Optimization of cooling structures in gas turbines: A review

Zhang, Guohua; Zhu, Rui; Xie, Gongnan; Li, Shulei; Sunde, Bengt

doi:10.1016/j.cja.2021.08.029

Cited by 56 publications

(12 citation statements)

References 97 publications

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“…The intensity of the enforced axial flow largely dictates the temperature of water lubricated bearings. Effective heat dissipation can be achieved through three strategies: inducing turbulent flow, ensuring a temperature gradient, and improving the heat transfer area [298]. Specific strategies such as film hole cooling can further improve the heat transfer performance [299].…”

Section: Management Of Thermal Effectsmentioning

confidence: 99%

Design and optimization of fluid lubricated bearings operated with extreme working performances—a comprehensive review

Zhang,

Huang,

Chen

et al. 2024

Int. J. Extrem. Manuf.

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Fluid lubricated bearings have been widely adopted for supporting components of high-end equipments in the field of metrology, semi-conductor, aviation, strategic defense, ultra-precision manufacturing, medical treatment and power generations. These fields all involve extreme working conditions such as ultra-high moving precision, ultra-high rotation speed, ultra-heavy bearing load, ultra-high environmental temperature, high radiation and high vacuum, which present challenges for the design and optimization of reliable fluid lubricated bearings. Breakthrough of any related bottlenecks will promote the development course of high-end equipments. To further promote the advancement of high-end equipments, this paper reviews the design and optimization of fluid lubricated bearings operated with typical extreme working performances. Targeting on the realization of extreme working perfor mances, the current challenges, the current solutions, the underlying deficiencies and the promising developing directions regarding to the design and optimization of fluid lubricat ed bearings are systematically pointed out. This paper can provide guidance for choosing suitable fluid lubricated bearings and optimizing their structures based on required extremeworking performances.

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Section: Management Of Thermal Effectsmentioning

confidence: 99%

Design and optimization of fluid lubricated bearings operated with extreme working performances—a comprehensive review

Zhang,

Huang,

Chen

et al. 2024

Int. J. Extrem. Manuf.

Self Cite

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“…The high temperature rises and low emissions are the development trend of combustors. Therefore, to develop more efficient gas turbines that better protect combustors and turbine blades from erosion in high-temperature environments while extending their service life, it is necessary to develop efficient cooling systems for gas turbines [3,4]. Cooling holes play a crucial role in maintaining safe operating temperatures for engine components [5,6].…”

Section: Introductionmentioning

confidence: 99%

Improving Film Cooling Efficiency with Lobe-Shaped Cooling Holes: An Investigation with Large-Eddy Simulation

Wang

Zhao

et al. 2023

Applied Sciences

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Shaped cooling holes have received considerable attention in recent years due to their potential to improve heat transfer while minimizing pressure drop. In this study, the effects of lobe-shaped cooling holes on film cooling performance and turbulent flow characteristics are investigated using large-eddy simulation (LES). The LES approach was validated by comparing the calculated film cooling effectiveness with experimental data. The results show that well-designed lobe-shaped cooling holes can improve the cooling efficiency by up to 37% and reduce the total pressure drop. Additionally, the cooling jets of lobe-shaped cooling holes have a smaller angle to the wall surface, indicating better wall attachment. However, poorly designed lobe-shaped cooling holes can reduce the cooling efficiency. Overall, this study suggests that lobe-shaped cooling holes are a promising technology for improving gas turbine engine performance.

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“…1 To maximize the engine efficiency and reduce its fuel consumption, turbine inlet temperature (TIT) of contemporary aeroengine is often far beyond the melting point of Ni-based single crystal superalloys. 2 Therefore, film cooling technology has been adopted extensively to protect turbine blades from being melted in hot gas, as shown in Figure 1A,B. Experimental and numerical studies have proved that the cooling effect of the shaped holes showed better performance that of the circular FCHs.…”

Section: Introductionmentioning

confidence: 99%

“…Ni‐based single crystal superalloys are widely used in aero‐engine turbine blades due to their excellent fatigue and creep resistance in high temperature 1 . To maximize the engine efficiency and reduce its fuel consumption, turbine inlet temperature (TIT) of contemporary aero‐engine is often far beyond the melting point of Ni‐based single crystal superalloys 2 . Therefore, film cooling technology has been adopted extensively to protect turbine blades from being melted in hot gas, as shown in Figure 1A,B.…”

Section: Introductionmentioning

confidence: 99%

Research on low‐cycle fatigue behavior of Ni‐based single crystal superalloy with shaped film cooling holes at high temperature

Li,

Wen,

Meng

et al. 2023

Fatigue Fract Eng Mat Struct

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Film cooling holes (FCHs) geometric structure significantly affects low‐cycle fatigue (LCF) of the single crystal turbine blade. This study investigates the LCF behavior of Ni‐based single crystal plate specimens with two different structure FCHs, including elliptical and fan‐shaped FCHs, by high temperature fatigue tests and crystal plasticity simulation. The results show that the LCF life of the fan‐shaped FCHs is shorter than those of the elliptical FCHs. The fracture characteristics and microstructure evolution of different structure FCHs are dissimilar. Oxidation affects the fatigue crack nucleation process at the FCH edge. The resolved shear stress (RSS) around fan‐shaped FCHs is greater than elliptical FCHs under one cyclic stress, and the area with larger RSS is consistent with fatigue crack nucleation position. The early LCF failure is mainly attributed to the high temperature oxidation of the local slip deformation induced by RSS concentration around the FCHs.

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Optimization of cooling structures in gas turbines: A review

Cited by 56 publications

References 97 publications

Design and optimization of fluid lubricated bearings operated with extreme working performances—a comprehensive review

Design and optimization of fluid lubricated bearings operated with extreme working performances—a comprehensive review

Improving Film Cooling Efficiency with Lobe-Shaped Cooling Holes: An Investigation with Large-Eddy Simulation

Research on low‐cycle fatigue behavior of Ni‐based single crystal superalloy with shaped film cooling holes at high temperature

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