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The linearity of calibration curve provided by SEKI was similar to that offered by nonbias hydrodynamic injection (HDI) but significantly better than that obtained by EKI.


Based on hydrodynamic equations, an equation formulizing the parametric instability was derived.


Based on the variational constraint approach, the variational form of Reynolds equation in hydrodynamic lubrication is revised continuously to satisfy certain constraints in the cavitation zone of oil film field.


Method of internal 3D flow field numerical simulation for hydrodynamic torque converter


The performance parameters of the hydrodynamic torque converter were predicted.

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A discrete element method (DEM)computational fluid dynamics (CFD) twoway coupling method was employed to simulate the hydrodynamics in a twodimensional spouted bed with draft plates.


We examine the propagation of forced planar harmonic pressure waves in a resting equilibrious infinite homogeneous medium far from the wave source (in the far field) on the basis of the linearized equations of radiative hydrodynamics.


Hydrodynamics in weak force fields onset of steady thermocapillary convection in a spherical fluid layer under zerog conditions


Numerical method for solving unsteady axisymmetric problems of the hydrodynamics of an ideal liquid with free surfaces


The calculation of the diffusive flux of matter to the surface of a body in a fluid stream is one of the basic problems of physicochemical hydrodynamics and finds application in chemical macrokinetics [1].

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An explicit expression is obtained for the hydrodynamic force when the velocity of the external flow depends linearly on the coordinates.


The parameters which determine the particle drag coefficient and its relation with the hydrodynamic force component normal to the wall were obtained.


An analytical expression is obtained for the hydrodynamic force acting on the particle.


The hydrodynamic force of the spherical squeeze film decreases with increasing the initial slip length and decreasing the critical shear rate.


The effect of initial slip length on the hydrodynamic force seems less than that of the critical shear rate.

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The torque produced by hydrodynamic forces in a vortex favors fish overturn and loss of balance.


Hydrodynamic forces with sinusoidal vibrations of a disk


The sign of the hydrodynamic forces depends on the particular law of growth of the vapor bubble.


Moreover, the results of the present paper can be used to evaluate the hydrodynamic forces acting on underwater wings or propeller blades during intersection with a free surface.


Hydrodynamic forces produced when blunt bodies strike the surface of a compressible fluid

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 The wake model, suggested by T. Y. Wu in 1962, is linearized and applied to treat the twodimensional supereavitating or partially cavitating hydrofoil of the arbitrary camberline. The rear end of the cavity in this model, which may also be called as" open type model" in the linearized theory, is regarded as nonclosed. At the downstream of the cavity, there is a wake region stretched to the infinity. For a part of the free streamline near the hydrofoil, the pressure is assumed to be constant and equal to the... The wake model, suggested by T. Y. Wu in 1962, is linearized and applied to treat the twodimensional supereavitating or partially cavitating hydrofoil of the arbitrary camberline. The rear end of the cavity in this model, which may also be called as" open type model" in the linearized theory, is regarded as nonclosed. At the downstream of the cavity, there is a wake region stretched to the infinity. For a part of the free streamline near the hydrofoil, the pressure is assumed to be constant and equal to the saturated vapor pressure. For the free streamline downward of the former part, the pressure gradually increases and finally reaches the value of that of the infinitely forward undisturbed stream. There exists the wake region and thus the stagnation (point (singular points) is avoided at the rear end of the cavity. The application of this model provides a smooth continuous transition of the solution from the fully eaviteted flow to fully wetted flow. The results, obtained in this paper, may be used to estimate the hydrodynamic forces as a first approximation in the transitional state, for it is commonly known that the result, obtained with the closed model, is invalid, as the cavity length approaehing to that of the chord. Besides, there are only two unkown constants in the author's solution, thus the calculation can be simplified.  在本文中把吴耀祖(T.Y.Wu)在1962年提出的尾流模型加以线性化,并用来处理任意拱弧形状的二元超空泡初局部空泡水翼。这个模型在线性化理论中亦可称为开式模型,空泡末端是作为不封闭的。而在空泡的下游有一尾流区伸展到无穷远后。自由流线靠近水翼的一部分上,压力假定为常数,等于鲍和蒸汽压力。在前述部分下游自由流线上,压力逐渐增加,到无穷远后恢复到来流压力。由于空泡末端后存在着尾流区,这样则末端上避免了驻点(即奇点)。应用这个模型可使解从超空泡流连续过渡到无空泡流。本文所得的结果可以作为一级近似来估计过渡状态的水动力,因为封闭式模型的结果在空泡长度趋向弦长时是失效的。此外,本文的解中只出现二个待定常数,因此计算可以简化。  In this paper, the manoeuvrability of catamaran ship is qualitatively discussed by using theoreticalexperimental method. The determination of added mass was made for twodimensional doubleplate with the application of electrical analogy, and resistance tests for which were carried out in wind tunnel. Based upon these test results and circularseparative theory of lowaspectratio wings, the expressions of hydrodyhamic characteristics of catamaran ship have been derived. After calculation of worked examples,... In this paper, the manoeuvrability of catamaran ship is qualitatively discussed by using theoreticalexperimental method. The determination of added mass was made for twodimensional doubleplate with the application of electrical analogy, and resistance tests for which were carried out in wind tunnel. Based upon these test results and circularseparative theory of lowaspectratio wings, the expressions of hydrodyhamic characteristics of catamaran ship have been derived. After calculation of worked examples, it may be concluded as follows: 1. The advance decreases with the decreasing in hull separation, whereas the course stability grows worse. The range of application of this conclusion covers the ease of single hull ship having a beam corresponding to twice that of half hull of catamaran ship, in this case, the single hull ship is taken as zero hull separation of catamaran ship. 2. The effect of hull separation upon turning quality of catamaran ship is not significant. However, the turning quality of a single hull ship having twice the beam as that of half hull of catamaran ship is much better than that of eorrespondiug catamaran ship.  本文用理论一试验方法定性地讨论了双体船的操纵性。对二元双板用水电比拟方法断了附连质量的测定和在风洞中进行了阻力试验。应用了这些试验结果以及环流—分离短翼理论导出了双体船水动力特性的表示式。通过实例计算后作出如下经论:1.双体船片体间距愈小,航向稳定性愈差,进距愈小。这个结论的适用范围包括了宽度为双体船片体两倍的单体船情况,此时单体船看作是片体间距为零的双体船。2.片体间距对双体船回转性的影响极不显著,但宽度为片体两倍的单体船之回转性远比相应的双体船好。  When a glider moves in a seaway, it yields oscillations. M. D. Haskind discussed the nonsteady motions of small curved planing plate by using the theory of complex functions, and obtained the general expression of hydrodynamic forces. In this paper, the pressure distribution of hydrodynamic forces on the planing plate was obtained with another method. First, in solving a pulsating pressure point δ(x)cos(wt ε) on the free surface, the expressions of its normal induction velocity v(x, t; U, ω, ε) for two cases... When a glider moves in a seaway, it yields oscillations. M. D. Haskind discussed the nonsteady motions of small curved planing plate by using the theory of complex functions, and obtained the general expression of hydrodynamic forces. In this paper, the pressure distribution of hydrodynamic forces on the planing plate was obtained with another method. First, in solving a pulsating pressure point δ(x)cos(wt ε) on the free surface, the expressions of its normal induction velocity v(x, t; U, ω, ε) for two cases of β<1/4 and β>1/4 were obtained. Then the planing plate was replaced by an unknown pressure distribution and obtained its induction velocities. By equating the normal induction velocity on the planing plate to its normal velocity of pitching and heaving motions, obtained the integral equations of the unknown pressure distribution. To derive the formulas of heaving force and pitching moment, the integral equations were solved by turned into a system of infinite linear algebraic equations, also the solubility of this system of infinite equations was discussed. Finally, a numerical example for the pressure distribution on the planing plate was calculated by taking its first sixterms of Fourier expansion series.  滑行艇在海浪中运动时,会产生搖摆。哈斯金德用复变函数理論讨論了微弯滑行板的非定常运动,获得了計算水动力的一般公式。本文用另一种方法考虑这个問題,并計算了滑行板面上水动力的压力分佈。文中首先研究了液面上脉动点压δ(x)cos(ωt+ε)的解,求出了它的法向誘导速度v(x,t;U,ω,ε),分β<14和β>1/4两种情形得到其表达式,然后以一未知的压力分佈代替滑行板,求出該分佈压力系的誘导速度。令板面处的法向誘导速度与滑行板由纵搖和升沉运动所产生的法向速度相等,便得到求解未知压力分佈的积分方程式。文中討論了用福里哀级数表示未知压力分佈的函数,并把积分方程的求解問題变成一无穷线性代数方程组的求解問題,又进一步論述了該代数方程組的可解性条件。文中求出了升沉力和纵搖力矩的表达公式。最后,取压力分佈函数的前六項福里哀級数項,对一个具体数值例子进行了計算,求得了滑行板面上的压力分佈。   << 更多相关文摘 
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