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1993 Vol. 25, No. 6

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THE NEW METHOD OF SOLVING VELOCITY CORRELATION FUNCTIONS AND ITS APPLICATION TO-THE PLANE TURBULENT WAKE
In this paper, the results of plane turbulent wake given by Zhou Peiyuan are considered as the first order approximation and put, into the equations of turbulent fluctuation. The equations are solved numerically within the range of micro-scale by means of spectrum method. The double, triple and quadruple fluctuating velocity correlations are obtobred by computation. They are in a good agreement with experimental results.
1993, 25(6): 643-651. doi: 10.6052/0459-1879-1993-6-1995-689
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NUMERICAL STUDY OF SHOCK WAVE AND TURBULENT BOUNDARY LAYER INTERACTION INDUCED BY FLAT-FACED BLUNT FIN
The shock wave and turbulent boundary layer interaction induced by flat-faced blunt fin mounted on a flat plate is numerically studied. The calculation results display "A" shock wave structure generated by the impingement of separated shock with the bow shock. Some new phenomena are discovered in this flow through the simulation, such as the bifurcation and mergence of vortices in the separation region ahead of blunt fin, the existence of secondary separation and secondary vortex, multiple vortices structur...
1993, 25(6): 651-657. doi: 10.6052/0459-1879-1993-6-1995-690
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STABILIZING EFFECTS OF MAGNETIC FIELD ON THE THERMAL CONVECTION FLOW IN A CONDUCTING FLUID
MHD equations of the thermal convection flow in a conducting fluid is derived and a numerical simulation is presented for the thermal convection flow in the semiconductor crystal growth under a vertical magnetic field. Computational results show that oscillations and multiccll flow structure with separation at wall are effectively suppressed by the magnetic field with an appropriate strength, and that the stabilizing effects of magnetic field on the thermal convection flow increase with Hartmann number incr...
1993, 25(6): 658-664. doi: 10.6052/0459-1879-1993-6-1995-691
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METHOD OF HYPERSINGULAR INTEGRAL EQUATIONS IN THREE-DIMENSIONAL FRACTURE MECHANICS
Using the concepts and method of finite-part integrals, the hypersingular integral equations of a plane crack loaded by arbitrary loads is proved exactly. The behaviour of the unknown solution are analysed theoretically and its indexes are then obtained. Based on these results, the singular stresses near the smooth point of the crack front are exactly derived by use of the dominant analyses. Then the stress intensity factors are expressed in terms of the displacement discontinuities of the crack surface. Fi...
1993, 25(6): 665-675. doi: 10.6052/0459-1879-1993-6-1995-692
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STATIONARY SOLUTIONS OF STOCHASTICALLY EXCITED DISSIPATIVE HAMILTONIAN SYSTEMS
The exact stationary solution for a general class of stochastically excited dissipative Hamiltonian systems is first obtained, based on which an equivalent nonlinear system method is then developed for similar but more general class of systems.
1993, 25(6): 676-684. doi: 10.6052/0459-1879-1993-6-1995-693
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THE GENERAL THEORY OF VISCOELASTICITY UNDER NONCONSTANT TEMPERATURE STATES
本文提出了变温松弛曲线的概念,建立了由材料的一组恒温松弛曲线确定材料沿任一温度历史的变温松弛曲线的方法;提出了终态温度等效松弛曲线的概念,推导出了变温下粘弹性材料本构方程的一般形式。文中证明了现有的热流变简单材料理论是本文理论的特例,并揭示了热流变简单材料理论的物理内涵。
1993, 25(6): 685-696. doi: 10.6052/0459-1879-1993-6-1995-694
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DYNAMIC BEHAVIOUR OF LARGE DEFLECTION OF RECTANGULAR THIN-PLATE WITH INITIAL CURVATURE
In this paper the equations of motion for the large deflection problem of a visco-elastic rectangular thin plate with initial curvature are expressed in terms of three displacements at the midplane. For a simply supported plate subjected to transverse load, the dynamic response of the plate under periodic load is studied, and the criterion of arising subharmonic bifurcation and the horseshoe (or chaotic) state is given by the bifurcation theory and the Melnikov's method.
1993, 25(6): 697-708. doi: 10.6052/0459-1879-1993-6-1995-695
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A LASER INTERFEROMETRIC MEASUREMENT OF THE TEMPERATURE DISTRIBUTION IN CONVECTIVE HEAT TRANSFER BOUNDARY LAYERS
本文介绍利用双镜干涉仪测量对流传热边界层中二维温度分布的方法。当冷空气流经热板模型时,附面层内的干涉条纹发生弯曲。根据条纹弯曲偏移量,由折射率与温度的关系,画出空气温度的二维分布图。整个过程由光学方法及微计算机全盘处理,是一种无接触测量方法。
1993, 25(6): 709-715. doi: 10.6052/0459-1879-1993-6-1995-696
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EXPERIMENTAL INVESTIGATION OF NATURAL CONVECTION NEAR A SOLID LIQUID INTERFACE
本文在水平Bridgman定向凝固装置中,对超薄试样中固液界面前沿的自然对流进行了实验研究。发现在厚度仅为200μm—700μm的试样中,由于水平温度梯度的存在,凝固界面附近仍然存在着不可忽视的自然对流,并系统研究了各种不同因素对界面前沿热对流的影响规律,为界而过程的微观分析和凝固理论的研究提供了丰富的信息,为采用该装置进行透明有机物模拟研究提供了设计依据。
1993, 25(6): 716-720. doi: 10.6052/0459-1879-1993-6-1995-697
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NUMERICAL SIMULATION OF CONVECTIVE BIFURCATION FOR A SQUARE POROUS CAVITY
The convective bifurcation of fluid through porous media in a square cavity heated from below is simulated numerically by the cubic spline method. This paper gives three critical points and presents the preliminary results for conditional stability.
1993, 25(6): 721-725. doi: 10.6052/0459-1879-1993-6-1995-698
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DYNAMIC STRESSES AND DYNAMIC STRESS-FOCUSING EFFECT IN A SOLID SPHERE UNDER THERMAL SHOCK
This paper presents a simple analytical method solving the dynamic stress response in a solid sphere under thermal shock. From analytical expressions and calculating results we can observe that there is concentration of the dynamic stress at the center of a solid sphere and periodical oscillation due to the continual reflection of stress wave at the external boundary of the solid sphere.
1993, 25(6): 726-731. doi: 10.6052/0459-1879-1993-6-1995-699
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INVESTIGATION ON THE ASYMPTOTIC SOLUTION FOR THE MODE III MOVING CRACK-TIP FIELD
Adopting an elastic-viscoplastic model, the asymptotic problem of mode Ⅲ moving crack-tip filld is investigated. This paper gives the forms of all asymptotic solutions through the analysis of the dynamic crack propagation and quasi-static crack growith problems, and proves that the quasi-statically growing crack solution is the special case of dynamic propagating solution.
1993, 25(6): 732-737. doi: 10.6052/0459-1879-1993-6-1995-700
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ANALYSIS ON PFEIFFER'S METHOD STUDYING SLOSH OF SPINNING LIQUID
An analytical technique on the Pfeiffer's method is suggested in the present paper to study the spinning liquid slosh problems. This technique extends the Pfeiffer's method to treat the spinning liquid slosh in various gravitational conditions.
1993, 25(6): 738-743. doi: 10.6052/0459-1879-1993-6-1995-701
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COMMENTS ON TWO PAPERS CONCERNING THE UNIVERSAL PHYSICAL EQUATION OF TURBULENCE AND ITS CANONICAL FORM
, Jiachun Li
In this paper, the theory proposed in two papers of Gao Ge's entitled "The universal physical equation of turbulence" and "The derivation of the universal physical equation of turbulence and relevant discussion" is analysed systematically, particular attention being paid to the part for incompressible turbulence, a representative of Gao Ge's theory. It is shown that the ensemble for the second average in those papers does not exist, both the turbulence-force hypothesis and effective-turbulence-force hypothe...
1993, 25(6): 744-758. doi: 10.6052/0459-1879-1993-6-1995-702
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1993, 25(6): 759-762. doi: 10.6052/0459-1879-1993-6-1995-703
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