高超声速多体干扰与分离试验

进行了高超声速飞行器多体系统分离过程中存在的气动力干扰试验研究.试验模型是某构型的可重复使用航天飞行器,由助推器以及再入体两部分组成.研究在FL-31风洞中进行,试验马赫数为Ma=6.97.试验结果表明:分离过程中助推器和再入体之间存在复杂的激波干扰现象,多体系统分离过程中的气动干扰本质上是激波干扰引发的.      

气-气冷流掺混流场缩尺技术

 为研究气-气冷流掺混流场缩尺技术,对多组分气相掺混流动三维Navier-Stokes无量纲方程及其定解条件进行了相似性分析,并将量纲分析方法应用到气-气掺混流动现象中,获得了气-气掺混流场相似准则,该相似准则表明冷流掺混试验件尺寸和试验背压都可以变化;运用该准则,在不同背压工况下进行了3个不同尺寸试验件的单喷嘴气-气喷注器掺混流场的仿真分析和比较,结果表明不同试验件尺寸和不同压力工况下气-气掺混流场具有相似性。研究结果能够指导气-气冷流试验,并为气-气燃烧流场缩尺技术研究提供参考。     

在社会主义初级阶段解析儒家社会理想中的小康社会

儒家的小康社会是指在古代自然经济条件下,政治清明、百姓生活宽裕且安居乐业的社会图景。随着建设中国特色社会主义事业的推进,其内涵和外延不断地丰富和发展,今天的小康社会是对"小康社会"重新定义下的最新诠释。我们要坚持以德治国和依法治国相结合的治国方略,与时俱进地发展和完善"小康社会"的概念及其内涵与外延,为实现全面建成小康社会服务。     

A model of foreground emission in UV using GALEX deep observations

Foreground emission, mainly airglow and zodiacal light, is a significant contributor in an ultraviolet observation especially from low earth orbit. Its careful estimation and removal are tedious yet unavoidable processes in the study of diffuse UV radiation and by extension interstellar dust studies. Our analysis of deep GALEX observations show that airglow is not only a function of Sun angle but also a strong function of Solar activity at the time of observation. We present here an empirical model of airglow emission, derived from GALEX deep observations, as a function of 10.7 cm Solar flux and Sun angle. We obtained the model by training machine learning models on the data using a variant of the regression algorithm that is both resilient toward outlier data and sensitive to the complexities of the provided data. Our model predictions across various observations show no loss in generalization as well as good agreement with the observed values. We find that the total airglow in an observation is the sum of a baseline part (AG_c) that depends on the Solar flux and Sun angle, and a variable part (AG_v) that depends on the Sun angle and the time of observation with respect to local midnight. We also find that the total airglow can vary between 85 – 390 photon units in FUV and 80 – 465 photon units in NUV.     

Derivation and validation of a similarity law for free-flight wind tunnel tests of parallel stage separation

Aiming at the safety problem of the stage separation of parallel reusable high-speed air vehicles, this paper studies the unsteady test method and focuses on deriving a similarity law of parallel stage separation free-flight wind tunnel tests. The new similarity law considers the influences of aerodynamic force and gravity on the motions of the two stages, as well as the influence of aerodynamic interference between the two stages on each other’s motion. From the perspective of multi-angle physical equations, the conditions to ensure that the two-stage separation trajectory of a wind tunnel test is similar to that of a real air vehicle are derived innovatively, so as to ensure the authenticity and credibility of wind tunnel test results. The similarity law is verified by an HIFiRE-5 air vehicle, and the separation trajectories of wind tunnel tests and the real air vehicle are obtained by numerical simulation. The research shows that the similarity law derived in this paper can ensure that wind tunnel free-flight tests have the ability to predict the two-stage separation characteristics of real parallel vehicles. By analyzing the separation trajectory curve of the typical state, it is found that the new method can ensure that the trajectory error of a wind tunnel test does not exceed 1%, which indicates that this method is credible. The establishment of the new method lays the foundation for subsequent wind tunnel tests and provides support for research on the safety of the stage separation of parallel reusable air vehicles.     

太极二号卫星精密热控关键技术及试验验证

针对引力波探测太极二号卫星提出的高稳定度温控需求，开展了高分辨率测温系统和高稳定度热控技术的研究，提出了多级阻尼的热控设计方法，建立了多级阻尼状态空间数学模型，揭示了系统中热量传递特性。该方法在太极二号核心载荷上进行了地面试验验证，试验结果表明核心舱关键仪器的温度满足指标要求。试验结果的噪声分析，不仅验证了精密热控关键技术，而且提出了关于热噪声分析与抑制的新方法，为后续航天器精密热控技术提供了理论分析方法和工程参考依据。     

宜香1A及宜香品种成熟期倒伏指数研究

以籼型三系不育系宜香1A、Ⅱ-32A、冈46A和恢复系宜恢7633、宜恢7008、宜恢1525等为材料,研究了亲本和杂交后代的倒伏指数.结果表明,Ⅱ-32A的倒3节间抗倒能力极显著强于宜香1A;冈46A倒3节间的抗倒能力显著强于宜香1A;宜香1A和Ⅱ-32A所配品种倒3节间抗倒能力相当,都极显著优于冈46A 所配品种倒3节间抗倒能力.母本及其所配品种的倒2节间和倒1节间倒伏指数无明显差异.