数字式活塞压力计的研制

介绍了一种集活塞压力计和数字压力计优点于一身的数字式活塞压力计,其改变了传统活塞压力计的设计方案,并在传动密封和系统校准技术方面有了很大的创新,对于现场校准和提高压力计量校准的自动化程度有深远意义。     

渗透法标准湿度发生器中渗透管的研制

详细介绍了适用于低湿测量领域、现场校准的内渗式渗透法标准湿度发生器中渗透管的设计、制作与使用寿命分析及使用注意事项。     

变温热源等温加热修正不可逆回热Brayton循环功率优化

根据有限时间热力学理论,在给定各换热器总热导率的情况下,对变温热源条件下等温加热过程修正的不可逆回热式Brayton循环的功率特性进行了优化.研究表明,该情况下全局性的优化结果并不存在.在给定CCC(收敛型燃烧室)和回热器热导率分配的情况下,通过数值计算,得到了最佳的透平出口温度及RCC(常规燃烧室)和低温侧换热器的热...     

航空发动机室内台架推力测量修正方法研究

为解决缺少标准发动机而不能对试车台进行定期校准来确定试车台推力修正值的问题,通过数据统计分析方法,得到台架的发动机推力修正值;通过台架气动流场参数测试,计算出气动冲量、喷口负压和迎风阻力等对发动机推力的影响,并根据验证统计数据,分析了推力修正值的合理性。     

电子设备射流送风冷却特性试验研究

射流送风是载人航天器密封舱内电子设备冷却的一种有效方式,具有简单可靠、系统质量轻、换热系数大等优点.文章对中国载人航天器密封舱内2台大功耗电子设备射流送风冷却特性进行了试验研究,分析了射流风量、送风孔数、表面状态对设备平衡温度的影响.利用不超过0.4m3/min的风量,可将热流密度为315.8W/m2的设备温度控制在5...     

Marangoni heat pipe: An experiment on board MIOsat Italian microsatellite

This article summarizes the activities in preparation of a microgravity experiment to be carried out by using a small technological payload onboard a microsatellite developed by the Italian Space Agency. A dedicated hardware will be developed to investigate innovative heat pipes filled with self-rewetting fluids, i.e. dilute aqueous alcoholic solutions with unique surface tension properties. After a general introduction of the scientific background, the paper is focused on the main activities in preparation of the flight experiment, on the design of the flight hardware and on the experimental planned procedure. The laboratory results achieved on ground in preparation of a flight experiment are also presented, including measurements of fluids physical properties and preliminary heat pipes performances characterization test. From the engineering point of view, the activities dealing with heat pipes filling and sealing are included. The activities for heat pipe characterization conclude the paper.     

捕获轨迹系统并联机构地面标定方法

捕获轨迹系统（CTS）是一种先进的预测外挂物投放轨迹的试验系统，普遍采用六自由度（6-DoF）串联机构作为其运动机构，串联机构因惯性力大和关节累积误差大使其定位精准度不足。相比串联机构，并联机构具有惯性力小和关节误差不累积等优点。采用6-PTRT并联机构作为CTS试验系统的六自由度运动机构，在空间受限的风洞环境中对CTS并联机构进行地面标定：提出动平台位姿的测量和计算方法，建立包含直线驱动平台安装夹角修正的标定模型，并基于非线性最小二乘法辨识结构参数。辨识后CTS并联机构的位移定位准度优于0.1 mm，姿态定位准度优于0.05°，最后以CTS并联机构和常规攻角机构进行8#标模的对比风洞试验。风洞试验结果表明，CTS并联机构的风载定位准度满足测力试验精准度要求。     

ESA再入探测器的某些空气热动力问题

给出了两种不同的再入飞行器:充气的再入和下滑演示器(IRDT)和Huygens.两者的任务都涉及在靠近轨道的条件下再入并均已于2005年完成.概述了IRDT的使命和具体设计问题,综述了IRDT最近飞行的初步结果和ESTEC估计Huygens受到的辐射通量采用的方法.     

Synthesis of Iron-containing Carbon Microparticles from Deoiled Asphalt and Ferrocene

The deoiled asphalt as the carbon source and the ferrocene as the metal source and the catalyst precursor were chosen to synthe-size iron-containing carbon microparticles through co-carbonization at the temperature of about 450 ℃ for 3 h. The resulting products were treated at 2 000 ℃ for 2 h. All samples were examined by high resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD). The results show that the iron particles in the heat-treated material are completely coated by carbon. In addition to the fully filled carbon microparticles as well as hollow carbon ones, also form carbon fibers with hollow centers. The formation mechanism of the as-prepared products was discussed briefly.     

速率转台低角速率校准方法探讨

主要描述速率转台低角速率的一种校准方法,并对该方法进行分析探讨.