The effect of Reynolds number on normal and side forces on ogive-cylinders at high incidence

1985 ◽  
Author(s):  
P. LAMONT
Keyword(s):  
Reynolds Number ◽  
High Incidence

INVESTIGATION ON THE REYNOLDS NUMBER EFFECT ON FLOW ASYMMETRY OVER SLENDER BODIES AT HIGH INCIDENCE

2009 ◽  
Vol 23 (03) ◽  
pp. 385-388
Author(s):  
YUANJING WANG ◽  
ZHAOLIN FAN ◽  
HAO LI
Keyword(s):  
Reynolds Number ◽  
Wind Velocity ◽  
Reynolds Number Effect ◽  
Model Scale ◽  
Flow Asymmetry ◽  
Scale Models ◽  
High Incidence ◽  
Slender Bodies ◽  
The Stability

Investigation of Reynolds number effect on flow asymmetry over slender bodies at high incidence was conducted. Results show that increasing of wind velocity affects flow asymmetry by changing the intensity of the vortices; Model scale affects the distance between the main vortices, which determines the stability of the vortices and results in the discrepancy in the flow asymmetry over different scale models.

Thick airfoil at low Reynolds number and high incidence

1988 ◽  
Vol 25 (7) ◽  
pp. 669-671 ◽  
Author(s):  
S. Raghunathan ◽  
J. R. Harrison ◽  
B. D. Hawkins
Keyword(s):  
Reynolds Number ◽  
Low Reynolds Number ◽  
Thick Airfoil ◽  
High Incidence ◽  
Low Reynolds

Effects of Reynolds number of the high-incidence flow over double-delta wings

1997 ◽  
Author(s):  
A. Fritzelas ◽  
M. Platzer ◽  
S. Hebbar ◽  
A. Fritzelas ◽  
M. Platzer ◽  
...  
Keyword(s):  
Reynolds Number ◽  
Delta Wings ◽  
High Incidence

Low Reynolds Number Acceleration of Flat Plate Wings at High Incidence (Invited)

2016 ◽  
Author(s):  
Robbie J. Stevens ◽  
Holger Babinsky ◽  
Field Manar ◽  
Peter Mancini ◽  
Anya R. Jones ◽  
...  
Keyword(s):  
Reynolds Number ◽  
Flat Plate ◽  
Low Reynolds Number ◽  
High Incidence ◽  
Low Reynolds

An LP Turbine at Extreme Off-Design Operation

2013 ◽  
Author(s):  
Martin Lipfert ◽  
Martin Marx ◽  
Martin G. Rose ◽  
Stephan Staudacher ◽  
Inga Mahle ◽  
...  
Keyword(s):  
Reynolds Number ◽  
Flow Field ◽  
Three Dimensional ◽  
Leading Edge ◽  
Test Facility ◽  
Second Stage ◽  
Wide Range ◽  
High Incidence ◽  
Aero Engines ◽  
Lp Turbine

In a cooperative project between the Institute of Aircraft Propulsion Systems (ILA) and MTU Aero Engines GmbH a two-stage low pressure turbine with integrated 3D airfoil and endwall contouring is tested. The experimental data taken in the altitude test-facility study the effect of high incidence in off-design operation. Steady measurements are covering a wide range of Reynolds numbers between 40,000 and 180,000. The results are compared with steady multistage CFD predictions with a focus on the stator rows. A first unsteady simulation is taken into account as well. The CFD simulations include leakage flow paths with disc cavities modeled. Compared to design operation the extreme off-design high-incidence conditions lead to a different flow-field Reynolds number sensitivity. Airfoil lift data reveals changing incidence with Reynolds number of the second stage. Increased leading edge loading of the second vane indicates a strong cross channel pressure gradient in the second stage leading to larger secondary flow regions and a more three-dimensional flow field. Global characteristics and area traverse data of the second vane are discussed. The unsteady CFD approach indicates improvement in the numerical prediction of the predominating flow field.

A Low Pressure Turbine at Extreme Off-Design Operation

2013 ◽  
Vol 136 (3) ◽  
Author(s):  
Martin Lipfert ◽  
Martin Marx ◽  
Martin G. Rose ◽  
Stephan Staudacher ◽  
Inga Mahle ◽  
...  
Keyword(s):  
Reynolds Number ◽  
Flow Field ◽  
Three Dimensional ◽  
Leading Edge ◽  
Low Pressure ◽  
Test Facility ◽  
Low Pressure Turbine ◽  
Second Stage ◽  
Wide Range ◽  
High Incidence

In a cooperative project between the Institute of Aircraft Propulsion Systems and MTU Aero Engines GmbH, a two-stage low pressure turbine with integrated 3D airfoil and endwall contouring is tested. The experimental data taken in the altitude test-facility study the effect of high incidence in off-design operation. Steady measurements are covering a wide range of Reynolds numbers between 40,000 and 180,000. The results are compared with steady multistage CFD predictions with a focus on the stator rows. A first unsteady simulation is taken into account as well. The CFD simulations include leakage flow paths with disk cavities modeled. Compared to design operation the extreme off-design high-incidence conditions lead to a different flow-field Reynolds number sensitivity. Airfoil lift data reveals changing incidence with Reynolds number of the second stage. Increased leading edge loading of the second vane indicates a strong cross channel pressure gradient in the second stage leading to larger secondary flow regions and a more three-dimensional flow-field. Global characteristics and area traverse data of the second vane are discussed. The unsteady CFD approach indicates improvement in the numerical prediction of the predominating flow-field.

The observation of defects on (100) CdTe surfaces by chemical etching

1992 ◽  
Vol 50 (2) ◽  
pp. 1424-1425
Author(s):  
M.E. Lee
Keyword(s):  
Single Crystal ◽  
Grain Boundaries ◽  
Single Crystals ◽  
Chemical Etching ◽  
Crystalline Perfection ◽  
Crystalline Defects ◽  
High Incidence ◽  
Crystallographic Defects ◽  
Cdznte Substrates ◽  
Device Technology

The crystalline perfection of bulk CdTe substrates plays an important role in their use in infrared device technology. The application of chemical etchants to determine crystal polarity or the density and distribution of crystallographic defects in (100) CdTe is not well understood. The lack of data on (100) CdTe surfaces is a result of the apparent difficulty in growing (100) CdTe single crystal substrates which is caused by a high incidence of twinning. Many etchants have been reported to predict polarity on one or both (111) CdTe planes but are considered to be unsuitable as defect etchants. An etchant reported recently has been considered to be a true defect etchant for CdTe, MCT and CdZnTe substrates. This etchant has been reported to reveal crystalline defects such as dislocations, grain boundaries and inclusions in (110) and (111) CdTe. In this study the effect of this new etchant on (100) CdTe surfaces is investigated.The single crystals used in this study were (100) CdTe as-cut slices (1mm thickness) from Bridgman-grown ingots.

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