Computation of Cavity-by-Cavity Flow Development in Generic Labyrinth Seals

Rhode, D. L.; Nail, Gregory H.

doi:10.1115/1.2920866

Cited by 8 publications

(5 citation statements)

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“…The authors Rhode and al. [10] use these estimates for their static simulation. But, with the rotation of the rotor, the tangential speed of the flow at the outlet is important so that we also estimate the kinetic energy losses at the outlet using the total speed instead of the axial speed in the above formula.…”

Section: Choice Of Boundary Conditionsmentioning

confidence: 99%

“…The analytical leakage flow was correlated to the experimental results on straight seals, giving a more precise semi-empirical solution. But empirical methods are only successful when applied to seals that are very similar to those which were empirically studied [10]. Nowadays, numerical methods with computational fluid dynamics (CFD) are used to predict seals performance.…”

Section: Introductionmentioning

confidence: 99%

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Validation of a CFD model for hydraulic seals

Roy¹,

Guibault

2009

International Journal of Fluid Machinery and Systems

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Optimization of seal geometries can reduce significantly the energetic losses in a hydraulic seal [1], especially for high head runner turbine. In the optimization process, a reliable prediction of the losses is needed and CFD is often used. This paper presents numerical experiments to determine an adequate CFD model for straight, labyrinth and stepped hydraulic seals used in Francis runners. The computation is performed with a finite volume commercial CFD code with a RANS low Reynolds turbulence model. As numerical computations in small radial clearances of hydraulic seals are not often encountered in the literature, the numerical results are validated with experimental data on straight seals and labyrinth seals. As the validation is satisfactory enough, geometrical optimization of hydraulic seals using CFD will be studied in future works.

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Section: Choice Of Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Validation of a CFD model for hydraulic seals

Roy¹,

Guibault

2009

International Journal of Fluid Machinery and Systems

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“…Non-dimensional sealing flow rate and numerical work of Stocker (1975), Wittig et al (1987) and Rhode et al (1992aRhode et al ( & b. 1993Rhode et al ( , 1994.…”

Section: Compressor and Turbine Stator -Well Heatingmentioning

confidence: 99%

A Review of Some Current Problems in Gas Turbine Secondary Systems

Turner

Long

Childs

et al. 1997

Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration

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This paper reviews the current position of five major problem areas in gas turbine secondary air system design. Although the problems are of primary interest to the designer of the coolant flow paths, since they directly affect the temperature, the stresses and thus the life of the major rotating components, three of the problems interact with the main gas path and are thus also the concern of the mainstream aerodynamicist. The five problems reviewed are: prediction of the flow distribution and heat transfer in the high pressure compressor drive cone cavity from the turbine to the rim of the HP compressor running underneath the combustion chamber, the flow penetration and heat transfer in the multiple rotating cavities formed by the multiple discs of the high pressure compressor with a rotating shaft running through the bores; the control of ingestion of hot turbine mainstream gas into the rotor-stator wheelspaces through the rim-seals; the problem of compressor and turbine stator-well heating, particularly compressor stator-wells in which excessive temperatures have been occasionally measured and finally, the pre-swirl coolant system which has to take the blade cooling air across from the stationary casing to the rotating turbine disc in the most advantageous manner.

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“…There are variations in local static pressure due to stagnation points and sudden expansions as the fluid flows in and out of different chambers of seals. 4,5 The labyrinth seal construction is very complicated; the key parameters affected the discharge characteristics include the pressure ratio and rotation speed, while rotation factor showed its importance only at the high rotating speed. 6,7 Therefore, static rigs were preferred in most experiments; a 2-D rig can be used to provide nearly the same results as an ax symmetric 3-D rig.…”

Section: Introductionmentioning

confidence: 99%

“…As flow passes through a labyrinth seal, total pressure is lost continuously along the length of the seal. There are variations in local static pressure due to stagnation points and sudden expansions as the fluid flows in and out of different chambers of seals …”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of effect of tooth geometrical parameters to flow characteristics in slant labyrinth seals

Zhang

Dou

Hong

et al. 2018

Concurrency and Computation

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Summary An experiment investigation was made to study the influence of the geometry parameters of slant straight‐through labyrinth seals on sealing characteristics. 22 models with different geometry parameters were designed, and the geometry parameters studied include seal clearance, fin height, fin pitch, fin tip thickness, and fin number. The results showed that, when p0/pn ranged from 1.2 to 1.8, the discharge coefficient increased with the drop pressure ratio, seal clearance, and fin tip thickness and decreased with fin height, fin pitch, and fin number. The rank of sensitivity of each parameter's variation in the unit size on sealing characteristics is seal clearance, fin tip thickness, fin pitch, back angle, fin height, and front angle. The correlation of different parameters were summarized for the designing of advanced labyrinth seals.

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Computation of Cavity-by-Cavity Flow Development in Generic Labyrinth Seals

Cited by 8 publications

References 0 publications

Validation of a CFD model for hydraulic seals

Validation of a CFD model for hydraulic seals

A Review of Some Current Problems in Gas Turbine Secondary Systems

Experimental investigation of effect of tooth geometrical parameters to flow characteristics in slant labyrinth seals

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