The design of siphon pipes with a large turning diameter rectangle section is favourable to increase peak negative pressure values, make the pressure flow in pipe homogeneous and give bet-ter forciug state to the structure.

The tunnel is a familiar water release structure, when stream flows in the tunnel it will possiblely appear half pressure flow, which will produce a series of disadvantageous influences to tunnel structure, such as stressing state, discharge capacity and outlet energy dissipation.

Based on the test results on hydraulic characteristics of gate region of the Three Gorges Projects(TGPs) desilting bottom outlet, the problems of cavitation behind plane gate under high head and pressure flow condition during its operation are discussed, and the measures of decreasing cavitation or cavitation free operation are proposed.

On the basis of the model test results, the paper presents the primary analysis on starting law of silt in the pressure flow state and proposes the empirical formulas used for non silting condition in underground culvert. The results fit well with experimental data.

Due to the complicated flows in the stormwater drainage system(including subcritical and supercritical open channel flows,pressurized flow in closed conduit,side weir overflows,and transitional flows at junctions),a 1D numerical model of the unsteady flow is developed to study water stages and flow characteristics for different side weir arrangements,based on the observations provided by a 1∶22 undistorted Froude scale physical model under the steady inflow.

The first results of growing ZnO/GaN/α-Al2O3 heteroepitaxial structures in a low-pressure flow-through reactor using chemical-vapor deposition and stimulation with a plasma of radio-frequency discharge are reported.

The first results on the preparation of (0001)ZnO/(0001)GaN/(0001) α-Al2O3 heteroepitaxial structures by CVD in a low-pressure flow-type reactor are reported.

A maximal pharmacological dilatation was induced with carbochromen and dipyridamol and the pressure flow relation of the regional resistances within the coronary circulation investigated.

Coronary resistance (pressure/flow) increased with both ERG and ATN.

Besides anatomy of the coronary venous system, the pressure flow relationship during retroinfusion and the efficacy of pressure-regulated selective retroinfusion for targeted delivery of drugs is reported.

A second-order three-level scheme for solving three-dimensional compressible ideal flow problems is presented, and its stability is proved. By carrying out a large number of practical calculations of two-dimensional and three-dimen- sional flow problems, it is shown that advantages of the scheme are good accuracy, reduced computer time, simplicity of formulas, reduced program-hours, and adaptability to practical application. How to apply the scheme to flowfields with discontinuities is discussed in detail in...

A second-order three-level scheme for solving three-dimensional compressible ideal flow problems is presented, and its stability is proved. By carrying out a large number of practical calculations of two-dimensional and three-dimen- sional flow problems, it is shown that advantages of the scheme are good accuracy, reduced computer time, simplicity of formulas, reduced program-hours, and adaptability to practical application. How to apply the scheme to flowfields with discontinuities is discussed in detail in terms of some specific examples. How to construct the difference-nets for different configurations in different flow conditions is also analyzed. Finally, calculated results for some two-dimensional and three-dimensional complex configurations are given here. The results at fig. 8 are compared with the experiments of Ref. 4. It can be seen from the pressure distributions of Ref. 4 that there are really two subsonic regions in this kind of concave flowfields.

The losses occured in air-flow of compressor cascade are mainly to be controlled by occuring developing and separting of boundary-layer on the surfaces of blade. Therefore, by means of adapting the theory of compressible turbulent boundarylayer, utilizing some characteristic parameters such as momentum thickness, form factor, energy factor and other combination parameters, and then supposing the flow model of simple-power of velocity distribution in the wake behind the cascade, a simplified calculating equation...

The losses occured in air-flow of compressor cascade are mainly to be controlled by occuring developing and separting of boundary-layer on the surfaces of blade. Therefore, by means of adapting the theory of compressible turbulent boundarylayer, utilizing some characteristic parameters such as momentum thickness, form factor, energy factor and other combination parameters, and then supposing the flow model of simple-power of velocity distribution in the wake behind the cascade, a simplified calculating equation for total pressure loss coefficient of subsonic and transonic cascades of the compressor is derived. The basic calculating equation derived would be used for predicting the total pressure losses of both design condition and off-design condition of the compressor cascade.In this paper, a new curvilinear method for correcting the gaseous compressible effect under higher subsonic and transonic intake condition upstream of the cascade is. presented.According to this basic equation, the total pressure losses, for given compressor cascade are calculated, and then tested on the plane wind tunnel at various conditions, both the results are in better agreement.

The localized stability for vortices in arbitrary forms in an ideal incompressible fluid is investigated by linear approximation. The effects of curvature of the vortex stream lines and of spiral vortex on the stability are considered. Some general localized stability criteria for plane vortex sheets and spiral vortices are derived. The criteria are clear and convenient for application in engineering investigation of vortex stability. In particular it is also indicated that there exist lower and upper delimitations...

The localized stability for vortices in arbitrary forms in an ideal incompressible fluid is investigated by linear approximation. The effects of curvature of the vortex stream lines and of spiral vortex on the stability are considered. Some general localized stability criteria for plane vortex sheets and spiral vortices are derived. The criteria are clear and convenient for application in engineering investigation of vortex stability. In particular it is also indicated that there exist lower and upper delimitations for vortex stability and all previous investigations are in the realm of lower delimitation. If the stability condition of upper delimitation is not satisfied in the inner zone of a wake vortex, there must appear a low pressure cavity which will cause the vortex partialy falling away or break down the vortex. Using the upper delimitation criterion the generation mechanism of the Taylor vortex and the Karman vortex street can be conveniently explained.