Finite Fringe Holographic Interferometry Applied to a Right Circular Cone at Angle of Attack

1972 ◽  
Vol 39 (4) ◽  
pp. 897-903 ◽  
Author(s):  
R. C. Jagota ◽  
D. J. Collins
Keyword(s):  
Holographic Interferometry ◽  
Present Report ◽  
Angle Of Attack ◽  
Three Dimensional ◽  
Density Field ◽  
Circular Cone ◽  
Governing Equations ◽  
Wind Tunnel Experiments ◽  
Three Dimensional Flow ◽  
Half Angle

The successful application of holography to the study of three-dimensional flow fields due to phase objects has been reported in the literature. The present report extends this technique to the study of density fields around opaque bodies as would normally be encountered in wind tunnel experiments. The density field around a 10-deg half-angle cone at 0 and 10-deg angle of attack has been investigated by means of the finite fringe holographic interferometry. The three-dimensional density field obtained from the reduction of the interferograms was found to agree with that obtained from an analytical solution of the governing equations.

The Inertial Deposition of Fog Droplets on Steam Turbine Blades

1988 ◽  
Vol 110 (2) ◽  
pp. 155-162 ◽  
Author(s):  
J. B. Young ◽  
K. K. Yau
Keyword(s):  
Steam Turbine ◽  
Large Time ◽  
Turbine Blades ◽  
Three Dimensional ◽  
Test Cases ◽  
Governing Equations ◽  
Three Dimensional Flow ◽  
Pressure Cylinder ◽  
Steam Turbine Blades ◽  
A New Technique

A theoretical approach for calculating the rate of deposition of fog droplets on steam turbine blades by inertial impaction is described. Deposition rates are computed by tracking a number of droplet path lines through a specified blade-to-blade vapor flowfield and identifying the limiting trajectories that just intersect the blade surface. A new technique for performing the calculations efficiently has been developed whereby the mathematical stiffness of the governing equations is removed, thus allowing the numerical integration to proceed stably with comparatively large time increments. For high accuracy, the vapor flowfield is specified by a quasi-three-dimensional flow calculation involving both meridional and blade-to-blade plane calculations. Results are presented for two representative “test cases,” namely the final stage blading of the low-pressure cylinder of a 500 MW turbine and a typical stage in a high-pressure wet steam turbine. The effect on the deposition rate of fog droplet size and blade profile geometry is investigated for both on- and off-design flowfields. Comparisons are made with the predictions of a simplified theory for inertial deposition and the effect of blade rotation in flows with high pitch angles is discussed.

A Numerical Study of Three-Dimensional Convective Heat Transfer From a Window Covered by a Simple Partially-Open Plane Blind

2008 ◽  
Author(s):  
Patrick H. Oosthuizen ◽  
Murat Basarir ◽  
David Naylor
Keyword(s):  
Heat Transfer ◽  
Numerical Study ◽  
Three Dimensional ◽  
Side Surface ◽  
Governing Equations ◽  
Three Dimensional Flow ◽  
Buoyancy Forces ◽  
Fluid Properties ◽  
Higher Temperature ◽  
Open Plane

Heat transfer from the room-side surface of a window covered by a plane blind to the surrounding room has been considered. The window is at a higher temperature than the air in the room. There is an open gap between the blind system and the window at the top of the window and the effect of the size of this gap on the window-to-air heat transfer rate has been numerically examined. Three-dimensional flow has been considered. The flow has been assumed to be steady and laminar and it has been assumed that the fluid properties are constant except for the density change with temperature which gives rise to the buoyancy forces, this having been treated by using the Boussinesq approach. It has also been assumed that the flow is symmetrical about the vertical centre-plane of the window. The solution has been obtained by numerically solving the full three-dimensional form of the governing equations, these equations being written in terms of dimensionless variables. Results have only been obtained for a Prandtl number of 0.7. The effects of the other dimensionless parameters on the window Nusselt number have been numerically determined.

On the granular lubrication theory

2005 ◽  
Vol 461 (2062) ◽  
pp. 3255-3278 ◽  
Author(s):  
J.Y Jang ◽  
M.M Khonsari
Keyword(s):  
Granular Material ◽  
Reynolds Equation ◽  
Three Dimensional ◽  
Lubrication Theory ◽  
Slider Bearing ◽  
Governing Equations ◽  
Three Dimensional Flow ◽  
Generation Capacity ◽  
Side Flow ◽  
Generalized Reynolds Equation

The governing equations for the flow of a granular material within the context of the lubrication theory are derived. The resulting analysis gives a generalized Reynolds equation that predicts the pressure generation capacity in a bearing with consideration of side flow. A series of simulations are presented that characterize the three-dimensional flow behaviour of powder in a slider bearing.

A Three Dimensional Density Field Measurement of Transonic Flow From a Square Nozzle Using Holographic Interferometry

1977 ◽  
Vol 99 (4) ◽  
pp. 737-743 ◽  
Author(s):  
L. T. Clark ◽  
D. C. Koepp ◽  
J. J. Thykkuttathil
Keyword(s):  
Holographic Interferometry ◽  
Transonic Flow ◽  
Ambient Pressure ◽  
Pressure Ratio ◽  
Three Dimensional ◽  
Density Field ◽  
Technical Improvement ◽  
Potential Core ◽  
Core Part ◽  
Accurate Experimental Data

The three dimensional static density field was measured for transonic flow from a square nozzle using holographic interferometry. These measurements are presented in order to show the efficiency of this method for obtaining accurate experimental data of transonic flows. The accuracy of the measurement was estimated by operating the nozzle at a pressure ratio of 1.89 where the flow should expand to the ambient pressure with no afterexpansion effects. The standard deviation in the static density was approximately 1 percent over the isentropic (potential core) part of the flow. Data are also presented for a pressure ratio of 2.14 where afterexpansion effects are important. The method described represents a significant technical improvement in practical interferometry.

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