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A Gradient Accuracy Study for the Adjoin&Based Navier-Stokes Design Method
Gradient Accuracy Study Adjoin&Based Navier-Stokes Design Method
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2015/7/2
A continuous adjoint method for Aerodynamic Shape Optimization (ASO) using the compressible Reynolds-Averaged Navier-Stokes (RANS) equa-tions and the Baldwin-Lomax turbulence model was implemented and...
Time-accurate simulation of helicopter rotor flows including aeroelastic effects
Time-accurate simulation helicopter rotor flows including aeroelastic effects
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2015/7/1
The following work presents recent developments in the simulation of helicopter rotor flows in the hover and forward flight regimes. The simulations are carried out by solving the full time-accurate c...
Aerodynamic Shape Optimization of Wing and Wing- B CI dy Configurations Using Control Theory
Aerodynamic Shape Optimization Wing- B CI Configurations Control Theory
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2015/7/1
This paper describes the implementation of op-timization techniques based on control theory for wing and wing-body design. In previous stud-ies [18, 19,221 it wasshown that control theory could be use...
A New High Resolution Scheme for Compressible Viscous Flows with Shocks
Resolution Scheme Compressible Viscous Flows Shocks
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2015/7/1
A new flux splitting and limiting technique which yields one-point stationary shock capturing is pre-sented. The technique is applied to the full Navier-Stokes and Reynolds Averaged Navier-Stokes equa...
A theoretical method was developed, and experimentally validated, to control the static shape of flexible struc tures by employing internal translational actuators. A finite element model of the struc...
A demonstration of Alfvbn waves Part 1. Generation of standing waves By ANTONY JAMESON
Alfvbn waves Generation standing waves ANTONY JAMESON
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2015/7/1
In this paper the equations for Alfvh waves are examined and conditions necessary for the occurrence of resonance are determined. An experiment using liquid sodium inside a torus is described. Waves w...
Aero dynamic Shap e Optimization fo r Aircraft Design。
A collective is a group of self-motivated agents that maximize system performance
through the pursuit of local objectives. This paper deals with two aspects of collective
design: the application o...
DISTRIBUTED MULTIDISCIPLINARY DESIGN AND COLLABORATIVE OPTIMIZATION
COLLABORATIVE OPTIMIZATION MULTIDISCIPLINARY DESIGN
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2015/6/18
These notes describe some recent ideas for distributed design and their application to
large-scale aerospace systems. In this type of multidisciplinary optimization, design
tasks are decomposed in...
This note describes the use of evolutionary design methods in aeronautics, highlighting
the types of problems for which these methods are best suited and detailing some
algorithms that have been u...
压气机S型过渡段的多目标优化设计
S型过渡段 多目标优化 设计规律
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2015/12/22
压气机过渡段不仅要保证小的流动损失，还要提供均匀的流动分布，为下游压气机提供有利的进气条件；利用遗传算法，选择总压损失系数和过渡段出口的均匀度为目标，确定半程落差比和控制面积比为变量，对S型过渡段进行了多目标的气动数值最优化研究，通过分析结果得出了设计规律并进行讨论，证明了其适用性。
运用粒子群优化算法的平流层飞艇总体设计
平流层飞艇 总体设计 粒子群优化算法
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2016/6/3
平流层飞艇总重最小化能一定程度上反映总费用最低的设计目标，满足有效载荷功率需求是飞艇总体设计的出发点和落脚点。在飞艇参数建模中引入太阳电池曲面铺装模型以及昼夜能源闭环模型；以整艇重量最小为设计目标，以昼夜能源供需平衡、浮重平衡、推阻平衡三大平衡问题为约束条件，运用粒子群优化算法对飞艇的外形尺寸参数进行优化设计；分析了有效载荷功率需求和功率密度对于飞艇总体设计结果的敏感性。分析结果表明：飞艇总重随有...
经纬网络充气机翼构形特征与气动性能分析
充气机翼 构形特征 气动性能 流动机理
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2016/6/3
将充气机翼应用于临近空间太阳能飞行器是具有创新性的设计概念。针对充气机翼构形特征和气动分析的相关问题，对构形特征进行分析和设计，并建立经纬网络充气机翼的模型；进一步运用数值方法，通过与标准翼型对比，分析二维充气机翼、三维经纬网络充气机翼的气动性能。数值分析结果表明，在设计的雷诺数条件下，充气机翼的气动性能相比于标准翼型有所降低。在此基础上，结合对流场结构和流动机理的研究，分析出导致充气机翼总阻力系...
处理机匣情形下的轴流压气机转子失速
处理机匣 斜槽 失速
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2015/12/8
为了解在处理机匣作用下的压气机转子失速点流动,采用非定常模拟方法对跨声轴流压气机转子在带气室斜槽处理机匣情形下的流动进行了模拟研究,获得了高、低转速下的转子特性,并针对近失速点流场进行了分析.结果表明,在处理机匣的作用下,转子失速的主要产生原因与实壁情形不同.在失速点,处理机匣有效地抑制了叶尖泄漏流的负面作用,但由于不能更多地吸纳叶尖的低能流体,使得叶片吸力面附面层中向叶尖迁移的低流向动量流体堆积...