Three-dimensional numerical modeling of flow field in rectangular shallow reservoirs

2014 ◽  
pp. 23-32 ◽  
Keyword(s):  
Numerical Modeling ◽  
Flow Field ◽  
Three Dimensional ◽  
Shallow Reservoirs

scholarly journals Three-dimensional numerical modeling of flow field in rectangular shallow reservoirs

2014 ◽  
pp. 11-19 ◽  
Author(s):  
T Esmaeili ◽  
T Sumi ◽  
S Kantoush ◽  
A Schleiss ◽  
S Haun
Keyword(s):  
Numerical Modeling ◽  
Flow Field ◽  
Three Dimensional ◽  
Shallow Reservoirs

Low Leakage Designs for Rotor Teeth and Honeycomb Lands in Labyrinth Seals

2008 ◽  
Author(s):  
Hasham H. Chougule ◽  
Douglas Ramerth ◽  
Dhinagaran Ramachandran
Keyword(s):  
Numerical Modeling ◽  
Flow Field ◽  
Three Dimensional ◽  
Labyrinth Seal ◽  
Wall Friction ◽  
Radial Clearance ◽  
Labyrinth Seals ◽  
Low Leakage ◽  
Total Leakage ◽  
Flow Turbulence

Design improvements on labyrinth seal teeth and a honeycomb land are examined by three-dimensional CFD numerical modeling of the flow field. The only objective is reduction of the total leakage through the new seal. CFD assumptions and analysis was validated by comparison with leakage data from labyrinth seal experiments conducted by Stocker [1]. The baseline chosen for comparison of sealing effectiveness is a conventional low clearance straight-through labyrinth seal with four teeth and a honeycomb land of symmetrical hexagonal cells. The proposed new seal has a staggered honeycomb land and straight teeth with an inclined notch. CFD predicts ∼17% reduction in seal leakage at a radial clearance of 0.005 inch (0.122mm) due to higher wall friction and flow turbulence.

Labyrinth Seal With Variable Height Teeth Tips for Efficient Leakage Control

2019 ◽  
Author(s):  
Hasham Chougule ◽  
Abhay Naik ◽  
Mohd. Qizar
Keyword(s):  
Experimental Data ◽  
Numerical Modeling ◽  
Flow Field ◽  
Three Dimensional ◽  
Labyrinth Seal ◽  
Leakage Flow ◽  
Baseline Model ◽  
Engine Operation ◽  
Proposed Modification ◽  
Radial Gap

Abstract A modification of a conventional straight tooth labyrinth seal with variable tooth height is proposed. The baseline and modified labyrinth seal teeth with solid land are examined by three-dimensional CFD numerical modeling of the flow field and evaluated for predicting the leakage through the seal during the engine operation. Stocker’s [1] static labyrinth seal experimental data is used to validate the CFD methodology used in this paper. The baseline and the proposed modified design [2] — “Labyrinth seal with variable tooth heights” are numerically studied with solid lands and evaluated to measure the reduction in leakages. The objective of this study is to provide an improved sealing effectiveness by restricting the leakage flow and controlling the seal leakage during the operation of the engine. In this study, a conventional straight-through four-tooth labyrinth seal with solid land is used as the baseline model. It is first evaluated at different unworn constant radial gaps — between the teeth tips and solid land. In the proposed modification, the height of the intermediate teeth of the baseline four-tooth are varied. The teeth heights are designed in such a way that intermediate longer teeth form a very small or tighter radial gap at start of operation. The shorter ones are designed based on the expected wear groove/rub depth considered by the seal designer. Results indicate that the proposed modification — Variable height teeth tips, reduce the seal leakage by over 50% compared to the baseline. The advantage of this modified design over a baseline seal is that at unworn or worn conditions, the teeth tips always forms a considerable tighter radial gap when compared with baseline seal. The achieved sealing is such that during engine operation of the seal, even if the seal gets worn, the overall leakage is significantly reduced.

Three-dimensional numerical modelling of flow field in shallow reservoirs

2015 ◽  
pp. 1-16 ◽  
Author(s):  
Taymaz Esmaeili ◽  
Nils Rüther ◽  
Tetsuya Sumi ◽  
Sameh A Kantoush ◽  
Stefan Haun
Keyword(s):  
Flow Field ◽  
Numerical Modelling ◽  
Three Dimensional ◽  
Shallow Reservoirs

Three-dimensional numerical modelling of flow field in shallow reservoirs

2016 ◽  
Vol 169 (5) ◽  
pp. 229-244 ◽  
Author(s):  
Taymaz Esmaeili ◽  
Tetsuya Sumi ◽  
Sameh A Kantoush ◽  
Stefan Haun ◽  
Nils Rüther
Keyword(s):  
Flow Field ◽  
Numerical Modelling ◽  
Three Dimensional ◽  
Shallow Reservoirs

THE INTERNAL FLOW FIELD ASSOCIATED WITH YAWED THREE-DIMENSIONAL RECTANGULAR CAVITIES

2000 ◽  
Vol 7 (3) ◽  
pp. 14
Author(s):  
Eric Savory ◽  
Norman Toy ◽  
Shiki Okamoto ◽  
Yoko Yamanishi
Keyword(s):  
Flow Field ◽  
Three Dimensional ◽  
Internal Flow
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