Effects of Coolant Air Inlet Conditions on Turbulent Flow Between a Turbine Disk and its Casing

1981 ◽  
Vol 103 (4) ◽  
pp. 637-644
Author(s):  
T. Uzkan
Keyword(s):  
Velocity Profile ◽  
Turbulent Flow ◽  
Radial Velocity ◽  
Rotating Disk ◽  
Air Inlet ◽  
Stationary Wall ◽  
Radial Velocity Profile ◽  
Inlet Conditions ◽  
Core Rotation ◽  
Radial Outflow

An integral method to predict the performance of the incompressible, turbulent flow between a rotating disk and a parallel stationary wall, when there is radial outflow of ventilation air, is presented. Using this method, the effects of the inlet conditions of the ventilation air on the core rotation, on the radial velocity profile development, on the radial inflow rates, on the separation streamlines between outflow and inflow regions and on the disk torque coefficient are calculated and presented. The method is general enough to calculate other effects. The important conclusions are: (a) that inlet radial velocity profile should be skewed toward the stationary wall, to reduce radial inflow, and (b) that disk friction can be decreased by increasing the rotation of the ventilation air.

The Effects of Coolant Air Inlet Conditions on the Flow Regime Between a Turbine Disk and its Casing

1979 ◽  
Author(s):  
T. Uzkan
Keyword(s):  
Velocity Profile ◽  
Radial Velocity ◽  
Rotating Disk ◽  
Air Inlet ◽  
Stationary Wall ◽  
Disk Friction ◽  
Radial Velocity Profile ◽  
Inlet Conditions ◽  
Core Rotation ◽  
Radial Outflow

A method to predict the performance of the incompressible, turbulent flow between a rotating disk and a parallel stationary wall, when there is radial outflow of ventilation air, is presented. Using this method, the effects of the ventilation air inlet conditions on the core rotation, on the radial velocity profile development, on the radial inflow rates, on the separation stremlines between outflow and inflow regions and on the disk torque coefficient are calculated and presented. The method is general enough to calculate other effects. The important conclusions for the analysis of ventilation air inlet conditions are: (a) the inlet radial velocity profile should be skewed toward the stationary wall, to more effectively prevent radial inflow; (b) the disk friction can be decreased by increasing the rotation of the ventilation air.

Compressible Shear Flows in the Duct with Varying Cross-Sectional Area

1967 ◽  
Vol 71 (674) ◽  
pp. 128-132
Author(s):  
S. Fujii
Keyword(s):  
Differential Equation ◽  
Velocity Profile ◽  
Radial Velocity ◽  
Combined Effects ◽  
Sectional Area ◽  
Cross Sectional ◽  
Rotational Flows ◽  
Axial Velocity Profile ◽  
Actuator Disc ◽  
Radial Velocity Profile

Summary:The basic theory of the compressible non-swirling rotational flows through ducts with varying hub radii, associated with the concept of actuator discs, is described. The problem is simplified by considering a single-parameter in the radial velocity profile. Particular attention is given to the combined effects of the taper of inside walls and also of compressibility on the radial velocity and the axial velocity profile. The derived ordinary differential equation with non-homogeneous terms can be reduced to the well-known formula of classical actuator disc theories for the cylindrical passage. A numerical example is also presented.

The Development and Motion of Typhoon “Doris,” 1950

1951 ◽  
Vol 32 (9) ◽  
pp. 326-333 ◽  
Author(s):  
George P. Cressman
Keyword(s):  
Velocity Profile ◽  
Radial Velocity ◽  
The West ◽  
Low Latitude ◽  
West Side ◽  
Ridge Line ◽  
Coriolis Forces ◽  
Radial Velocity Profile ◽  
High Level ◽  
Subtropical Ridge

The development and motion of typhoon “Doris,” which was observed during the first two weeks of May, 1950, are studied. The development of the storm is examined with respect to previously published theories of storm formation. The original deepening occurred in the low latitude portion of an extended trough, after the fracture of the trough. This is in agreement with a model proposed by Riehl. The motion of the deepening storm relative to the high-level flow patterns differed from previously studied examples in that the deepening occurred as the low-level cyclone moved from under the west side of an upper anticyclone toward a position under an upper cyclone. The storm developed as two cyclonic vortices, which gradually merged into one, in agreement with a principle of Fujiwhara. The motion of the storm northward, as it broke through the subtropical ridge line, is shown. After examination of several possibilities, this motion is attributed to the resultant of all the Coriolis forces acting on the storm, as discussed by Rossby. The suggestion is made that this resultant force becomes prominent in determining the motion of the storm due to changes in the radial velocity profile and the increasing geographical extent of the storm.

Laser Velocimeter Measurements in a Centrifugal Flow Pump

1989 ◽  
Vol 111 (3) ◽  
pp. 205-212 ◽  
Author(s):  
S. M. Miner ◽  
R. J. Beaudoin ◽  
R. D. Flack
Keyword(s):  
Velocity Profile ◽  
Radial Velocity ◽  
Flow Rate ◽  
Design Flow ◽  
Flow Rates ◽  
Blade Loading ◽  
Recirculating Flow ◽  
Design Values ◽  
Radial Velocity Profile ◽  
Flow Pump

A laser velocimeter was used to measure velocities within the impeller and volute of a centrifugal pump. Measurements were made at four circumferential and eight radial positions. Flow rates ranged from 40 to 105 percent of design flow. Blade-to-blade profiles for the four circumferential positions indicate the flow is circumferentially asymmetric around the pump even at the design flow. Blade-to-blade profiles show normal blade loading for 90 percent of the impeller, with reverse and zero loading occurring in the outer 10 percent of the impeller for design flow. Reversed blade loading over greater portions of the impeller is seen at off-design flow. At 40 percent of design flow, recirculating flow within the impeller was found. Axial traverses across the impeller show the radial velocity profile skewed toward the hub surface at the inlet and away from the hub surface at the exit. The stagnation point on the tongue moved from the outside to the inside as the flow rate was increased from 40 to 105 percent of design. Values for slip range from 0.96 to 0.71 from the inlet to the exit.

scholarly journals Tsallisian Gravity and Cosmology

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Kavoos Abbasi ◽  
Shirvan Gharaati
Keyword(s):  
Velocity Profile ◽  
Radial Velocity ◽  
Second Law ◽  
Tsallis Statistics ◽  
Radial Velocity Profile

In this paper, we adopt the Verlinde hypothesis on the origin of gravity as the consequence of the tendency of systems to increase their entropy and employ the Tsallis statistics. Thereinafter, modifications to the Newtonian second law of motion, its gravity, and radial velocity profile are studied. In addition, and in a classical framework, the corresponding cosmology and also its ability in describing the inflationary phases are investigated.

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