Rim Sealing of Rotor-Stator Wheelspaces in the Presence of External Flow

Chew, John W.; Green, T.; Turner, A. B.

doi:10.1115/94-gt-126

Cited by 39 publications

(32 citation statements)

References 13 publications

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“…Fig. 12 shows a comparison of results from the simple model with the data given by Chew et al (1994). In this case the pressure asymmetry in the annulus is caused by a row of 18 guide vanes at different axial positions (NGV=1 or 3) upstream of the seal.…”

Section: Stretched Axial Coordinatementioning

confidence: 94%

“…Campbell, unpublished work). However, Chew et al (1994) concluded that this method overpredicted the level of ingestion and attributed this to the neglect of inertial effects associated with the swirl component of velocity. This conclusion drew on experimental data and the results of CFD calculations which showed the influence of the inertial terms.…”

Section: Introductionmentioning

confidence: 99%

“…Looking at figures 8and 10 from the CFD solution suggests that this may be a reasonable approximation. For the calculations described below C h was taken as 1 and discharge coefficients were obtained from the correlations given by Chew et al (1994). These give the discharge coefficient as a function of the ratio of mean seal velocity to the axial component of the annulus velocity (u m /u ax ).…”

Section: Stretched Axial Coordinatementioning

confidence: 99%

“…As suggested by Campbell, the presence of a circumferentially uniform external flow tends to improve sealing, while circumferential asymmetries tend to increase ingestion. Chew et al (1994) gave experimental results for ingestion with the rim seal located at various distances downstream of a row of guide vanes. The experimental measurements and order of magnitude arguments supported the conclusion that disc pumping had only a secondary effect on the degree of ingestion for conditions most representative of engine operation.…”

Section: Introductionmentioning

confidence: 99%

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Computational and Mathematical Modeling of Turbine Rim Seal Ingestion

Hills

Chew

Turner

2002

Journal of Turbomachinery

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Understanding and modelling of main annulus gas ingestion through turbine rim seals is considered and advanced in this paper. Unsteady 3-dimensional computational fluid dynamics (CFD) calculations and results from a more elementary model are presented and compared with experimental data previously published by Hills et al (1997). The most complete CFD model presented includes both stator and rotor in the main annulus and the inter-disc cavity. The k-ε model of turbulence with standard wall function approximations is assumed in the model which was constructed in a commercial CFD code employing a pressure correction solution algorithm. It is shown that considerable care is needed to ensure convergence of the CFD model to a periodic solution. Compared to previous models, results from the CFD model show encouraging agreement with pressure and gas concentration measurements. The annulus gas ingestion is shown to result from a combination of the stationary and rotating circumferential pressure asymmetries in the annulus. Inertial effects associated with the circumferential velocity component of the flow have an important effect on the degree of ingestion.The elementary model used is an extension of earlier models based on orifice theory applied locally around the rim seal circumference. The new model includes a term accounting for inertial effects. Some good qualitative and fair quantitative agreement with data is shown.

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Section: Stretched Axial Coordinatementioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Stretched Axial Coordinatementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Computational and Mathematical Modeling of Turbine Rim Seal Ingestion

Hills

Chew

Turner

2002

Journal of Turbomachinery

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“…Figure 53 shows a typical aero multistage turbine cavity section. Several experimental studies have been reported that consider both simplified and complex disk cavity configurations (e.g., Chen; 127 Chew et al 128,129 Graber et al, 130 and Johnson et al 131,132 ). Cavity sealing is complex and has a significant effect on component and engine performance and life.…”

mentioning

confidence: 99%