Experiments of flow and heat transfer performances for air-cooling laminated turbine vane

Flow resistance and heat transfer coefficients of typical double wall laminated film cooling configuration within a turbine vane were experimentally studied.The specimen was in large scale,and made of transparent organic glass.Laminated configuration consisted of double wall laminates,pin-fins,staggered arrays of impingement and film holes.The number ratio of impingement holes,pin-fins and film holes was2∶1∶1.Five experiment vanes were installed in static cascade,and experiments were carried out under constant heat flux.Re of internal cooling air in the experiment was from 104 to 2×105,and Re of external fluid was from 105 to 3×105.The experiment results show that flow resistances of front channel and back channel of the vane are in the same level,and both of them decrease as Re of cooling air increases.Nuof front channel is slightly higher than that of back channel.Both of them increase as Re of cooling air increases.And experiment results were obtained from experiment vanes were compared with that obtained from laminated flat plates,and the tendency of the results agrees well.     

Boundary element method of hydrodynamic characteristics of lubricant in three-leaf dislocated floating-ring bearing

The problem of hydrodynamics of the three-leaf dislocated floating-ring bearing was studied by means of boundary element method.The law including the distribution of pressure on boundary surface(axial,bearing and floating-ring)and its friction loss in different eccentricities was obtained.The results show that the inner friction of three-leaf dislocated bearing increases from 390.875to 1 091.65,and the inner friction of three-leaf dislocated floating-ring bearing increases from 94.2523to 114.5069with eccentricity varying from 0to 0.075in nondimensional.So changing the pressure and flow field of bearing by adding floating-ring is more stability and less wasted work of friction than three-leaf dislocated bearing.     

New Progresses in Lao Satellite Project

The construction of the Lao telecommunications satellite ground station was completed and passed its initial acceptance by a working group assigned by Lao Government in March.The station is located on the Mekong River banks.The station covers 12 hectares,of which 10000m2 are construction area.The completion and acceptance of the ground station marked progress in the Lao telecommunications satellite project,laying the foundation for the follow-on Laosat-1 TT&C system and equipment installation and debugging.     

基于RFID技术的机场航空物流管理系统

近些年来,我国的航空运输业发展迅速,航空货运在航空运输中所占比重也逐年上升。现阶段我国的机场航空货运涉及众多环节和部门,其主要由收运柜台、货物称重、出港文件准备、货场操作、出港航班、进港文件接收处理、进港航班、运单交付、货物交付等业务组成,每一项业务又同机     

民航事故调查信息平台框架设计

本文探讨了航空器事故调查信息平台的应用需求，设计了民航事故调查信息平台的总体框架。平台采用B／s系统开发模式，包括调查员管理、事故调查过程管理、事故和事故征候案例分析和事故调查信息资料共享管理等功能子系统。同时，针对平台的系统安全问题，设计构建基于网络安全设施和信息安全体系的平台整体安全体系结构，用于实现平台的安全性和可用性。平台的应用将为事故、事故征候和其他不安全事件的调查提供有效的分析工具，规范事故调查信息管理，辅助事故调查工作，提高我国民航事故调查信息化水平。     

通过损失系数实验值确定堵塞系数的方法

本文在分析现有设计体系模型的基础上，提出了一个工程模型，试图把两者关联起来，通过损失系数的实验值确定堵塞系数的值。     

非结构混合网格自适应并行技术

计算流体力学（CFD）模拟实际工程问题所采用的网格规模可达千万量级，并行技术是减少计算时间的有效方法。耦合流场信息的网格自适应技术能有效动态优化计算网格，被NASA视为一项亟待发展的CFD关键技术。混合网格自适应系统包含网格分布优化、表面网格投影和空间网格匹配等关键技术。针对以上3项关键技术分别建立了高效的并行算法。首先，提出了"先唯一后同一"的两步法策略实现了网格单元分布优化过程的并行相容性；其次，基于局部曲面拟合思想，实现了曲面重构和新增物理网格点投影的完全并行；再次，提出了空间网格匹配技术的半并行算法，快速解决了网格单元交错问题。为了提高后续流场计算的并行效率，发展了基于并行重分区-网格数据迁移方法的动态负载平衡技术，并采用圆柱激波流场自适应模拟对动态负载平衡技术进行初步验证。最后，采用三角翼自适应加密测试了自适应系统的并行效率。结果表明，建立的混合网格自适应系统并行效率较高，且相比流场求解耗费总时间的比例低于1%。     

基于CR理论的大柔性机翼几何非线性结构建模

大柔性机翼在气动载荷的作用下,将产生显著的弹性变形,常规线弹性理论的小变形假设不再成立,需要采用能够考虑几何非线性效应的结构模型进行求解。基于CR(Co-Rotational)共旋转有限元理论,把几何非线性大变形分解为刚体的旋转和平移及局部坐标系下的弹性变形,建立了适用于大柔性机翼几何非线性变形描述的结构模型。以大柔性悬臂梁为例,采用载荷增量法,研究了集中弯矩作用下的非线性变形特征,对静力学方法进行了验证,并讨论了耦合加载几何非线性变形特征;以类"太阳神"太阳能布局无人机(UAV)为例,研究了其几何非线性大变形特性。     

雷达散射截面计算方法综述

对目标雷达散射截面（RCS）计算方法进行了总结，指出了各种方法的适用范围。以具有复杂外形特征的军用战斗机为例，用物理光学法进行了全机的RCS计算，验证了该方法在飞机设计中的实用性。