The Wall Effect in Cavity Flow

1966 ◽  
Vol 88 (1) ◽  
pp. 132-136 ◽  
Author(s):  
D. K. Ai
Keyword(s):  
Flow Field ◽  
Flat Plate ◽  
Integral Equations ◽  
Nonlinear Theory ◽  
Digital Computer ◽  
High Speed ◽  
Cavity Flow ◽  
Channel Width ◽  
Wall Effect ◽  
Plate Location

A nonlinear theory for the calculation of the flow field of an oblique flat plate under blockage condition is given using the techniques of integral equations. Numerical results are obtained with the aid of a high-speed digital computer for the plate situated midchannel at values of the angle of attack from 10 to 90 deg and the channel width-chord ratio from 3 to 20. Although the theory is developed for arbitrary plate location, the midchannel case is of great interest due to the fact that most of the tests are performed at this position.

Study on the Field Dynamics of the Seal Cavity Flow Field for High Parameters Bellows Mechanical Seal

2011 ◽  
Vol 99-100 ◽  
pp. 1287-1292
Author(s):  
Wei An Meng ◽  
Mutellip Ahmat ◽  
Nijat Yusup ◽  
Asiye Shavkat
Keyword(s):  
Flow Field ◽  
High Speed ◽  
Three Dimensional ◽  
Cavity Flow ◽  
Mechanical Seal ◽  
Sealing Performance ◽  
Numerical Simulation Methods ◽  
Field Velocity ◽  
Computational Fluid Dynamics Cfd ◽  
The Impact

Based on the computational fluid dynamics (CFD) theory and numerical simulation methods, the seal cavity flow field for the bellows mechanical seal under such the high temperature, high pressure, high-speed as complex working conditions was numerically simulated, and the temperature field, velocity field, pressure field, turbulent kinetic energy and the flow field vorticity distribution of the medium of the seal cavity were obtained, the three-dimensional fluid flow in the seal cavity, the heat transfer characteristics and the impact on the sealing performance were analyzed in this researching.

Unsteady Loads on Supercavitating Hydrofoils of Finite Span

1966 ◽  
Vol 10 (02) ◽  
pp. 107-118
Author(s):  
Sheila Evans Widnall
Keyword(s):  
Numerical Solution ◽  
Numerical Method ◽  
Integral Equations ◽  
Digital Computer ◽  
High Speed ◽  
Three Dimensional ◽  
Numerical Results ◽  
Oscillatory Motion ◽  
Surface Theory ◽  
Finite Span

Linearized three-dimensional lifting-surface theory is derived for a supercavitating hydrofoil with finite span in steady or oscillatory motion through an infinite fluid. The resulting coupled-integral equations are solved on a high-speed digital computer using a numerical method of assumed modes similar to that used for fully wetted surfaces. Numerical results for lift and moment for both steady and oscillating foils are compared with other theories and experiments. Results of these calculations indicate that this numerical solution gives an efficient and accurate prediction of loads on a supercavitating foil.

Details of Axial-Compressor Shrouded Stator Cavity Flows

2001 ◽  
Author(s):  
Steven R. Wellborn
Keyword(s):  
Flow Field ◽  
Rotational Speed ◽  
High Speed ◽  
Tangential Velocity ◽  
Axial Compressor ◽  
Cavity Flow ◽  
Fast Response ◽  
Secondary Flows ◽  
Vortical Flow ◽  
Flow Structures

Data that reveal the structure and character of the flow in and near the cavities of compressor shrouded stators are reviewed. Results were obtained from low-speed multistage compressor measurements and simulations and generic high-speed cavity simulations. The experimental measurements were acquired with slow and fast response instrumentation. The numerical simulations were collected with two different flow solvers. The data are presented to provide compressor designers some indication of the complexities of the flow within shrouded stator cavities and to provide a datum for further studies on more complex geometries and flow conditions. The data suggest surprisingly similar flow structures within most cavities including spatial and temporal flow field variations. In general, the flow in the cavities involved fluid moving in the circumferential direction with lower momentum than powerstream fluid. The difference in momentum is adjusted through a shear layer in the radial direction near the powerstream/cavity interface. Circumferential variations in flow properties also exist, the most prominent being caused by the upstream potential influence of the downstream blade. This influence caused the fluid within the cavities near the leading edges of the airfoils to be driven radially inward relative to fluid near mid-pitch. Some data are presented that suggest powerstream secondary flows dictate which fluid particles are ingested in the downstream cavity across the stator pitch. Vortical flow structures, similar to those set up by a driven cavity, dominate the axial variations in flow. The position and structure of these vortical structures are dependent upon the powerstream flow field and the cavity geometry. Examining some interdependencies between cavity flow parameters concludes discussions of cavity flow field characteristics. A known relation between cavity leakage amount and tangential velocity is reiterated. Cavity rotational speed and stator exit swirl are also shown to influence the cavity tangential velocity. Increasing rotational speed tends to increase the tangential velocity through the cavity. Increasing the stator exit swirl reduces the tangential velocity increase.

Experiments on Circular-Arc and Flat-Plate Hydrofoils

1958 ◽  
Vol 2 (01) ◽  
pp. 34-67
Author(s):  
Blaine R. Parkin
Keyword(s):  
Flat Plate ◽  
High Speed ◽  
Cavity Flow ◽  
Hydrodynamic Characteristics ◽  
Water Tunnel ◽  
Pitching Moment ◽  
Two Dimensional ◽  
Circular Arc ◽  
Wide Range ◽  
Good Agreement

An investigation in the High-Speed Water Tunnel of the two-dimensional hydrodynamic characteristics of sharp-edged hydrofoils is described. The lift, drag, and pitching moment were measured in cavitating and noncavitating flows for flat-plate and circular-arc profiles. The theory of Wu for the forces on sharp-edged profiles in full-cavity flow and the experimental results showed good agreement over a wide range of attack angles.

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