925 resultados para Hypersonic planes


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在高超声速(M=6)流动中,实验研究了侧向喷流的干扰特性,并探讨了喷流压力、攻角、迎风侧及背风侧喷流对侧向喷流干扰特性的影响.结果表明,在高超声速流动中,随喷流压力增大,喷流弓形激波与来流弓形激波相交,喷流前的高压区增大,而喷流后的低压区几乎不受影响,喷流的控制效果加强.与迎风侧喷流相比,背风侧喷流控制效果更好,这一趋势随攻角的增大更加明显.

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373 p. : il., gráf., fot., tablas

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简述了蜡纸存贮法在高超声速脉冲风洞锥—舵干扰流场显示中的应用,给出了迎风面内舵周围干扰区立体和平面展开两种油流谱图,揭示了其三维干扰流动的特征。

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在JF-8脉冲风洞中,来流马赫数Ma=8.0,来流单位长度雷诺数Re/L=1.47×107和2.52×107(1/m)两种试验条件下,对高超声速飞行器1/20缩尺模型进行了表面气动热的测量.模型攻角α=0°,10°,15°,20°,25°和30°.试验给出机身对称面、翼前缘、立尾前缘等处的热流率分布.机头部分最大热流率与由Fay-Riddell公式计算的驻点热流Q0率接近,翼前缘最大热流率在全机身中最大,约为Q0的2倍,因此翼前缘的热环境是最严酷的.

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Espanol: Este trabajo tiene como objetivo la recopilación de la información existente sobre las especies presentes en nuestro territorio. Para ello, se elaboraron fichas que contienen las referencias argentinas y de aquellas revisiones de autores extranjeros que involucran taxas de nuestro país. Como principales fuentes de información se consultaron Ringuelet et al. (1967), CLOFFSCA (2003), López et al. (2003; 2006), Liotta (2006) y las bases de datos on-line de W. N. Eschmeyer y Fish Base. Esta es una publicación abierta, por lo que requerirá de actualización permanente, para lo cual sería necesario se sume a nuestra tarea la buena voluntad y colaboración de la comunidad ictiológica. Esperamos con este aporte colaborar en la construcción de una base de datos de los peces continentales de la Argentina. La concreción de esta herramienta dará soporte a los planes generados desde los diferentes sectores involucrados en el tema, además de fomentar la difusión de la disciplina y la reafirmación de los derechos soberanos sobre nuestros recursos naturales. English: The goal of this work is to compile the existing information about the species present in our country. This has been done by means of datasheets that list both local references and reviews by foreign authors that include Argentine taxa. The main information sources consulted were Ringuelet et al. (1967), CLOFFSCA (2003), López et al. (2003; 2006), Liotta (2006) and the online databases of W. N. Eschmeyer and Fish Base. This is an open-ended publication. As such, it will require permanent updating, which will depend on the good will and collaboration of the ichthyological community. With this contribution, we hope to help to build a database of the freshwater fish of Argentina. The completion of this project will provide support to diverse plans emanating from different sectors, as well as promote the diffusion of this field of research and reaffirm Argentina’s sovereign rights over our natural resources. (Texto en Espanol Y English. PDF tiene nueve paginas.)

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Espanol: Este trabajo tiene como objetivo la recopilación de la información existente sobre las especies presentes en nuestro territorio. Para ello, se elaboraron fichas que contienen las referencias argentinas y de aquellas revisiones de autores extranjeros que involucran taxas de nuestro país. Como principales fuentes de información se consultaron Ringuelet et al. (1967), CLOFFSCA (2003), López et al. (2003; 2006), Liotta (2006) y las bases de datos on-line de W. N. Eschmeyer y Fish Base. Esta es una publicación abierta, por lo que requerirá de actualización permanente, para lo cual sería necesario se sume a nuestra tarea la buena voluntad y colaboración de la comunidad ictiológica. Esperamos con este aporte colaborar en la construcción de una base de datos de los peces continentales de la Argentina. La concreción de esta herramienta dará soporte a los planes generados desde los diferentes sectores involucrados en el tema, además de fomentar la difusión de la disciplina y la reafirmación de los derechos soberanos sobre nuestros recursos naturales. English: The goal of this work is to compile the existing information about the species present in our country. This has been done by means of datasheets that list both local references and reviews by foreign authors that include Argentine taxa. The main information sources consulted were Ringuelet et al. (1967), CLOFFSCA (2003), López et al. (2003; 2006), Liotta (2006) and the online databases of W. N. Eschmeyer and Fish Base. This is an open-ended publication. As such, it will require permanent updating, which will depend on the good will and collaboration of the ichthyological community. With this contribution, we hope to help to build a database of the freshwater fish of Argentina. The completion of this project will provide support to diverse plans emanating from different sectors, as well as promote the diffusion of this field of research and reaffirm Argentina’s sovereign rights over our natural resources. (Texto en English y Espanol. PDF tiene ocho paginas.)

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针对高超声速飞行器前体预压缩性所需求的气动构型,开展了具有一级压缩效果的压缩面边界层的流动稳定性分析.采用有限体积法数值求解NS方程组得到基本流场,应用当地局部平行流假设和线性稳定性理论求解了扰动波参数的特征值问题.分析了来流马赫数M∞=6情况下二维扰动波的演化规律,并进一步关联扰动的空间放大率,结合EN方法进行了转捩预测.

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在风洞实验中,为了保证实验结果的可靠性,首先需要了解流场的品质.笔者自行设计研制了用于高超声速推进风洞流场测量的带有水冷装置的可移动式扫描总压耙.对于出口截面为300mm×187mm的风洞喷管,通过计算机程序控制,可在3s时间内实现全截面间歇式或连续式扫描,最大移动速度可达250mm/s,而且定位准确.通过扫描结果,分析了流场压力均匀性、稳定性以及实验结果的可重复性,同时还给出了风洞喷管出口截面的总压与马赫数等值线图.从而为超燃冲压模型发动机实验提供参考数据.

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以绕楔高超声速流场为基础,用流线追踪法生成了一种高超声速飞行器气动概念构形、初步探索了高超声速飞行器机身/推进系统一体化气动构形设计方法,开展了高超声速测压实验,结果表明:该类构形飞行器在高超声速飞行时,可以产生较高的升阻比,前体的预压缩效果明显,是以吸气式冲压发动机动力的有效途的飞行器构形。

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用数值模拟的方法研究了高超声速飞行器前体不同型面与进气性能的关系,分析了二级压缩构型在不同压缩角组合和来流攻角下的流场品质和产生的压缩效果.研究结果表明,对于高超声速飞行器,采用多级压缩的前体构型可以得到较好的预压缩效果和优良的流场品质;同时,攻角和不同的压缩角组合会对压缩性能产生影响.因此,采用多级压缩的前体构型、优化各级压缩角的组合是决定飞行器前体预压缩性能的重要因素,同时也是开展前体/发动机一体化设计的关键.

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Two different type scramjet models with side-wall compression and top-wall compression inlets have been tested in HPTF (Hypersonic Propulsion Test Facility) under the experimental conditions of Mach number 5.8, total temperature 1700K, total pressure 4.5MPa and mass flow rate 3.5kg/s. The liquid kerosene was used as main fuel for the scramjets. In order to get fast ignition in the combustor, a small amount of hydrogen was used as a pilot. A strut with alternative tail was employed for increasing the compression ratio and for mixing enhancement in the side-wall compression case. Recessed cavities were used as a flameholder for combustion stability. The combustion efficiency was estimated by one dimensional theory. The uniformity of the facility nozzle flow was verified by a scanning pitot rake. The experimental results showed that the kerosene fuel was successfully ignited and stable combustion was achieved for both scramjet models. However the thrusts were still less than the model drags due to the low combustion efficiencies.

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The hypersonic waverider forebody is designed in this paper. For the present waverider, the undersurface is carved out as a stream surface of a hypersonic inviscid flow field around wedge-elliptic cone, and the upper surface is assumed to be a freestream surface. A finite-volume code is used to generate the three-dimensional flow field. The leading edge is determined by satisfying the condition that the lip is situated at the intersection line of shocks.

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本文集共收录了作者24篇期刊论文和研究报告。其中,1943~1955年期间发表的14篇论文内容涉及直管中的可压缩流动、有限振幅柱面和球面波的传播、可压缩流体二维无旋亚声速、超声速混合型流动和上临界马赫数、光滑跨声速绕流及其稳定性、斜激波从平板边界层的反射、中等雷诺数下绕平板的流动等。1956~1957年期间发表的5篇论文:绕平板和楔的高超声速流动、普朗特数和解离对高超声速流动的影响以及增补的5篇文章是作者在高超声速流动领域的研究成果以及他在回国后的学术报告和发表的文章,涉及现代空气动力学的发展方向、发射卫星和返地回收的科学和技术问题,体现了他在参与“两弹一星”技术领导工作中的学术思想。
目录
1 On the force and moment acting on a body in shear flow(物体在剪切流中所受的力和力矩1943年)
2 The flow of a compressible viscous fluid through a straight pipe.(可压缩黏性流体在直管中的流动1943年)
3 Two dimensional irrotational mixed subsonic and supersonic flow of a compressible fluid and the upper critical Mach number(可压缩流体二维无旋亚声速和超声速混合型流动及上临界马赫数1946年)
4 On the stability of transonic flows(论跨声速流的稳定性1947年)
5 The propagation of a spherical or a cylindrical wave of finite amplitude and the production of shock waves(有限振幅球面波或柱面波的传播及激波的产生1947年)
6 Two-dimensional irrotational transonic flows of a compressible fluid(可压缩流体二维无旋跨声速流动1948年)
7 On the hodograph method(关于速度图方法1949年)
8 Two-dimensional transonic flow past airfoils(绕翼型的二维跨声速流1951年)
9 On the stability of two-dimensional smooth transonic flows(论二元光滑跨声速流的稳定性1951年)
10 On the flow of an incompressible viscous fluid past a flat plate at moderate Reynolds numbers(中等雷诺数下不可压缩黏性流体绕平板的流动1953年)
11 Reflection of a weak shock wave from a boundary layer along a flat plate.I:Interaction of weak shock waves with laminar and turbulent boundary lavers analyzed by momentum-integral method(弱激波从沿平板的边界层的反射Ⅰ:用动量积分方法分析弱激波与层流和湍流边界层的相互作用1953年)
12 Reflection of weak shock wave from a boundary layer along a flat plate.Ⅱ:Interaction of oblique shock wave with a laminar boundary layer analyzed by differential-equation method(弱激波从沿平板的边界层的反射Ⅱ:用微分方程方法分析斜激波与层流边界层的相互作用1953年)
13 Plane subsonic and transonic potential flows(平面亚、跨音速势流1954年)
14 A similarity rule for the interaction between a conical field and a plane shock(锥型流和激波相互作用的相似律1955年)
15 Viscous flow along a flat plate moving at high supersonic speeds(沿高超声速运动平板的黏性流动【Ⅰ】1956年)
16 Viscous flow along a flat plate moving at high supersonic speeds(沿高超声速运动平板的黏性流动【Ⅱ】1956年)
17 The effects of Prandtl number on high-speed viscous flows over a flat plate(Prandtl数对绕平板高速黏性流的影响1956年)
18 Compressible viscous flow past a wedge moving at hypersonic speeds(楔的高超声速可压缩黏性绕流1956年)
19 Dissociation effects in hypersonic viscous flows(高超声速黏性流动中的离解效应1957年)
20 现代空气动力学的问题(1957年)
2l 在关于苏联发射成功第一颗人造卫星座谈会上的发言记录(1957年)
22 高超速钝体湍流传热问题(1963年)
23 宇宙飞船的回地问题(1965年)
24 激波的介绍
郭永怀生平
郭永怀传

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本文集收入了著名力学家、应用数学家、中国科学院院士谈镐生先生在流体力学、稀薄气体动力学和应用数学研究领域的论文和研究报告26篇,谈镐生先生倡导和支持力学基础研究的有关文章和论述21篇,谈先生的学术活动和生活图片多幅,以及谈镐生先生生平,最后附有谈先生生平年表。

 

 

目录

科技论文
Theaerodynamics of supersonic biplanes
Strength of reflected shock in Mach reflection
On laminar boundary layer over arotating blade
A unique law for ideal incompressible flow with preserved pattern off initeseparation
On motion of submerged cylinder
On source and vortex off luctuating strength U~aveling beneath a free surface
Wave sproduced by a pulsating source U~ave lingbeneath a free surface
On optimum nose Curves form issiles in the superaerodynamic regime
On optimum nose Curves for superaerodynamic missiles
On a special bolzavariational problem and the minimization of superaerodynamic
Hypersonic nose drag
Nose drag in free-molecule flow and its minimization
Final mdash;stagedecay of a single line vortex
Final stage decay of grid—produced turbulence

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El marco jurídico aplicable a las Instituciones de previsión propias del País vasco,es mucho más competitivo que el modelo estatal más privilegiado por el legislador,los Planes y fondos de pensiones.