固体发动机φ200mm带喷管整体缠绕壳体的研制

研制了３台φ２００ｍｍ带喷管不等开口整体缠绕壳休交验了带喷管体整体结构强度,所测壳体的实际爆破压强为１１．６－１３．０ＭＰａ,是设计爆破压强的１．４－１．６倍。     

电弧喷涂参数优化及涂层磨损性能试验研究

采用正交设计方法和通过极差分析研究了电弧喷涂工艺参数对CFB锅炉水冷壁涂层耐磨性的影响。结果表明,影响涂层性能的工艺参数主要是电弧电流,其次是喷涂距离,而电弧电压和雾化空气压力的影响很小。通过涂层冲蚀磨损性能试验,进一步验证了用此最佳喷涂工艺参数组合可以获得良好耐磨性能的涂层。     

多孔板水升华器试验研究

探索了多孔板的制造方法,设计了水结器试验单元件和试验装置;对不同的多孔板升华器进行了试验研究,试验重点研究了热流体入口温度和流量、多孔板物理参数、给水室压力及升华器放置情况对升华器性能的影响。试验结果证明文章提出的升华器基本的设计概念是可行的,并给出了关于水升华器进一步设计的一些有益的结论。     

联合地基GNSS及空基GNSS掩星探测水汽三维分布

研究了联合地基GNSS和空基GNSS掩星观测的大气水汽探测方法。首先,利用COSMIC(气象、电离层、气候星座观测系统)和GRACE(重力恢复与气候实验)无线电掩星产品对对流层层析成像的几个关键技术进行了优化,标定了对流层干延迟模型,建立了新的大气加权平均温度模型,提出了一种新方法用于确定水汽层层顶(即对流层层析模型的顶部边界)。选择香港地区12个连续GNSS气象监测站2017年6月份的数据反演计算了水汽的三维分布,以探空测站的水汽密度为真值,统计层析反演结果与真值之间的偏差为:偏差平均值优于1.36g/m^3,RMS值优于1.70g/m^3。     

Report of the COSPAR mars special regions colloquium

In this paper we present the findings of a COSPAR Mars Special Regions Colloquium held in Rome in 2007. We review and discuss the definition of Mars Special Regions, the physical parameters used to define Mars Special Regions, and physical features on Mars that can be interpreted as Mars Special Regions. We conclude that any region experiencing temperatures > −25 °C for a few hours a year and a water activity > 0.5 can potentially allow the replication of terrestrial microorganisms. Physical features on Mars that can be interpreted as meeting these conditions constitute a Mars Special Region. Based on current knowledge of the martian environment and the conservative nature of planetary protection, the following features constitute Mars Special regions: Gullies and bright streaks associated with them, pasted-on terrain, deep subsurface, dark streaks only on a case-by-case basis, others to be determined. The parameter definition and the associated list of physical features should be re-evaluated on a regular basis.     

Creating Habitable Zones, at all Scales, from Planets to Mud Micro-Habitats, on Earth and on Mars

The factors that create a habitable planet are considered at all scales, from planetary inventories to micro-habitats in soft sediments and intangibles such as habitat linkage. The possibility of habitability first comes about during accretion, as a product of the processes of impact and volatile inventory history. To create habitability water is essential, not only for life but to aid the continual tectonic reworking and erosion that supply key redox contrasts and biochemical substrates to sustain habitability. Mud or soft sediment may be a biochemical prerequisite, to provide accessible substrate and protection. Once life begins, the habitat is widened by the activity of life, both by its management of the greenhouse and by partitioning reductants (e.g. dead organic matter) and oxidants (including waste products). Potential Martian habitats are discussed: by comparison with Earth there are many potential environmental settings on Mars in which life may once have occurred, or may even continue to exist. The long-term evolution of habitability in the Solar System is considered.     

水下气液两相冲压发动机非设计点性能分析

针对水下气液两相冲压发动机非设计工况下运行特性,建立数学模型并开展数值模拟研究,分别分析了通入气体质量流率、航行速度及环境压力变化对发动机性能的影响等,以期全面了解发动机特性,为其设计工作奠定理论基础。计算分析表明:发动机推力随气体质量流率的增大而增大,推进效率随其增大而减小;当实际航行速度大于设计值时,发动机推力略有增大,推进效率在速度为设计值时具有最大值;发动机推力及推进效率均随环境压力增大而略有减小。通过反馈控制调节气体质量流率,可使发动机输出与阻力相近的推力值,使航行体在工作速度范围内的任意速度值下实现匀速航行。     

TBCC发动机涡轮进气道喷水冷却特性数值研究

对涡轮基组合循环(Turbine Based Combined Cycle, TBCC)发动机涡轮进气道进行喷水冷却是解决TBCC发动机推力不连续问题的有效方式之一。本文基于实际流场条件选取某型TBCC发动机涡轮进气道结构,对进气道内喷水冷却特性进行了数值仿真,研究飞行器不同工况下水滴的蒸发特性及喷水对来流高温空气的预冷效果。结果表明,来流空气温度降幅随水气比提高而增大,最高温降可达152.4K。水气比提高后水滴蒸发率逐渐降低,但蒸发总量仍会继续上升。相同水气比条件下,飞行马赫数越高,喷水冷却效果越明显。在Ma3.5飞行速度和水气比0.03条件下有最高蒸发率,达83.05%。喷水冷却有效扩展了涡轮模态飞行马赫数,最高能使飞行速度提升至Ma2.84,即喷水冷却扩展了TBCC从涡轮模态向超燃冲压模态转换的衔接速域。