The results show that at δ=0.5mm tip clearance due to decrease secondary flows loss the exicted vibration energy of flow is increased, then the scope of blade stall flutter is enlarged and the flutter-boundary is removed forward.

The results indicate that the algorithm can be used to accurately simulation the complex flow phenomena including the interaction of the shock wave and the boundary layer, flow separation and strong secondary flows in the turbomachinery.

This paper experimentally investigates three-dimensional velocity and cross-sectional pressure distributions in a gooseneck-like pipe. Three-dimensional flow structures in the pipe were analyzed. Characteristics of boundary-layer separation, and mechanisms of secondary flows due to bending and non-circular cross-section effects in the pipe were examined.

To compare the impact of end-wall suction on radial secondary flows in the blades, end-wall suction has been performed on two sets of cascades with their aspect ratios being 2.53 and 0.3 respectively under the condition that the upper and lower end-walls have a same suction rate of 1%.

Investigations of flow characteristics reveal that unsteady multi-crest velocity profile of the periodical flows and secondary flows of serpentine micro-channel greatly enhance liquid mixing.

The secondary flows for dilute gas-solid two-phase flow in a 90° curved duct of quadrate section are investigated numerically with two-fluid model with body-fitted-coordinates.

A positive curving of the blades has been found to be conducive to a decrease in the transverse pressure gradient at the end wall and a weakenin g of the end wall secondary flows.

The calculation results of a straight and a positively curved blade flow field show that the positively curved blades can create in the flow passage, especially at the suction side surface, a “C” shaped static pressure distribution. The latter effectively suppresses radial secondary flows.

Investigation of flow characteristics reveals that unsteady multicrest velocity profile of the periodical flows and secondary flows of serpentine microchannel greatly enhances liquid mixing.

The Circumferencially Bowed Blade (CBB) was proposed in the early 1960's, and is becoming a powerful means to control secondary flows in turbomachinery.

Since the flow fields inside centrifugal impellers are turbulent with strong eff ect of secondary flows and of complex ge ometry,it is hard to use S1 S2 theory an d invicid viscous iteration method for n umerical analysis,even at the design poi nt.

Determination of secondary flows in flow past a semi-infinite plate

The possible use of the solutions so obtained in order to describe secondary flows with repeated circulation in channels of simple shape (ring, circle, square, rhomb, rectangle, equilateral triangle) is demonstrated.

The steady secondary flows (Taylor vortices) of a viscous incompressible fluid between concentric rotating cylinders are studied.

Secondary flows develop during the flow of a liquid in curvilinear channels.

It is shown that near points of inflection of the profile of the leading edge of a flat wing strong self-induced secondary flows can be formed together with associated local peaks of the heat fluxes and the friction.

Using the motheds of undetermined' boundary value of electrode wall and smooth conjunction with solutions of different regions, the solution of one-dimensional ma-gnetohydrodynamic flow for the homopolar with incomplete electrodes is given. The homopolar with the annular wire electrodes and with complete electrodes are studied as examples. The flow field and induced magnetic field are calculated for some typical parameters, and all results agree with those obtained by finite difference method both...

Using the motheds of undetermined' boundary value of electrode wall and smooth conjunction with solutions of different regions, the solution of one-dimensional ma-gnetohydrodynamic flow for the homopolar with incomplete electrodes is given. The homopolar with the annular wire electrodes and with complete electrodes are studied as examples. The flow field and induced magnetic field are calculated for some typical parameters, and all results agree with those obtained by finite difference method both in magnitude and in distribution of the fields. The typical magnetohy-drodynamic phenomena of the effect of current dispersion and the Hartmann boundary layer are analysed with some emphsis, and the flow behavier in homopolar is disscussed by using above concepts. The results show that, the use of electrode of incomplete structure can increase the flow quantity, modify the Hartmann boundary layer, and control the secondary flow. These effects can be utilized in practical applications.

The paper shows that the stream-surface theory does not take account of the actions of secondary flow induced by the disturbance blade force. Based on the stream-surface, the generalised equation of such a secondary flow in an axial-turbomachine is deduced. Compressibility of flow is corrected with the local Much number of the primary flow to avoid the errors which are brought out by using only Much number upstream or a given average Much number in the traditional linearlized theory....

The paper shows that the stream-surface theory does not take account of the actions of secondary flow induced by the disturbance blade force. Based on the stream-surface, the generalised equation of such a secondary flow in an axial-turbomachine is deduced. Compressibility of flow is corrected with the local Much number of the primary flow to avoid the errors which are brought out by using only Much number upstream or a given average Much number in the traditional linearlized theory. The existance of the primary flow vorticity reflects in a so-called stream-sheet thickness 6 of the S2 stream surface of the primary flow. The b=1 represents an irrotational primary flow or the case in which the primary flow vortex is negligible small. The b=0 is a limiting case which represents that the vorticity of the primary flow becomes infinite. Then an attempt to approach the secondary flow problem of large shear and large disturbance flow is tested.The paper also shows the equations deduced from generalised equation under the conditions of the compressible axi-symmetric axial-inlet flow and the incompressible 2-D plane cascade flow. Then it shows that the generalised equation is appropriate for correcting the effects of the secondary flow on the stream surface flow after comparing with the equations in the reference [10], [11] and [12] when the assumptions of lifting line theory are adopted.

When an oil-flow from a primary pump is jetting through the inlet orifice of the throttling block, it is surrounded by the controlling oil-flow being jetted radially from the secondary pump and is subjected to hydrodynamic action by the latter. In this case, the radial oil-flow under the control of the secondary pump acts as a "throttling neck" on the axial primary flow and brings about some changes in characteristics of each outflow from this two-oilflow throttling block....

When an oil-flow from a primary pump is jetting through the inlet orifice of the throttling block, it is surrounded by the controlling oil-flow being jetted radially from the secondary pump and is subjected to hydrodynamic action by the latter. In this case, the radial oil-flow under the control of the secondary pump acts as a "throttling neck" on the axial primary flow and brings about some changes in characteristics of each outflow from this two-oilflow throttling block. The pressure drop between the inlet and outlet of this throttling block is hence one parameter dictated by the hydraulic characteristics of the secondary flow. Based on this principle, the author has made analyses on the controlling mechanism of the two-pump constant-flow valves, formulated relevant equations for calculation and made comparisons for the parameters calculated from various machines, either home-made or from abroad. The results obtaind are quite in conformity with the actual machine-performance.