A critical review on gas turbine cooling performance and failure analysis of turbine blades

Chowdhury, Taspia Shawkat; Mohsin, Fatima Tasneem; Tonni, Morium Mannan; Mita, Mita Noor Hasan; Ehsan, M. Monjurul

doi:10.1016/j.ijft.2023.100329

Cited by 45 publications

(8 citation statements)

References 84 publications

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“…The performance of an aircraft engine relies heavily on the temperature at the turbine inlet, and increasing the preturbine inlet temperature is a crucial strategy for improving engine performance [1,2]. In recent years, the widespread adoption of high-temperature materials, especially nickel-based single-crystal high-temperature alloys in turbine blades, has led to a continuous rise in turbine inlet temperatures [3,4].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Microhole Quality of Nickel-Based Single Crystal Superalloy Processed by Ultrafast Laser

Zhang,

Song,

Luo

et al. 2024

Coatings

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The geometric accuracy and surface quality of thin-film cooling holes have a significant impact on the cooling efficiency and fatigue life of aeroengine turbine blades. In this paper, we conducted experimental research on the processing of nickel-based single-crystal high-temperature alloy DD6 flat plates using different femtosecond laser processes. Our focus was on analyzing the effects of various laser parameters on the geometric accuracy results of microholes and the quality of the surfaces and inner walls of these holes. The results demonstrate that femtosecond laser processing has great influence on the geometrical accuracy and surface quality results of film cooling holes. Notably, the average laser power, focus position, and feed volume exert a significant influence on the geometric accuracy results of microholes. For instance, a higher laser power can damage the microhole wall, thereby leading to the formation of tiny holes and cracks. Additionally, microholes exhibit optimal roundness and taper values when using a zero defocus volume. Moreover, increasing the feed distance results in enhanced entrance and exit roundness, whereas scanning speed has a negligible impact on microhole roundness.

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Section: Introductionmentioning

confidence: 99%

Investigation of Microhole Quality of Nickel-Based Single Crystal Superalloy Processed by Ultrafast Laser

Zhang,

Song,

Luo

et al. 2024

Coatings

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“…High operating temperature (above 2000 K) is required to elevate thermal efficiency and output capability of this century's gas turbines [1]. But temperature in the turbine is far beyond the blade material-softening temperature which will create extreme thermal stress owing to metallurgical constraints, and thus, there is a need to limit the temperature to prevent blade failure [2]. Advances in cooling techniques play a vital role to prolong the turbine blade lifetime [3].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the Thermohydraulic Performance in a Double Passage Square Duct with the Use of Inclined Ribs of 45°: A Comparative Computational Study

Kaplan

2024

International Journal of Energy Research

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The modern gas turbines need to run at very high inlet temperature to promote their power output. Thus, improvements in cooling technologies play a significant role for enhancing the gas turbine blade life. In this paper, thermohydraulic performance (THP) of a two-pass square channel with inclined ribs at 45° was scrutinized employing the k–ε realizable model with enhanced wall treatment in ANSYS Fluent. The calculations were performed for the rib pitch to height ratio (p/e) of 5-10, rib height to hydraulic diameter ratio (e/Dh) of 0.1-0.2, and Reynolds number (Re) of 20,000-40,000. Detailed analysis of the flow structure in a double passage square duct was carried out to understand the interaction of the rib and bend-induced secondary flows and its contribution to heat transfer enhancement for the rib configurations with distinct p/e and e/Dh, which was not available in any other existing numerical or experimental investigations. The results revealed that the ribs with higher e/Dh generated the stronger stream-wise secondary flows which led to the augmentation of the cooling performance with the disadvantage of pressure loss increment. The maximum THP of 26.55% was achieved with the ribbed configuration having p/e=5 and e/Dh=0.1 at Re=20,000. The new correlations were developed from the computational data to predict the normalized Nusselt number and friction factor (Nu/Nu0 and f/f0, where 0 is the correlation), taking the e/Dh and flow Re into consideration.

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“…Also, the blades and other components of the hot path of gas turbines experience service-induced degradation during operation, which may be normal or hastened owing to multiple factors such as thermal fatigue, creep, and corrosion. Thus, these blades require regular maintenance to avoid unexpected dangers [5][6][7][8]. Today competition to improve power plants has increased the ability to carry out many continuous maintenance processes, which leads to high efficiency and safety standards [9].…”

Section: Introductionmentioning

confidence: 99%

Microstructural evaluation of welded joints of ASTM Mar-M247 superalloy using ERNiCrMo-3 filler alloy

Alomairi,

Driss,

Abood

2024

Matéria (Rio J.)

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ASTM Mar-M247 is one of the superalloys used to manufacture gas turbine blades in power stations. This paper studies the microstructure across welded joints of a turbine blade made of a high-strength material (Mar-M247 alloy) employing AWS ERNiCrMo-3 as a filler alloy. This process was carried out using gas tungsten arc welding (GTAW). The dendritic and interdendritic structures were observed in the fusion zone. The results also showed the presence of epitaxial growth at the interface between the weld metal and the base alloy without solidification cracks. Al and Co concentrations gradually decrease towards the weld metal zone during the solidification process, while Cr content increases towards the fusion zone. Vickers hardness revealed that the hardness in the heat-affected zone (HAZ) is higher than that of the base metal and the weld metal zone, the average in the HAZ is 340HV, while in the base metal and the fusion zone is 322HV, 284HV respectively. Coarse grains in the HAZ were found with an agglomeration of carbides at the grain boundaries due to the input heat of the welding process.

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A critical review on gas turbine cooling performance and failure analysis of turbine blades

Cited by 45 publications

References 84 publications

Investigation of Microhole Quality of Nickel-Based Single Crystal Superalloy Processed by Ultrafast Laser

Investigation of Microhole Quality of Nickel-Based Single Crystal Superalloy Processed by Ultrafast Laser

Enhancement of the Thermohydraulic Performance in a Double Passage Square Duct with the Use of Inclined Ribs of 45°: A Comparative Computational Study

Microstructural evaluation of welded joints of ASTM Mar-M247 superalloy using ERNiCrMo-3 filler alloy

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