From the requirement of dynamic modeling and computer simulation of ship propulsion plant, the importance of building mathematical model of fluid coupling for research on the dynamic characteristics of ship propulsion plant is stated, and for using experimental curve of the fluid coupling-in the form of the input characteristic-as source data for quasi steady model.

Because of its fast and flexible controllability, the voltage source converter (VSC) based high voltage direct current (VSC-HVDC) will be widely applied in power systems, so it is of practical significance to study the dynamic performance of VSC-HVDC in complicated power grids. The quasi steady state response of flexible HVDC system can be simulated in power system simulation software PSS/E.

柔性直流输电系统(voltage sourced converters high voltage direct current,VSC-HVDC)因其快速灵活的可控性在电力工业中将有越来越广泛的应用,研究其在复杂电力网络中的动态性能具有工程实际意义,应用电力系统仿真软件PSS/E可模拟柔性直流输电的准稳态响应。

The quasi steady flow method is applied widely for measuring the instantaneous flowrate, but its application is restricted by the similarity criterion Strouhal number which should be very small.

The mathematical equations of one dimensional ,quasi steady,chemical equilibrium are established for ram accelerator. The equations are solved by Gauss reiterative method. The performance curves of ram accelerator are calculated,and the characteristics of ram accelerator is analyzed.

The similarity criterion--Strouhal number Sr was derived from the substantive derivative in this paper. The Sr number is a limiting condition for applying of the quasi steady flow method to the measurement of the instantaneous flowrate.

For the first time, the influence of base plate and projecting angle on the formation of the jet has been considered By utilizing the one dimension quasi steady flow theory,the calculation formulas of the mass,moving direction and velocity are deduced for the jet that is formed in the colliding process of flyer plate against base plate under the condition of slant setting.

Inver function transformation has been conducted on the approximation analytical solution describing the quasi steady radial flow dispersion in this paper.

On the basis of the characteristics of inlet process of supercharged four stroke diesel engine, assuming that air flow is one dimensional quasi steady incompresseble flow during charge, the authors present a simplified dimensionless mathematical model for determining the optimum component size matching of the intake system, which brings about an improvement of fuel economy due to the increase of charging coefficient, and which is verified by the experimental results of Model 6160A supercharged four stroke diesel engine.

For the safe construction and operation of high arch dam,the concrete arch dam construction and operation procedure during 30 years in Jinping-1 engineering is simulated by finite element method. The results show the temperature duration,the distribution patterns of quasi steady temperature field and stress field of 300m grade high arch dam. Important reference is provided to designing and construction in the aspect of temperature control and cracking prevention.

We consider a quasi steady laminar axisymmetric flow of Bingham type under the assumption that the yield stress increases at a rate proportional to the internal power dissipation.

The HRG process (also known as the low-angle silicon sheet [LASS] process) has been analysed from the standpoint of a quasi steady-state heat flow analysis, subject to the assumption of a parabolic ribbon cross-section.

The oxidation consisted of an initial transient period in which a composite scale of NiO and Cu oxides formed, and a subsequent quasi steady-state regime during which parabolic growth of NiO determined the overall oxidation rate.

The equations derived can be used for rapid estimation of the time, required to reach a prespecified fraction of quasi steady state plasma level during quasi-uniform multiple dosing.

The Valensi-Carter, Ginstling-Brounshtein, and other quasi steady state models have been extended to include mixed control.

The relation between the basic currents of the low latitudes and the initiation of typhoons is investigated statistically and synoptically by means of recent aerological data. It is shown that about 80% of typhoons developed in the eastern part of the equatorical convergence zone between the equatorial westeries and trade wind of West Pacific Ocean. The equatorial westeries is a large scale and quasi-steady phenomeanon therefore it is probably reasonable to be called "basic current" and typhoons...

The relation between the basic currents of the low latitudes and the initiation of typhoons is investigated statistically and synoptically by means of recent aerological data. It is shown that about 80% of typhoons developed in the eastern part of the equatorical convergence zone between the equatorial westeries and trade wind of West Pacific Ocean. The equatorial westeries is a large scale and quasi-steady phenomeanon therefore it is probably reasonable to be called "basic current" and typhoons are considered as vortices of smaller scale. There is a quite definite relationship between the time, position, frequency of the initiation of typhoons and the position, strength of the basic currents in the low latitudes. There is a quasi-periodical variation of the strength and position of the basic currents with a period longer than one month. This fact may be helpful for the extended forecast the initiation and development of typhoons.

In the large-scale motion of the atmosphere there is a so-called geostrophic adaptation. This paper demonstrates that there is also a process of adaptation between the pressure and the wind field in the meso- and small-scale motion.From the scale analysis it is found that on the average in the equation of motion the term of the time derivative is one order of magnitude smaller than the main terms in the meso- and small-scale motion. Therefore it may be concluded that the motion of these scales also proceeds...

In the large-scale motion of the atmosphere there is a so-called geostrophic adaptation. This paper demonstrates that there is also a process of adaptation between the pressure and the wind field in the meso- and small-scale motion.From the scale analysis it is found that on the average in the equation of motion the term of the time derivative is one order of magnitude smaller than the main terms in the meso- and small-scale motion. Therefore it may be concluded that the motion of these scales also proceeds slowly under the condition of quasi-balanced forces just as that the large-scale motion proceeds quasi-geostrophically. If, however, in some way this quasi-balanced condition is disturbed, there must be a mechanism to bring the motion back to the quasi-balanced state. For the meso- and small-scale motion the inertia force (velocity advection), the coriolis force and the force of pressure gradient are in quasi-balanced state.The process to bring the motion to the state of quasi-balance of forces is called adaption process and the motion under quasi-balanced state is called quasi-steady process. The physical nature of these two processes is discussed in this paper. For meso-scale motion it is shown that in the adaption process D>>ζ, and in quasi-steady process D ≤ ζ, where D and ζ are respectively the divergence and the vorticity.If at certain time the quasi-balanced state is brokendown in certain limited region, further development of this motion may be calculated as an initial value problem. The computation concludes that in the initial short interval of time the meteorological elements undergo vigorous change leading to the reestablishment of the quasi-balanced state and then the motion goes into quasi-steady state.The equations of quasi-balanced condition for the meso- and small-scale motion may be written asThis suggests that for the motion of this scale P-field should be analyzed instead of height or pressure field.

A three-dimensional axial-symmetric model of cumulus development is here presented, with consideration of the effect of condensation feedback on the field of motion. A computational scheme of the system of equations concerned is given. For a case with initial temperature disturbance 1℃ and the vertical lapse rate of circumstances is slightly decreased with height, a calculation computed by the electric computer shows that a cumulus with a thickness more than 5-6 kms could be developed in about 20 minutes. In...

A three-dimensional axial-symmetric model of cumulus development is here presented, with consideration of the effect of condensation feedback on the field of motion. A computational scheme of the system of equations concerned is given. For a case with initial temperature disturbance 1℃ and the vertical lapse rate of circumstances is slightly decreased with height, a calculation computed by the electric computer shows that a cumulus with a thickness more than 5-6 kms could be developed in about 20 minutes. In the lower part of the cloud there is a moist-unstable region (a > 0) which becomes quasi-steady in its intensity and size. The field of motion and that of temperature are also approximately steady in this region. But in the upper moist-stable region of the cloud, the flow and temperature fluctuate greatly; in this region the convective element from the lower part of the cloud oscillates and gradually dissipates. All these characteristics are in accord with the phenomena observed in the atmosphere, i.e. the cumulus has a steady and flat base but an ever-changing top.