姿轨控发动机开机充填和关机传热特性

以双组元姿轨控液体火箭发动机为研究对象,为提高其响应速度和安全可靠性,通过实验和仿真对其开机充填和关机传热特性进行了研究。开展了透明喷注器试验件瞬态流动过程的实验研究,采用高速相机进行液流拍摄,对喷注器试验件瞬态流动过程进行仿真计算,并与实验结果进行对比,验证了流体体积模型计算的合理性。仿真结果表明地面状态各安装方向下...     

Investigations into sensing characteristics of circular thin-plate electrostatic sensors for gas path monitoring

Circular thin-plate electrostatic sensors are promising in gas path monitoring due to their advantages of non-intrusiveness and easy installation. The spatial sensitivity and filtering effect are two important performance parameters. In this paper, an analytically mathematical model of induced charge on a circular thin-plate electrode is first derived. Then the spatial sensitivity and filtering effect of the circular electrostatic sensor are investigated by numerical calculations. Finally,experimental studies are performed to testify the theoretical results. Both theoretical and experimental results demonstrate that circular thin-plate electrostatic sensors act as a low-pass filter in the spatial frequency domain, and both the spatial filtering effect and the temporal frequency response characteristics depend strongly on the spatial position and velocity of the charged particle. These conclusions can provide guidelines for the optimal design of circular thin-plate electrostatic sensors.     

Transient simulation of regression rate on thrust regulation process in hybrid rocket motor

The main goal of this paper is to study the characteristics of regression rate of solid grain during thrust regulation process. For this purpose, an unsteady numerical model of regression rate is established. Gas–solid coupling is considered between the solid grain surface and combustion gas.Dynamic mesh is used to simulate the regression process of the solid fuel surface. Based on this model, numerical simulations on a H2O2/HTPB(hydroxyl-terminated polybutadiene) hybrid motor have been performed in the flow control process. The simulation results show that under the step change of the oxidizer mass flow rate condition, the regression rate cannot reach a stable value instantly because the flow field requires a short time period to adjust. The regression rate increases with the linear gain of oxidizer mass flow rate, and has a higher slope than the relative inlet function of oxidizer flow rate. A shorter regulation time can cause a higher regression rate during regulation process. The results also show that transient calculation can better simulate the instantaneous regression rate in the operation process.     

航天产品外包过程质量控制

贯彻国家军用标准——《质量管理体系要求》,军工企业应加强外包过程质量控制。针对外包过程出现的问题进行分析,提出了航天产品外包过程的质量控制措施,包括落实责任、加强考察评价、过程监控、信息沟通,把住外包产品验收关等方面,通过这些措施,不断改进和完善外包产品的质量控制,以确保外包产品质量满足要求。     

客机载运率指标的优化管理

载运率是航空业内一项重要的生产效率指标。加强载运率管理，分析客机载运率计算过程中的失真因素，采用替代指标弥补载运率的缺陷，是客观评价实际经营成效，也是管理挖潜的重要手段。     

旅游信息

青城山受损古建筑八月前全部重新开放青城山最后一批古建筑维修重建工程已于近日正式开工,青城山所有在地震中受损的古建筑都将于今年八月前完成重建并向游客开放。青城山老君阁也将在今年八月完成重建,不过将从原来的六层长高到八层。     

国际反非法干扰行为的立法实践

随着民用航空业的不断发展，非法干扰民用航空安全行为对民用航空运输的影响越来越大。本文对打击危害国际航空安全犯罪的国际条约的立法过程进行了综述分析，对我国民航有关法律法规立法实践具有一定借鉴意义。     

北京航星机器制造公司车间制造执行系统应用案例分析

本文针对国内航天军工行业的机械加工业务及企业整体信息化水平的发展现状,分析了该行业机械制造业务的特点及生产过程中数据管理的需求,论述了在企业生产制造过程中实施车间制造执行系统(MES)的必要性和紧迫性。根据对企业实际业务需     

EF2000气动与结构

概述了ＥＦ２０００飞机在设计过程中采用的气动与结构综合过程。简要说明了分析方法及该分析的验证过程和合格审定过程。也说明了ＥＦ２０００的综合设计过程，避免了常规方法常常产生的与气动载荷结构界面有关的问题。     

火箭“新面孔”有过人之处

执行此次发射任务的长三乙改进I型火箭,是专为北斗卫星导航系统中圆轨道(MEO轨道)双星发射任务研制的新构型火箭,属于长三甲系列火箭"金牌家族"中的"新面孔"。长三乙改进I型火箭首次"披挂上阵",就执行如此重大的中圆轨道双星发射任务,这个"新面孔"究竟有何过