Closure to “Discussion of ‘Improved Particle Trajectory Calculations Through Turbomachinery Affected by Coal Ash Particles’” (1982, ASME J. Eng. Power, 104, p. 522)

1982 ◽  
Vol 104 (2) ◽  
pp. 523-523
Author(s):  
B. Beacher ◽  
W. Tabakoff ◽  
A. Hamed
Keyword(s):  
Particle Trajectory ◽  
Coal Ash ◽  
Trajectory Calculations

Particle trajectory calculations using finite element electromagnetic field maps

1988 ◽  
Vol 24 (6) ◽  
pp. 3126-3128 ◽  
Author(s):  
M.D.N. Lunney ◽  
R.B. Moore ◽  
J.P. Webb ◽  
B. Forghani
Keyword(s):  
Finite Element ◽  
Electromagnetic Field ◽  
Particle Trajectory ◽  
Trajectory Calculations

scholarly journals Energetic ion injection and formation of the storm-time symmetric ring current

2006 ◽  
Vol 24 (12) ◽  
pp. 3547-3556 ◽  
Author(s):  
L. Xie ◽  
Z. Y. Pu ◽  
X. Z. Zhou ◽  
S. Y. Fu ◽  
Q.-G. Zong ◽  
...  
Keyword(s):  
Electric Field ◽  
Ring Current ◽  
Particle Trajectory ◽  
Three Dimensional ◽  
Extensive Study ◽  
Current Injection ◽  
Ion Injection ◽  
Convection Electric Field ◽  
Trajectory Calculations ◽  
Current Region

Abstract. An extensive study of ring current injection and intensification of the storm-time ring current is conducted with three-dimensional (3-D) test particle trajectory calculations (TPTCs). The TPTCs reveal more accurately the process of ring current injection, with the main results being the following: (1) an intense convection electric field can effectively energize and inject plasma sheet particles into the ring current region within 1–3 h. (2) Injected ions often follow chaotic trajectories in non-adiabatic regions, which may have implications in storm and ring current physics. (3) The shielding electric field, which arises as a consequence of enhanced convection and co-exists with the injection and convection electric field, may cause the original open trajectories of injected ions with higher energy to change into closed ones, thus playing a role in the formation of the symmetric ring current.

Erosion Pattern of Twisted Blades by Particle Laden Flows

1983 ◽  
Vol 105 (4) ◽  
pp. 839-843 ◽  
Author(s):  
A. Hamed ◽  
S. Fowler
Keyword(s):  
Statistical Methods ◽  
Material Removal ◽  
Particle Trajectory ◽  
Particle Sizes ◽  
Trajectory Calculations ◽  
Particle Laden Flows ◽  
Turbomachine Blade

This paper presents the results of a study to predict turbomachine blade erosion by particle laden flows. Using statistical methods, this work combines particle trajectory calculations with experimental erosion data to determine the erosion of blades. The results of the calculations are presented to show the different patterns of blade material removal distribution over the surface of twisted stator blades for different particle sizes.

scholarly journals Improved Particle Trajectory Calculations Through Turbomachinery Affected by Coal Ash Particles

1981 ◽  
Author(s):  
B. Beecher ◽  
W. Tabakoff ◽  
A. Hamed
Keyword(s):  
Flow Field ◽  
Gas Turbines ◽  
Three Dimensional ◽  
Coal Ash ◽  
Two Dimensional ◽  
Flow Properties ◽  
Trajectory Calculations ◽  
Blade Thickness ◽  
Spline Fitting ◽  
Numerical Grid

Trajectories of small coal ash particles encountered in coal-fired gas turbines are calculated with an improved computer analysis currently under development. The analysis uses an improved numerical grid and mathematical spline-fitting techniques to account for three-dimensional gradients in the flow field and blade geometry. The greater accuracy thus achieved in flow field definition improves the trajectory calculations over previous two-dimensional models by allowing the small particles to react to radial variations in the flow properties. A greater accuracy thus achieved in the geometry definition permits particle rebounding in a direction perpendicular to the blade and flow path surfaces rather than in a two-dimensional plane. The improved method also accounts for radial variations in airfoil chord, stagger, and blade thickness when computing particle impact at a blade location.

Improved Particle Trajectory Calculations Through Turbomachinery Affected by Coal Ash Particles

1982 ◽  
Vol 104 (1) ◽  
pp. 64-68 ◽  
Author(s):  
B. Beacher ◽  
W. Tabakoff ◽  
A. Hamed
Keyword(s):  
Flow Field ◽  
Gas Turbines ◽  
Three Dimensional ◽  
Coal Ash ◽  
Two Dimensional ◽  
Flow Properties ◽  
Trajectory Calculations ◽  
Blade Thickness ◽  
Spline Fitting ◽  
Numerical Grid

Trajectories of small coal ash particles encountered in coal-fired gas turbines are calculated with an improved computer analysis currently under development. The analysis uses an improved numerical grid and mathematical spline-fitting techniques to account for three-dimensional gradients in the flow field and blade geometry. The greater accuracy thus achieved in flow field definition improves the trajectory calculations over previous two-dimensional models by allowing the small particles to react to radial variations in the flow properties. A greater accuracy thus achieved in the geometry definition permits particle rebounding in a plane perpendicular to the blade and flow path surfaces rather than in a two-dimensional plane. The improved method also accounts for radial variations in airfoil chord, stagger, and blade thickness when computing particle impact at a blade location.

Erosion Pattern of Twisted Blades by Particle Laden Flows

1983 ◽  
Author(s):  
A. Hamed ◽  
S. Fowler
Keyword(s):  
Statistical Methods ◽  
Material Removal ◽  
Particle Trajectory ◽  
Particle Sizes ◽  
Trajectory Calculations ◽  
Particle Laden Flows ◽  
Turbomachine Blade

This paper presents the results of a study to predict turbomachine blade erosion by particle laden flows. Using statistical methods, this work combines particle trajectory calculations with experimental erosion data to determine the erosion of blades. The results of the calculations are presented to show the different patterns of blade material removal distribution over the surface of twisted stator blades for different particle sizes.

Solid Particle Dynamic Behavior Through Twisted Blade Rows

1984 ◽  
Vol 106 (3) ◽  
pp. 251-256 ◽  
Author(s):  
A. Hamed
Keyword(s):  
Particle Size ◽  
Flow Field ◽  
Particle Trajectory ◽  
Particle Dynamic ◽  
Mixed Flow ◽  
Essential Information ◽  
Trajectory Calculations ◽  
Machine Performance ◽  
Performance Deterioration ◽  
Twisted Blade

Particle trajectory calculations provide the essential information required for predicting the pattern and intensity of turbomachinery erosion. Consequently, accurate flow field and blade geometry representation in the trajectory computational model are required to evaluate machine performance deterioration due to erosion. A model is presented that is simple and efficient yet versatile and general, applicable to axial, radial and mixed flow machines, and to inlets, nozzles, return passages and separators. Computations are presented for particle trajectories through a row of twisted vanes in the inlet flow field. The effect of the particle size on trajectory blade impacts, and on particle redistribution and separation are discussed.

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