Volume 6: Turbo Expo 2007, Parts a and B 2007
DOI: 10.1115/gt2007-27769
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The Influence of Shroud and Cavity Geometry on Turbine Performance — An Experimental and Computational Study: Part I — Shroud Geometry

Abstract: Imperfections in the turbine annulus geometry, caused by the presence of the shroud and associated cavity have a significant influence on the aerodynamics of the main passage flow path. In this paper the datum shroud geometry, representative of steam turbine industrial practice, was systematically varied and numerically tested. The study was carried out using a three-dimensional multi-block solver, which modelled the flow in a 1.5 stage turbine. The following geometry parameters were varied: - Inlet and exit c… Show more

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Cited by 16 publications
(12 citation statements)
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“…On the other hand, in passive methods, the blade/tip shape is modified to control the leakage flow. The tip full/partial shroud (winglets) [6][7][8][9] are examples of modifying the blade shape while squealers [10][11][12][13][14][15] and non uniform tip-gap 4) are examples of modifying the tip shape. The methods of modifying tip shape are preferred because it does not need external energy and also it reduces the blade weight and root stresses.…”
Section: Introductionmentioning
confidence: 99%
“…On the other hand, in passive methods, the blade/tip shape is modified to control the leakage flow. The tip full/partial shroud (winglets) [6][7][8][9] are examples of modifying the blade shape while squealers [10][11][12][13][14][15] and non uniform tip-gap 4) are examples of modifying the tip shape. The methods of modifying tip shape are preferred because it does not need external energy and also it reduces the blade weight and root stresses.…”
Section: Introductionmentioning
confidence: 99%
“…Combined with equation (9), equation (6) can be expressed as equation (10), indicating the reduction of turbine efficiency is directly proportional to the magnitude of entropy generation.…”
Section: Effect On Turbine Performancementioning
confidence: 99%
“…Schuler et al 9 investigated the influence of different rim seal geometries on the aerodynamic loss mechanism and the hot gas ingestion inside a lowpressure turbine. For the shroud leakage flow, Rosic et al 10,11 studied the effect of shroud geometric modification on the mainstream aerodynamics. In their study, a map of the possible turbine efficiency changes caused by different shroud geometry features were obtained, and reductions in shroud leakage losses were achieved by controlling the position and direction of the re-entry leakage flow.…”
Section: Introductionmentioning
confidence: 99%
“…Additionally, the flow inside the gap can feature particularly complex non-uniform 3D structures, leading to the formation of intermittent hot spots [2], which can significantly shorten the operational life due to the induced thermal stresses. In order to reduce the detrimental effects of the tip leakage flows, the designer can choose between two main strategies [3]: adding a shroud atop of the blade tip [4] or optimizing the tip section of a shroudless blade [5]. Shrouded blades have been very effective in the tip gap sealing and loss reduction.…”
Section: Introductionmentioning
confidence: 99%