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Nuclear thermal rockets, as a revolutionary potential space luanch vehicle, have the capability to significantly reduce the scale of space transportation missions or enhance transportation capacity. The historical research of nuclear thermal propulsion (NTP) technology in the United States and Russia (The Soviet Union) is reviewed, the development challenges of nuclear thermal rocket are analysed. By proposing feasible lunar return missions and manned Mars exploration transportation tasks for nuclear thermal rocket, the study examines key technological challenges form an engineering application perspective, including optimization of overall parameters, high-power thermal propulsion, nuclear safety design and protection. At the end of the research, it is suggested to strengthen the research and development of key nuclear thermal rocket technologies and promote the construction of non nuclear and nuclear testing capabilities.
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核热运载器作为一种具有革命性潜力的航天运输工具,能够显著降低空间轨道运输的任务规模或提升运输能力。简要介绍了美国和俄罗斯(苏联)的核热运载器研发历程,分析了其走向工程应用所面临的发展挑战。设计了适用于核热运载器的地月往返重复运输和载人火星探测运输的任务剖面,从工程应用角度,研究了核热运载器总体优化、大功率核热火箭发动机、核安全设计与辐射防护等关键技术问题。最后,建议加强核热运载器关键技术攻关,推进非核与带核试验能力建设。
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吴胜宝(1985—),男,研究员,主要研究方向为运载火箭总体设计。
郝宇星(1992—),男,工程师,主要研究方向为运载火箭总体设计。
李 扬(1981—),女,研究员,主要研究方向为运载火箭总体设计。
王 旭(1996—),男,博士,工程师,主要研究方向为空间先进推进技术。
艾立强(1992—),男,博士,高级工程师,主要研究方向为飞行器热控。
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1.中国运载火箭技术研究院研究发展中心,北京,100076)]), AuthorCompany(id=1261025909767811149, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, xref=2., ext=[AuthorCompanyExt(id=1261025909788782670, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, companyId=1261025909767811149, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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核热火箭发动机原理示意, figureFileSmall=FC3AdpoWXe15NCP0EWYXKQ==, figureFileBig=8kispN8s+AK1stf9PC3TbQ==, tableContent=null), ArticleFig(id=1261025928931586263, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=EN, label=Fig.2, caption=
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运载器出发规模与速度增量关系, figureFileSmall=3tA0Ej4d0s21XR5IKWVt5Q==, figureFileBig=zaAPM43YRp2+y6MbRhWr2g==, tableContent=null), ArticleFig(id=1261025930001133791, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=EN, label=Fig.3, caption=
Relationship between critical velocity increment and payload scale, figureFileSmall=WjsqMj1Hilw9D8lsuXoW9A==, figureFileBig=v9ni52RZYGBmIsR5cD69uA==, tableContent=null), ArticleFig(id=1261025932014399714, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=CN, label=图3, caption=
临界速度增量与有效载荷规模关系, figureFileSmall=WjsqMj1Hilw9D8lsuXoW9A==, figureFileBig=v9ni52RZYGBmIsR5cD69uA==, tableContent=null), ArticleFig(id=1261025932308000997, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=EN, label=Fig.4, caption=
Flight profile of earth-moon round-trip transportation mission, figureFileSmall=w9puKx07VfSxgL6ySowk+g==, figureFileBig=yplFti+taTk5N2jAkRqTWA==, tableContent=null), ArticleFig(id=1261025932735820008, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=CN, label=图4, caption=
地月往返运输任务飞行剖面, figureFileSmall=w9puKx07VfSxgL6ySowk+g==, figureFileBig=yplFti+taTk5N2jAkRqTWA==, tableContent=null), ArticleFig(id=1261025933021032682, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=EN, label=Fig.5, caption=
Typical mission profile for manned Mars transportation, figureFileSmall=HeGWIC6p/6jtxLLA4KxABA==, figureFileBig=41qDCj8xXGiGGvrjOaAQbg==, tableContent=null), ArticleFig(id=1261025933197193454, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=CN, label=图5, caption=
典型载人火星运输任务剖面, figureFileSmall=HeGWIC6p/6jtxLLA4KxABA==, figureFileBig=41qDCj8xXGiGGvrjOaAQbg==, tableContent=null), ArticleFig(id=1261025933285273841, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=EN, label=Fig.6, caption=
Variation of liquid hydrogen evaporation during Earth-Mars transfer, figureFileSmall=t31tBEDzJ5RlpK96edYSzA==, figureFileBig=pj6h1knFqN4yIcK+CEQRPw==, tableContent=null), ArticleFig(id=1261025933734064377, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=CN, label=图6, caption=
地火转移过程中液氢蒸发量变化, figureFileSmall=t31tBEDzJ5RlpK96edYSzA==, figureFileBig=pj6h1knFqN4yIcK+CEQRPw==, tableContent=null), ArticleFig(id=1261025933968945406, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=EN, label=Fig.7, caption=
Nuclear thermal launch vehicle, figureFileSmall=8Zr0QFvzFjaTdSlBhulMsQ==, figureFileBig=tTBPzSwt8xViugA3Az185A==, tableContent=null), ArticleFig(id=1261025934279323903, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=CN, label=图7, caption=
核热运载器, figureFileSmall=8Zr0QFvzFjaTdSlBhulMsQ==, figureFileBig=tTBPzSwt8xViugA3Az185A==, tableContent=null), ArticleFig(id=1261025934451290375, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=EN, label=Fig.8, caption=
Nuclear thermal vehicle module, figureFileSmall=2uICUa8kZuTXFwkcrDE07A==, figureFileBig=oFkJyhp7zcJkwAj2tkEjWA==, tableContent=null), ArticleFig(id=1261025935759913223, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=CN, label=图8, caption=
核热运载器舱段, figureFileSmall=2uICUa8kZuTXFwkcrDE07A==, figureFileBig=oFkJyhp7zcJkwAj2tkEjWA==, tableContent=null), ArticleFig(id=1261025935923491081, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=EN, label=Fig.9, caption=
Shielding performance laws of shielding materials, figureFileSmall=sIwVUV2hwiQI4gtnXm/v1Q==, figureFileBig=o35S7da6h6SeLlnQN8GjJw==, tableContent=null), ArticleFig(id=1261025936305172751, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=CN, label=图9, caption=
屏蔽材料的屏蔽性能规律, figureFileSmall=sIwVUV2hwiQI4gtnXm/v1Q==, figureFileBig=o35S7da6h6SeLlnQN8GjJw==, tableContent=null), ArticleFig(id=1261025936745574677, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=EN, label=Tab.1, caption=
Scale of Earth-Mars round-trip transportation system
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| 类型 | 运输规模估计/t | 比冲/s |
|---|
| 氢氧运载器 | 500~700 | 450 |
| 核热运载器 | ~300 | 900 |
), ArticleFig(id=1261025937202753817, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=CN, label=表1, caption=
地火往返运输系统规模
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| 类型 | 运输规模估计/t | 比冲/s |
|---|
| 氢氧运载器 | 500~700 | 450 |
| 核热运载器 | ~300 | 900 |
), ArticleFig(id=1261025937425051934, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=EN, label=Tab.2, caption=
Results of active and passive evaporation control for liquid hydrogen propellant
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| 运载器位置 | 日蒸发量/kg | 日蒸发率/% |
|---|
| 近地轨道 | 最大值 | 12.16 | 0.017 |
| 最小值 | 7.84 | 0.011 |
| 地火转移 | 最大值 | 8.43 | 0.012 |
| 最小值 | 1.44 | 0.002 |
| 环火飞行 | 最大值 | 4.57 | 0.006 |
| 最小值 | 3.74 | 0.005 |
), ArticleFig(id=1261025937601212706, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=CN, label=表2, caption=
液氢工质主被动蒸发量控制结果
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| 运载器位置 | 日蒸发量/kg | 日蒸发率/% |
|---|
| 近地轨道 | 最大值 | 12.16 | 0.017 |
| 最小值 | 7.84 | 0.011 |
| 地火转移 | 最大值 | 8.43 | 0.012 |
| 最小值 | 1.44 | 0.002 |
| 环火飞行 | 最大值 | 4.57 | 0.006 |
| 最小值 | 3.74 | 0.005 |
), ArticleFig(id=1261025937961922853, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=EN, label=Tab.3, caption=
Typical core scheme of nuclear thermal propulsion reactor
, figureFileSmall=null, figureFileBig=null, tableContent=
| 堆芯方案 | 优点 | 缺点 | 功率密度 | 技术 成熟度 |
|---|
NERVA 蜂窝式换热 结构堆芯 | 技术成熟、中子慢化强、耐高温 | 体积大、易腐蚀、换热差 | 中 | 高 |
CERMET 金属陶瓷燃料堆芯 | 高温适应、耐腐蚀、裂变产物包容度好 | 质量大、成本高、制造复杂 | 较高 | 中 |
PBR 颗粒床反应堆堆芯 | 换热优、高功率密度、轻质 | 结构复杂、冷却不均、实现难 | 高 | 中 |
MITEE 微型反应堆 发动机堆芯 | 最轻量、换热好、微型适配 | 功率低、局限性强、数据不足 | 较高 | 较低 |
CIS 三元碳化物 燃料堆芯 | 耐高温、结构优化、材料先进 | 制造难、结构复杂、设计要求高 | 中 | 较高 |
SCCTE 低浓铀燃料 堆芯 | 安全高、低浓铀、防扩散、成本低 | 功率低、在研阶段、验证不足 | 低 | 低 |
), ArticleFig(id=1261025938066780459, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=CN, label=表3, caption=
核热推进反应堆典型堆芯方案
, figureFileSmall=null, figureFileBig=null, tableContent=
| 堆芯方案 | 优点 | 缺点 | 功率密度 | 技术 成熟度 |
|---|
NERVA 蜂窝式换热 结构堆芯 | 技术成熟、中子慢化强、耐高温 | 体积大、易腐蚀、换热差 | 中 | 高 |
CERMET 金属陶瓷燃料堆芯 | 高温适应、耐腐蚀、裂变产物包容度好 | 质量大、成本高、制造复杂 | 较高 | 中 |
PBR 颗粒床反应堆堆芯 | 换热优、高功率密度、轻质 | 结构复杂、冷却不均、实现难 | 高 | 中 |
MITEE 微型反应堆 发动机堆芯 | 最轻量、换热好、微型适配 | 功率低、局限性强、数据不足 | 较高 | 较低 |
CIS 三元碳化物 燃料堆芯 | 耐高温、结构优化、材料先进 | 制造难、结构复杂、设计要求高 | 中 | 较高 |
SCCTE 低浓铀燃料 堆芯 | 安全高、低浓铀、防扩散、成本低 | 功率低、在研阶段、验证不足 | 低 | 低 |
), ArticleFig(id=1261025938448462126, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=EN, label=Tab.4, caption=
Safety design principles for nuclear thermal launch vehicle applications
, figureFileSmall=null, figureFileBig=null, tableContent=
| 类别 | 因素 | 设计原则 |
|---|
| 试验与地面操作安全 | 整机试验安全 | 发动机喷出的含辐射燃气不能直接排入大气,需要搜集和处理 |
| 地面操作安全 | 在核燃料运输、装配、测试等环节中保证安全,避免碰撞、坠落,确保放射源的辐射剂量在限值内 |
| 飞行任务全周期安全 | 发射前安全 | 反应堆在发射场保持在次临界状态 |
| 入轨发射安全 | 反应堆在发射中保持在次临界状态,必须在达到指定轨道(通常是高度超过800 km轨道)后启动 |
| 在轨运行安全 | 反应堆考虑地球轨道碎片撞击的可能性,并将影响降至最低 |
| 任务后处置安全 | 将反应堆系统推至更高的“坟墓轨道”,在放射性核素衰变到安全水平之前不会重返大气层 |
| 事故下安全与风险降低 | 发射中止安全 | 在所有可能的发射失败场景下(如爆炸、撞击、坠毁),反应堆结构能最大限度地保持完整或者在高空完全烧毁并完全扩散 |
飞行任务中止 安全 | 应有足够的备用推进能力将反应堆置于预定或备用安全轨道 |
| 意外再入安全 | 反应堆应保证完整或全部放射性物质在高空扩散 |
), ArticleFig(id=1261025938855309617, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=CN, label=表4, caption=
核热运载器应用安全设计原则
, figureFileSmall=null, figureFileBig=null, tableContent=
| 类别 | 因素 | 设计原则 |
|---|
| 试验与地面操作安全 | 整机试验安全 | 发动机喷出的含辐射燃气不能直接排入大气,需要搜集和处理 |
| 地面操作安全 | 在核燃料运输、装配、测试等环节中保证安全,避免碰撞、坠落,确保放射源的辐射剂量在限值内 |
| 飞行任务全周期安全 | 发射前安全 | 反应堆在发射场保持在次临界状态 |
| 入轨发射安全 | 反应堆在发射中保持在次临界状态,必须在达到指定轨道(通常是高度超过800 km轨道)后启动 |
| 在轨运行安全 | 反应堆考虑地球轨道碎片撞击的可能性,并将影响降至最低 |
| 任务后处置安全 | 将反应堆系统推至更高的“坟墓轨道”,在放射性核素衰变到安全水平之前不会重返大气层 |
| 事故下安全与风险降低 | 发射中止安全 | 在所有可能的发射失败场景下(如爆炸、撞击、坠毁),反应堆结构能最大限度地保持完整或者在高空完全烧毁并完全扩散 |
飞行任务中止 安全 | 应有足够的备用推进能力将反应堆置于预定或备用安全轨道 |
| 意外再入安全 | 反应堆应保证完整或全部放射性物质在高空扩散 |
), ArticleFig(id=1261025939262157107, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=EN, label=Tab.5, caption=
Potential accident analysis of nuclear thermal launch vehicle during the full mission cycle
, figureFileSmall=null, figureFileBig=null, tableContent=
| 任务阶段 | 任务阶段定义 | 潜在事故 | 潜在事故结束状态 |
|---|
| 第0阶段 | 在发射场 活动中 | 组装过程中的临界、发生火灾、氢泄漏、爆炸 | 反应堆意外临界、 火灾、爆炸 |
| 第1阶段 | 点火初期 | 发射场内的掉落、解体、爆炸 | 反应堆冷再入、反应堆意外临界、水污染、土地污染、爆炸、火灾 |
| 任务阶段 | 任务阶段定义 | 潜在事故 | 潜在事故结束状态 |
|---|
| 第2阶段 | 上升段中期 | 发射场外区域掉落、解体、爆炸 | 反应堆冷再入、反应堆意外临界、水污染、土地污染、人员伤害、爆炸、火灾 |
| 第3阶段 | 抵达低地球 轨道 | 亚轨道再入、系统运行中止、爆炸 | 反应堆意外临界、冷再入、在大气中燃烧 |
| 第4阶段 | 低轨道至转移轨道 | 轨道再入、系统运行中止、爆炸 | 反应堆意外临界、冷再入 |
| 第5阶段 | 运行工作轨道 | 意外再入、反应性偏移、热控失灵 | 意外临界、芯热拆解、 热再入 |
高轨道 处理 | 反应堆的最终处置 | 寿终后过早再入地球 | 热再入 |
), ArticleFig(id=1261025941015376181, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1261021845285908485, language=CN, label=表5, caption=
核热运载器全任务周期内潜在事故分析
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| 任务阶段 | 任务阶段定义 | 潜在事故 | 潜在事故结束状态 |
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| 第0阶段 | 在发射场 活动中 | 组装过程中的临界、发生火灾、氢泄漏、爆炸 | 反应堆意外临界、 火灾、爆炸 |
| 第1阶段 | 点火初期 | 发射场内的掉落、解体、爆炸 | 反应堆冷再入、反应堆意外临界、水污染、土地污染、爆炸、火灾 |
| 任务阶段 | 任务阶段定义 | 潜在事故 | 潜在事故结束状态 |
|---|
| 第2阶段 | 上升段中期 | 发射场外区域掉落、解体、爆炸 | 反应堆冷再入、反应堆意外临界、水污染、土地污染、人员伤害、爆炸、火灾 |
| 第3阶段 | 抵达低地球 轨道 | 亚轨道再入、系统运行中止、爆炸 | 反应堆意外临界、冷再入、在大气中燃烧 |
| 第4阶段 | 低轨道至转移轨道 | 轨道再入、系统运行中止、爆炸 | 反应堆意外临界、冷再入 |
| 第5阶段 | 运行工作轨道 | 意外再入、反应性偏移、热控失灵 | 意外临界、芯热拆解、 热再入 |
高轨道 处理 | 反应堆的最终处置 | 寿终后过早再入地球 | 热再入 |
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