Computational analysis of the flow field near the boat-tail region of annular plug nozzles

2001 ◽  
Author(s):  
Kozo Fujii ◽  
Kazuhiro Imai ◽  
Tetsuya Sato
Keyword(s):  
Flow Field ◽  
Computational Analysis ◽  
Tail Region ◽  
Plug Nozzles

Film Cooling From Short Holes With Sister Hole Influence

2012 ◽  
Author(s):  
Marc J. Ely ◽  
B. A. Jubran
Keyword(s):  
Flow Field ◽  
Flow Structure ◽  
Film Cooling ◽  
Computational Analysis ◽  
Numerical Study ◽  
Vortical Flow ◽  
Injection Hole ◽  
Hole Configuration ◽  
Adiabatic Effectiveness ◽  
Structure Research

This paper reports a computational analysis on the effect of sister hole control on film cooling from short holes. The proposed method includes surrounding a primary injection hole by two or four smaller sister holes to actively maintain flow adhesion along the surface of the blade. A numerical study using the realizable k-ε turbulence model led to the determination that the use of sister holes significantly improves adiabatic effectiveness by countering the primary vortical flow structure. Research was carried out to determine the optimum hole configuration, arriving at the conclusion that placing sister holes slightly downstream of the primary injection hole improves the near-hole effectiveness, while placing sister holes slightly upstream of the primary hole improves downstream effectiveness. Similar results were found in evaluating both long and short hole geometries with a significantly less coherent flow field arising from the short hole. However, on the whole, the sister hole approach to film cooling was found to offer viable improvements over standard cooling regimes.

Computational analysis of flow field patterns in rigid and flexible lung airway models

2006 ◽  
Vol 21 (4) ◽  
pp. 343-344 ◽  
Author(s):  
K. Koombua ◽  
R.M. Pidaparti ◽  
P.W. Longest ◽  
K.R. Ward
Keyword(s):  
Flow Field ◽  
Computational Analysis ◽  
Field Patterns
Sign in / Sign up

Export Citation Format

Share Document