Air curtain application for leakage reduction in gas turbine shroud sealing

Wasilczuk, Filip; Flaszyński, Paweł; Kaczyński, Piotr; Szwaba, Ryszard; Doerffer, Piotr; Marugi, Krzysztof

doi:10.1016/j.ast.2021.106636

Cited by 17 publications

(4 citation statements)

References 8 publications

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“…In this perspective, Park et al [11] were adopted a passive control strategy, where fences were added to the casing in the passage region of the blade's tip to reduce the tip leakage vortices. Moreover, Wasilczuk et al [12] were introduced slots to the shroud sealing for a turbine rotor and use it as a passive flow control (named air curtain), which results from it an important velocity jet through the clearance gap.…”

Section: Htff 125-2mentioning

confidence: 99%

Experimental and Numerical Investigation of Controlled Rotomolded Axial Fan by Internal Air Injection at Gap Clearance

BOUANIK,

LARABI,

AZZAM

et al. 2023

Proceedings of the 9th World Congress on Mechanical, Chemical, and Material Engineering

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In the present era, axial fans play a pivotal role in crucial sectors of both industry and research. As a result, significant attention has been directed towards enhancing their aerodynamic performances. The ongoing inquiry is centered around elevating the aeraulic efficiencies of a fan produced through rotational molding techniques. First is adopting an active control by injecting a compressed air through 16 holes placed at the fan's hollow shroud ring of a dimension of 4 mm, by leveraging a benefit that involves in exploiting the hollow nature of the fan with the centrifugal effect. In the other hand, the fan's axial position with respect to the casing was investigated to know its influence on aerodynamics performances. The numerical investigation employing the K-ω SST turbulence model allows a detailed characterization of the flow modification around the fan. Results show that the swirling zone that forms around the shroud ring in investigated axial positions as a result of the interaction of the main and leakage flows with casing walls, has a significant impact on the change of the flow topology. In comparison to the baseline case, the aerodynamic performances are improved as the leakage flow and the swirling zone are both reduced. This improvement is translated into a gain of approximately 53% in aeraulic power and a leakage flow reduction of about 80%.

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Section: Htff 125-2mentioning

confidence: 99%

Experimental and Numerical Investigation of Controlled Rotomolded Axial Fan by Internal Air Injection at Gap Clearance

BOUANIK,

LARABI,

AZZAM

et al. 2023

Proceedings of the 9th World Congress on Mechanical, Chemical, and Material Engineering

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“…The numerical model is validated against the experimental measurements, which are described in detail in [38]. The leakage flow can be presented in form of discharge coefficient (C D ).…”

Section: Numerical Model Validationmentioning

confidence: 99%

“…The simulations used structured, hexahedral grids. A grid convergence study was performed and is presented in [38]. The grid in the proximity of the side walls was created so that the y + parameter was below 2, which allowed for good boundary layer prediction.…”

mentioning

confidence: 99%

Feasibility Study of Fluidic Sealing in Turbine Shroud

et al. 2021

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This paper analyses the methods for manufacturing turbine blades, focusing on the possibility of manufacturing slots in the region of the shroud. The reason for this analysis is the new flow control technique that can be used to limit the shroud leakage flow in a turbine—the air curtain. The air curtain uses a bypass slot to connect the upstream cavern of a shroud seal with the tip of a shroud fin. The bypass slot is an essential part of the solution, while at the same time introducing difficulties in the manufacturing process. Additionally, a parametric study on the bypass slot dimensions is performed using numerical simulations. The features of the numerical model and its validation against experimental data are presented. The parametric study includes the inlet and outlet dimensions, as well as the width of the slot. The most effective dimensions are shown, along with a possible explanation as to why they are the most effective. Interestingly, a slot that does not cover the whole span of the fin is more effective than a slot covering the whole span of the fin. This is caused by additional streamwise vortices that are created in the proximity of the bypass slot.

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“…Li 16 applied four configurations with or without labyrinth seal arranged on casing and rotor blade tip for computational simulations and found that the double-side labyrinth seal achieved the highest turbine stage efficiency. Wasilczuk et al 17 proposed a seal structure with air curtain through slots fully incorporated within the fin of labyrinth seal on the shroud. Their experimental and numerical analyses showed that mass flow reduction of the leakage can be reached up to 15%.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigations on leakage performance and flow mechanism of spiral groove seal for shrouded blade in axial turbine

Xiong

Zhu

Wang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Flow field of shroud leakage flow for a single-stage axial turbine has been investigated in this article. The spiral groove seal (SGS) is adopted for shrouded rotor blade to reduce tip leakage and improve turbine aerodynamic performance. A series of three-dimensional (3D) computational fluid dynamics (CFD) simulations are performed to investigate leakage characteristics and flow mechanism of various configurations with different angle, depth, width, and grooves number of the SGS. The original staggered labyrinth seal (LS) is also calculated for comparison. The results illustrate that small spiral groove angle can create more axial flow resistance; meanwhile, it will increase grooves number existing in the axial direction. Groove depth and tooth width will influence the number, shape, and strength of vortex in the groove. The leakage mass flow can be reduced by 36% and isentropic efficiency of the turbine can be increased by 0.26% when spiral groove angle, depth, and width of the SGS are 1.5°, 1.8 mm, and 0.8 mm, respectively. Overall, the optimal SGS can influence vortex generation and enhance energy dissipation in shroud cavity to reduce the leakage and suppress mixing loss of leakage flow with the main flow to some extent. It can be attributed to the combination of throttling effect and pumping effect of the SGS that realize leakage reduction and efficiency improvement. As a result, the SGS can effectively improve tip leakage flow of shrouded blade in axial turbine.

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Air curtain application for leakage reduction in gas turbine shroud sealing

Cited by 17 publications

References 8 publications

Experimental and Numerical Investigation of Controlled Rotomolded Axial Fan by Internal Air Injection at Gap Clearance

Experimental and Numerical Investigation of Controlled Rotomolded Axial Fan by Internal Air Injection at Gap Clearance

Feasibility Study of Fluidic Sealing in Turbine Shroud

Numerical investigations on leakage performance and flow mechanism of spiral groove seal for shrouded blade in axial turbine

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