Parameter optimization of the composite honeycomb tip in a turbine cascade

Wang, Yabo; Yu, Jianyang; Song, Yanping; Chen, Fu

doi:10.1016/j.energy.2020.117236

Cited by 10 publications

(6 citation statements)

References 18 publications

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“…The basic tip honeycomb was taken from the optimized composite honeycomb structure of Wang. 32 The upper hexagonal prism and bottom hexagonal length ratio b bot /b tip , the frustum height δ 2 and cavity depth δ hc ratio δ 2 /δ hc , and the honeycomb cavity depth δ hc are all optimized and verified. The tip honeycomb parameters and blade profile are amplified in the same ratio.…”

Section: Cascade Blade and Tip Configurationsmentioning

confidence: 91%

“…The advantage of the k-ω turbulence model is the near-wall treatment at a low Reynolds number, which is more accurate for leakage flow prediction. 32,36 The simulations were performed on a computer with an AMD 3900X CPU and 64 GB of 2400-MHz memory, and the total time for solving a single case is approximately 5 h.…”

Section: Methodsmentioning

confidence: 99%

“…The large-scale vortices were supported by the injection in deep cavities, the vortices were limited to one side of the cavity in shallow cavities, and the least leakage was generated by the injection with the downstream side and the small injection angle. Wang et al 32 optimized the composite honeycomb tip. The optimization variables were the cavity depth, height ratio, and length ratio of the honeycomb prism, and the simulated averaged loss was reduced by 5.49% in the optimal case.…”

Section: Introductionmentioning

confidence: 99%

“…To enhance the sealing characteristics, the arrangement angle of the honeycomb at the blade tip needs to be considered. Based on the honeycomb tip of Wang, 32 this study changes and optimizes the arrangement angle of the honeycomb. Experimental and numerical investigations are carried out to further determine the effect of the arrangement angle of the honeycomb on the tip leakage flow (TLF) and secondary flow.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Cascade Blade and Tip Configurationsmentioning

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…As for the novel tip, Fu 19 applied the honeycomb sealing structure to the tip and discovered that the cavity vortex could restrain the TLF effectively. To further improve the aerodynamic performance, Wang 20 applied the parameterization design to Fu’s honeycomb tip and adopted the optimization method. Through the experiment and the simulation calculation, the result indicated that the optimal composite honeycomb tip decreased the averaged loss at the exit section by up to 5.49%.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of novel tip configurations in a turbine cascade

Jin

Song

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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Two novel tip modeling methods are proposed in this paper. One novel tip is established by the mathematical method and the other is generated by the B-spline surface. And the genetic algorithm, the orthogonal design and the Kriging model are applied to optimize two kinds of novel tips numerically. The optimal mathematical tip and the optimal B-spline tip are acquired respectively. The aerodynamic tests were investigated at the wind tunnel test section, including the flat tip, the squealer tip, the optimal mathematical tip and the optimal B-spline tip. The static pressure distributions on the casing and the blade surface were measured by the pressure taps. Meanwhile, the secondary flow and the loss were obtained by the five-hole probe at the exit section. A comparison of the simulation analysis results with the experimental results shows good agreement. Compared with the flat tip, the measured loss on the squealer tip, the optimal mathematical tip and the optimal B-spline tip is decreased by 7.2%, 10.5% and 12.6% respectively.

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