPa18 563
涡轮出口温度T4K698
涡轮出口压力P4kPa7 576
压气机功率WckW44.1
涡轮功率WtkW109.9
发电功率WkW65.1
循环效率η%11.75
CO2流量Mkg/s0.996
), ArticleFig(id=1220368090441892211, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1220368076592301038, language=EN, label=Tab.2, caption=

Design result of the precooler

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名称单位数值
宽度m1.2
高度m0.01
长度m0.8
冷却通道直径mm1
通道间距mm3
单层板高度mm2
超临界CO2进出口温度K698/310
煤油进出口温度K290/625
煤油流量kg/s0.5
超临界CO2侧压力损失kPa34.5
预冷器质量kg27.3
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预冷器设计结果

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名称单位数值
宽度m1.2
高度m0.01
长度m0.8
冷却通道直径mm1
通道间距mm3
单层板高度mm2
超临界CO2进出口温度K698/310
煤油进出口温度K290/625
煤油流量kg/s0.5
超临界CO2侧压力损失kPa34.5
预冷器质量kg27.3
), ArticleFig(id=1220368090626441596, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1220368076592301038, language=EN, label=Tab.3, caption=

One-dimensional design results of the centrifugal compressor

, figureFileSmall=null, figureFileBig=null, tableContent=
名称单位数值
压气机入口总温K310
压气机入口总压kPa7 500
设计流量kg/s1
设计压比2.5
设计转速r/min60 000
进口轮毂直径mm8.4
进口轮缘直径mm12.6
出口直径mm28.8
出口叶片高度mm0.9
轴向长度mm10.5
叶顶间隙mm0.3
叶片厚度mm0.6
叶片数5/10
), ArticleFig(id=1220368090773242240, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1220368076592301038, language=CN, label=表3, caption=

离心式压气机一维设计结果

, figureFileSmall=null, figureFileBig=null, tableContent=
名称单位数值
压气机入口总温K310
压气机入口总压kPa7 500
设计流量kg/s1
设计压比2.5
设计转速r/min60 000
进口轮毂直径mm8.4
进口轮缘直径mm12.6
出口直径mm28.8
出口叶片高度mm0.9
轴向长度mm10.5
叶顶间隙mm0.3
叶片厚度mm0.6
叶片数5/10
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基于超临界CO2循环的超燃冲压发动机再生冷却系统
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朱鹏举 , 孙羽 , 巩帆 , 姜金朋 , 李承恩
导弹与航天运载技术(中英文) | 动力系统 2025,48(6): 26-32
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导弹与航天运载技术(中英文) | 动力系统 2025, 48(6): 26-32
基于超临界CO2循环的超燃冲压发动机再生冷却系统
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朱鹏举, 孙羽, 巩帆, 姜金朋, 李承恩
作者信息
  • 空间物理重点实验室,北京,100076
  • 朱鹏举(1994—),男,工程师,主要研究方向为飞行器总体设计、超临界流动换热、主动冷却系统设计等。

    孙羽(1994—),女,博士研究生,工程师,主要研究方向为吸气式动力飞行器总体设计、固体火箭发动机总体设计、气动声学等。

    巩帆(1988—),女,博士研究生,高级工程师,主要研究方向为超燃冲压发动机总体设计、超声速流体燃烧、吸气式动力飞行器总体设计等。

    姜金朋(1988—),女,博士研究生,高级工程师,主要研究方向为超燃冲压发动机总体设计、固体火箭发动机总体设计、吸气式动力飞行器总体设计等。

    李承恩(1992—),男,博士研究生,高级工程师,主要研究方向为增压输送总体设计、固体火箭发动机总体设计、飞行器总体设计等。

Regenerative Cooling System for Scramjet Engine Based on Supercritical CO2 Cycle
Pengju ZHU, Yu SUN, Fan GONG, Jinpeng JIANG, Chengen LI
Affiliations
  • National Key Laboratory of Science and Technology on Nearspace Vehicle Technology, Beijing, 100076
出版时间: 2025-12-25 doi: 10.7654/j.issn.2097-1974.20250604
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超燃冲压发动机通常采用燃油再生冷却的方式对壁面进行降温,超临界CO2循环系统作为一种高效能热机,可以将这部分热量加以回收利用,产生电能供电器设备使用,同时降低了冷却所需燃料用量,有效提升了发动机整体性能。对基于超临界CO2循环发电系统的超燃冲压发动机冷却系统进行了总体参数分析,得到该系统可产生的电能和循环效率,同时,评估了压气机压比、涡轮前温度、发动机热量输入、压气机入口温度、压气机等熵效率、涡轮等熵效率对系统发电量及效率的影响,应用多目标遗传算法评估了系统最大发电量及发电效率,对关键部件预冷器及压气机开展了设计。

超燃冲压发动机  /  超临界CO2  /  发电系统  /  再生冷却  /  循环效率

The scramjet engine usually employs a fuel regeneration cooling system to cool the walls. As a highly efficient thermal engine, the supercritical carbon dioxide (S-CO2) cycle system can recover and utilize heat energy to generate electricity to power equipment while reducing the amount of fuel needed for cooling and effectively enhancing the engine's overall performance. An overall parametric analysis of the cooling system for the scramjet engine is conducted based on the supercritical CO2 cycle power generation system, obtaining a system-generated power output of 65kW and a cycle efficiency of 11.75%. Additionally, the impact of various parameters is evaluated such as compressor pressure ratio, turbine inlet temperature, engine heat input, compressor inlet temperature, compressor isentropic efficiency, and turbine isentropic efficiency on system power generation and efficiency. Using a multi-objective genetic algorithm, the maximum power output and efficiency of the system are assessed, and preliminary designs for key components including the precooler and compressor are conducted.

scramjet engine  /  supercritical CO2  /  power generation system  /  regeneration cooling  /  cycle efficiency
朱鹏举, 孙羽, 巩帆, 姜金朋, 李承恩. 基于超临界CO2循环的超燃冲压发动机再生冷却系统. 导弹与航天运载技术(中英文), 2025 , 48 (6) : 26 -32 . DOI: 10.7654/j.issn.2097-1974.20250604
Pengju ZHU, Yu SUN, Fan GONG, Jinpeng JIANG, Chengen LI. Regenerative Cooling System for Scramjet Engine Based on Supercritical CO2 Cycle[J]. Missiles and Space Vehicles, 2025 , 48 (6) : 26 -32 . DOI: 10.7654/j.issn.2097-1974.20250604
高速巡航飞行器在跨大气层内以极高的速度飞行,可以有效减少飞行时间和防御响应时间,增强突防和反防御能力,具有高机动性,是当今世界航空航天事业发展的一个重要方向1。超燃冲压发动机作为其主要动力来源,具有远高于火箭发动机的比冲,如图1所示2。由于飞行速度快,超燃冲压发动机在工作时承受着非常高的温度。来流空气的滞止温度在马赫数为4、6、8时分别为860 K、1 640 K、2 580 K。空气在燃烧室中与燃油混合燃烧之后,气体温度会进一步提高,在马赫数为4、6、8时分别为2 500 K、2 700 K、3 100 K3。如此恶劣的热环境,现有的材料即使覆有热障涂层,在没有被冷却的情况下也无法长时间工作,因此超燃冲压发动机通常采用燃油再生冷却的方式对发动机流道壁面进行冷却,即冷的燃油先经过发动机壁面对其进行冷却,而后喷注进燃烧室进行燃烧4
与其被动地对热进行防护,不如主动地将其利用。对于飞行器来说,发动机壁面提供了源源不断的热能,油箱中贮存的燃油可以作为冷源,因此可以构建热电转换系统。一方面,产生的电能可以用来为飞行器上的电气设备供电,减少供电电池携带数量,增加装填空间。另一方面,发动机壁面导入的热量被部分转化为电能,剩余部分所需要的冷却燃油用量将会减小,意味着燃烧室壁面温度可以进一步提升,超燃冲压发动机的性能可以得到更大程度的突破。
热电转换技术在电力领域及热能工程领域并不罕见5,但在高速飞行器以及超燃冲压发动机领域,在近十几年才逐渐受到关注。
秦江等6提出了基于碱金属朗肯循环的超燃冲压发动机热管理方法,有效缓解发动机冷却压力的同时,为飞行器提供电能,系统发电效率可达32.22%。Bao等7提出了以He-Xe混合物为循环工质的闭式布雷顿循环发电系统,在忽略燃料冷却剂的流量限制时,其转换效率可以达到30.42%。Sforza8提出采用以碳氢燃料为工质的半闭式朗肯循环超燃冲压发动机发电系统。燃料流入发动机壁面换热器进行吸热后,一部分流入过热器升温变为蒸气,推动涡轮进行做功发电,涡轮流出的乏汽冷凝后回到油箱。马喆等9提出了一种布雷顿热电转换系统用于回收飞行器气动热,对比了空气、超临界CO2以及氦气作为循环工质的优劣。热源为冲压空气,冷源为设备舱的排气,系统发电功率为6 kW,发电效率5.8%。Cheng等10提出采用半导体温差热电器回收高速飞行器的热量,最大转换效率可以达到5%。曹林炜11针对气动热建立了不同工质的闭式朗肯循环热电转换系统模型,对系统关键部件进行了三维数值模拟设计仿真。石蕊等12通过在发动机燃烧室壁面安装一层半导体层,并在半导体层外部设计冷却工质回路,设计了一种热力循环与半导体温差结合的发电系统。
由于超临界CO2循环发电系统具有高发电效率以及结构紧凑等优势,部分学者开展了超临界CO2循环发电系统在高速飞行器热管理方面的研究。姜培学等13建立了以超临界CO2为循环工质的高效热防护与高温发电一体化系统,分析了简单闭式循环、回热循环、部分冷却再压缩循环的系统性能,认为受限于冷源热沉,再压缩循环效率不及简单循环,回热循环可以有效提升发电功率,但系统复杂度更高,部件更多。苗鹤洋14开展了基于超临界CO2循环的超燃冲压发动机热电转换系统建模及分析,耦合了超燃冲压发动机壁面传热模型,重点对再压缩循环性能提升开展研究,在发动机壁面最高温度1 200 K的条件下,系统发电功率最高达198.7 kW。
超临界CO2布雷顿循环系统的工作原理为,压力温度相对较低的CO2(仍高于CO2临界压力温度)首先在压气机中增压,然后进入高温换热器中吸收热量提高温度,具有高温高压的CO2在涡轮中膨胀做功,驱动发电机产生电能,最后做功完成之后的乏汽(高温低压超临界CO2)再经过预冷器将温度降低至循环初始的低温低压状态,重新开始循环。基本循环系统主要包括压气机、高温换热器、涡轮、发电机、预冷器,通过在系统中增加额外的回热器、压气机、涡轮等设备,可以构成循环效率更高的回热循环、再压缩循环、再热循环等,目前公认再压缩循环可以获得最高的循环效率,可达50%以上15
本文构建了基于超临界CO2循环发电系统的超燃冲压发动机冷却系统总体性能分析模型,分析了超临界CO2基本循环发电系统的发电功率及循环效率随压气机压比、涡轮前温度与发动机热量输入的变化关系,并通过多目标优化算法求出了在现有约束条件下最大发电功率及最佳循环效率。同时,对关键部件预冷器及压气机开展了设计。
基于超临界CO2基本循环的超燃冲压发动机再生冷却系统如图2所示。与传统的超燃冲压发动机再生冷却不同,超临界CO2取代了碳氢燃料对发动机壁面进行冷却,吸收热量之后通过涡轮做功,驱动发电机输出电能。而燃油在进入发动机燃烧之前,先经过预冷器冷却高温CO2,将无法被有效转化的废热重新带入燃烧室,提升燃烧效率。
将超临界CO2的循环过程分别用数字表示,1→2表示增压过程,2→3表示在发动机壁面吸热过程,3→4表示在涡轮中膨胀做功过程,4→1表示与燃油换热被冷却的过程。CO2的临界点温度、压力值分别为304.13 K、7 380 kPa,为避开近临界点CO2物性剧烈变化区域,给定压气机前的温度T1、压力P1值为310 K、7 500 kPa。根据相关文献研究结果,压气机、涡轮的等熵效率为0.7316、0.8717。考虑到过高的内部压强将导致材料强度难以满足要求,因此分析过程中最大压比设置为3.5。同时考虑材料的耐温极限,给定涡轮前温度T3不超过1 100 K。CO2流经发动机壁面换热通道与预冷器的压力损失系数均为0.1,发电机发电效率为0.99。CO2的物性参数通过Refprop软件进行调用。
预冷器采用承压能力强、换热效率高的印刷电路板式换热器18,热超临界CO2与冷煤油为逆流形式。因为在临界点附近,超临界CO2物性参数变化剧烈,为了精确计算换热性能,建模时将换热器分解为若干个单元,如图3所示,给定换热量及边界条件后,各个单元依次计算迭代,求出各单元进出口热力参数。模型基于前期相关工作搭建19,主要的换热计算公式如下:
Hh,i-Hh,i+1Hc,i-Hc,i+1hhAhTav,h,i-Twall,ihcAcTwall,i-Tav,c,ihATav,h,i-Tav,c,i=QN
式中下标i为第i个单元;下标h代表热流体;下标c代表冷流体;Tav为单元进(Ti )、出(Ti+1)口平均温度;Twall为冷流与热流之间的壁面温度;H为流体焓值;h为换热系数;A为换热面积;Q为换热功率;N为换热器单元总数。
压气机采用单级离心式压气机,通过建立一维设计程序,计算得到压气机各叶片截面参数,包括几何尺寸、速度三角形、热力参数,并依据设计准则对叶片沿子午流线方向以及展向进行参数化造型。
分析时采用的发动机模型如图4所示20。入口宽度为125 mm,高度为100 mm,出口宽度为125 mm,高度为300 mm,全长为2.13 m。当入口来流马赫数为6时,隔离段入口气流总压为1 680 kPa,总温为1 200 K,马赫数为2.38,油气当量比为0.55。在此来流条件下,发动机壁面的热流条件随轴向长度x的变化规律如下20
qx=1.125x2-0.375x+0.28, 0<x0.4 mqx=0.376x2-0.459x+0.434, 0.4<x1.5 mqx=1.093x2-3.922x+4.012, 1.5<x2.13 m
积分可得,发动机壁面向外传递的总热量为554 kW。
出口焓值H2可由式(3)得到:
H2=H2S-H1ηc+H1
式中 ηc为压气机等熵效率;下标2s为等熵压缩点,即2s点熵值与2点相等。
系统中CO2的循环流量M
M=HfdjH3-H2
式中 Hfdj表示发动机壁面向外传递的总热量。
涡轮出口焓值可由式(5)计算:
H4=H3-H3-H4S×ηt
系统发电功率W及循环效率η
W=H3-H4-H2-H1×Mη=PHfdj
通过计算,得到超临界CO2循环发电系统各状态点热力学参数如表1所示。系统发电功率为65.1 kW,循环效率为11.75%,CO2流量为0.996 kg/s。可以看出,系统产生的电量非常可观,基本可以满足飞行器上电气设备的用电需求,减轻电池质量。为进一步提升循环发电效率及发电量,就超临界CO2基本循环发电系统的发电功率及循环效率随压气机压比、涡轮前温度、发动机热量输入、压气机入口温度、压气机等熵效率、涡轮等熵效率的变化关系分别展开了研究,当某一自变量变化时,其余自变量均保持不变。
图5展示了发电功率、循环效率与CO2流量随压气机压比的变化规律,可以看出,在热量输入与涡轮前温度不变的情况下,所有参数均随着压气机的压比增加而增加,即压气机压缩性能的优劣直接影响着发电功率及效率。为了获得更好的系统性能,应该尽可能提升压气机压比,但是,过高的压力将会对系统结构产生一系列的问题,包括系统安全性、管道密封难度以及部件效率损失增大等,考虑到工程可实现性,建议压比低于3.5。
图6展示了发电功率、循环效率与CO2流量随涡轮前温度的变化规律,可以看出,当发动机输入热量固定在554 kW时,发电量与循环效率在涡轮前温度小于850 K时,均呈现快速增长的情况,当温度超过850 K后,则保持平稳并出现缓慢下降趋势。这是因为发动机输入热量限制了发电循环的效率,即涡轮前温度在850 K附近时,整个发电循环已经可以最大限度地利用发动机554 kW输出热量进行发电,再提升涡轮前温度不会提升发电效率,但可以减少CO2流量,缩小发电系统规模。因此,对于固定发动机热量输入,存在一个最佳涡轮前温度,使得系统发电量与循环效率最优。
图7展示了发电功率、循环效率与CO2流量随发动机热量输入的变化规律,可以看出,循环效率与热量输入无关,仅与压气机压比和涡轮前温度相关,而系统发电量及流量均与发动机热量输入存在正比例关系。也就是说,同样性能的超临界CO2循环系统应用于不同尺度的超燃冲压发动机,其对再生冷却以及发动机性能的改善情况不变,但其产生的输出功随发动机尺度增大而增大。
图8展示了发电功率、循环效率与CO2流量随压气机入口温度的变化规律,可以看出,随着压气机入口温度的升高,发电功率与系统循环效率显著下降,当温度从310 K增加至450 K时,发电功率从65 kW下降至2 kW,循环效率从12%下降至0.4%。由于涡轮入口温度保持1 100 K不变,温差减小后超临界CO2工质的吸热能力减小,因此循环流量需要相应增加,压气机入口温度为450 K时,CO2流量需要增加至2 kg/s。因此,系统部件设计时,预冷器的设计就显得非常关键,其需要具备优异的换热效率使得经过预冷器的工质温度尽量降低到310 K。
图9展示了发电功率、循环效率与CO2流量随压气机等熵效率的变化规律,可以看出,随着压气机等熵效率从0.5上升至0.95,发电功率与循环效率均显著增加,系统所需的循环工质流量有所降低。说明系统关键部件设计的优劣直接影响着整个系统的性能,压气机等熵效率从0.73下降20%,系统发电量及发电效率相应下降27.6%。
图10展示了发电功率、循环效率与CO2流量随涡轮等熵效率的变化规律,可以看出,随着涡轮等熵效率从0.55上升至0.99,发电功率从27 kW显著增加至80 kW,循环效率从5%提升至14.5%。涡轮等熵效率的提升并不影响工质吸热能力,因此循环流量没有变化。对比压气机等熵效率的影响可以看出,涡轮的性能优劣对整个系统性能的影响更加显著。
运用多目标优化遗传算法,对压气机压比与涡轮前温度参数进行优化,给定其变化范围分别为1.5~3.5与600~1 100 K。得到在发动机热量输入为554 kW条件下,超临界CO2循环最大发电功率与最佳循环效率分别为86.3 kW、15.6%,此时压气机压比为3.5,涡轮前温度为1 000 K。86.3 kW电量已满足飞行器使用,在现有条件下继续提高发电效率可通过增加回热循环或提高压气机压比等方式。但对于飞行器来说,增加回热会带来更多的结构质量,反而不利于飞行器总体性能。同时可以看出,压气机压比已经达到限制范围上限,此时压气机出口压力达到26 250 kPa,再大将为压气机强刚度设计带来较大困难。
表2给出了预冷器设计结果,尺寸包络为0.8 m×1.2 m×0.01 m,为了尽量减少飞行器空间的占用,高度设计为0.01 m,可与发动机外壁或舱体内壁随形设计。煤油最高温度为625 K,未达到发生裂解温度,因此不会产生结焦问题。
压气机设计结果见表3,离心压气机建模见图11
通过上述设计结果可以看出,超临界CO2系统压气机尺寸极小,整个压气机加涡轮轴系与壳体包络为50 mm×50 mm×100 mm,质量不超过5 kg,对于飞行器使用来说优势显著。
本文对基于超临界CO2循环发电系统的超燃冲压发动机冷却系统进行了总体参数分析与系统设计,该系统可以产生65.1 kW的电量,转换效率11.75%,减少飞行器供电电池携带质量50 kg以上,有效提升超燃冲压发动机再生冷却效率18%。运用多目标优化遗传算法,得到该系统最大发电功率与最佳循环效率分别为86.3 kW、15.6%,此时压气机压比为3.5,涡轮前温度为1 000 K,为满足用电使用、结构可实现性约束下的最优方案。预冷器总质量为27.3 kg,尺寸包络为0.8 m×1.2 m×0.01 m,冷却通道直径1 mm,冷却通道间距3 mm,层板高度2 mm。压气机直径28.8 mm,叶片厚度0.6 mm,整个压气机加涡轮轴系与壳体包络为50 mm×50 mm×100 mm,质量不超过5 kg。
对于大航程巡航飞行器来说,其用电量大幅度提升,过大的电池质量严重限制了飞行器总体性能,通过超临界CO2发电系统的应用,将有效解决这一问题。
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doi: 10.7654/j.issn.2097-1974.20250604
  • 接收时间:2025-07-05
  • 首发时间:2026-01-20
  • 出版时间:2025-12-25
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  • 收稿日期:2025-07-05
  • 修回日期:2025-11-23
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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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