Effects of Tip Cavity Depth, Width, and Location on the Leakage Flow in an Axial Turbine Cascade

El-Ghandour, Mohamed; Ibrahim, M.K.; Doi, Katsunori; Nakamura, Yoshiaki

doi:10.1299/jfst.5.558

Cited by 8 publications

(2 citation statements)

References 20 publications

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“…El-Ghandour et al. 7 researched the influence of squealer thickness and width on aerodynamic performance and confirmed that the size of the tip leakage vortex (TLV) depends on the geometry of the squealer tip. Tallman 8 optimized the squealer shape and found that the tip with rounded squealer cavity and corners is better than the conventional squealer tip in reducing m lea .…”

Section: Introductionmentioning

confidence: 98%

Effect of arbitrary blade tip design on tip leakage flow

Jin¹,

Song²,

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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Tip geometry modification is frequently used to suppress the tip leakage flow in the turbine cascade however a universally beneficial tip geometry modification design has not been fully discovered. In this paper, the two-surface coupling arbitrary blade tip design method in three-dimensional physical space which satisfies the simple trigonometric function law is proposed and the mathematical parametric description is presented. The effects of different arbitrary blade tips on tip leakage flow have been studied numerically in a highly loaded axial turbine cascade. The aerodynamic performance of different tips is assessed by the tip leakage mass flow rate and the total pressure loss coefficient at the exit section. The Kriging model and genetic optimization algorithm are used to optimize the arbitrary blade tips to obtain the optimal arbitrary blade tip. Compared with the flat tip, the tip leakage mass flow rate is decreased by 10.57% and the area-average total pressure loss coefficient at the exit section is reduced by 8.91% in the optimal arbitrary blade tip.

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Section: Introductionmentioning

confidence: 98%

Effect of arbitrary blade tip design on tip leakage flow

Jin¹,

Song²,

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…El-Ghandour 19 numerically studied the effects of the tip squealer with various depths, widths, and locations on the pattern of leakage flow and the performance of an axial turbine cascade. The results showed that the leakage mass flow rate and mass-averaged total pressure loss decreased as the depth and width of the tip cavity increased.…”

Section: Introductionmentioning

confidence: 99%

A study of angle parametric optimization of the composite honeycomb on turbine blade tip

Kong,

Ning,

Sun

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part G:

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To reduce the secondary flow loss of the high-pressure turbine caused by the tip leakage flow, the design of the composite honeycomb tip has been experimentally and numerically examined in this study. The arrangement angle of the composite honeycomb is defined and optimized using the radial basis function and genetic algorithm. The tip flow field of the high-pressure turbine blade with a 2.128 mm clearance is simulated by CFX 18.0, and the arrangement angle of the composite honeycomb is optimized to obtain a lower loss. Moreover, the flat tip, basic honeycomb tip, and optimized honeycomb tip are tested in a low-speed cascade test facility. The results show that the vortices and radial velocity induced by the honeycomb structure cavity increase the kinetic energy loss of the leakage flow and reduce the leakage flow rate. Compared with the basic honeycomb, the optimized honeycomb has a supplemental blocking effect on the tip leakage flow by reducing the crosswise pressure gradient in the blade tip. The optimized honeycomb also changes the outlet angle of the leakage flow in the tip clearance, reduces the leakage vortex, and the total pressure loss is further reduced by 2.5%.

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Effect of cooling injection on the leakage flow of a turbine cascade with honeycomb tip

Wang

Song

et al. 2018

Applied Thermal Engineering

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Effects of Tip Cavity Depth, Width, and Location on the Leakage Flow in an Axial Turbine Cascade

Cited by 8 publications

References 20 publications

Effect of arbitrary blade tip design on tip leakage flow

Effect of arbitrary blade tip design on tip leakage flow

A study of angle parametric optimization of the composite honeycomb on turbine blade tip

Effect of cooling injection on the leakage flow of a turbine cascade with honeycomb tip

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