Improving internal cooling performance of turbine blade with steam in channel with rhombus-patterned biomimetic ribs: A numerical investigation

Xing, Jiangjiang; Han, Shaohua; Song, Yuanyuan; An, Na; Zhou, Leping; Li, Li; Zhang, Hui; Du, Xiaoze

doi:10.1016/j.tsep.2023.101789

Cited by 8 publications

(4 citation statements)

References 34 publications

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“…The results revealed that IMCHS with ribs significantly increased local heat transfer and friction performance on the windward side of the ribs, which proved that IMCHS with ribs could enhance the heat dissipation. Xing et al [33] designed discrete rib structures on the basis of bionic sharkskin scales with a rhombusshaped pattern inside the channel for gas turbine, as shown in Figure 6b. For steam and air-cooling systems, decreasing the height of the bionic ribbed channel consistently displayed the best performance.…”

Section: Surface Featuresmentioning

confidence: 99%

“…Figure 6. (a) Interrupted microchannel heat sink with four interrupted shape ribs; (b) detailed rib structures; (c) two-pass channel and a square rib, a-quarter-cylinder rib, and a petal-shaped rib;(d) microchannels with different configurations; (e) schematic of (i) a battery thermal management system based on a V-shaped rib cold plate, (ii) a cold plate with a rectangular flow channel, and (iii) a rectangular flow channel with a straight rib and V-shaped ribs[32][33][34][35][36].…”

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confidence: 99%

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Recent Development of Heat Sink and Related Design Methods

Li,

Yang

2023

Energies

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Heat sinks are vital components that dissipate thermal energy from high temperature systems, such as aero-space vehicles, electronic chips, and turbine engines. In the last few decades, considerable research efforts have been devoted to heat sinks to enhance heat dissipation, minimize temperature in the hot spot region, and reduce the temperature of hot section components. At present, the improvement of the thermal performance of heat sinks encounters many bottlenecks and demands the implementation of new designs, new materials, and flexible manufacturing. This study summarized the recent development of heat sinks over five years with a major review of heat transfer aspects, i.e., conduction, convection, radiation, phase change, and nanofluids technology, as well as perspectives in the aspect of structural design. The purpose of this work is to provide an overview of the existing studies that elevate the thermal performance of heat sinks and propose prospectives and suggestions for future studies.

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Section: Surface Featuresmentioning

confidence: 99%

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confidence: 99%

Recent Development of Heat Sink and Related Design Methods

Li,

Yang

2023

Energies

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“…The latest literature, such as Refs. [30][31][32] proved that steam can greatly increase Nusselt number when compared to air; steam can not only provide a high heat transfer rate but also have the effect of slowing down the oxidation phenomenon, which means the steam cooling method can raise the structural strength of the metal cooling channel; in the solar heater area, the steam production process raising an interfacial evaporation effect can greatly enhance photovoltaic and thermoelectric performance. Therefore, it's very worthwhile to conduct in-depth research on steam cooling structures.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Steam Cooling Characteristics in a Isosceles Trapezoidal Channel with Pin-Fin Arrays at Turbine Blade Trailing Edge

Xi,

Gao,

Ruan

et al. 2024

Energies

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Using the SST k-ω turbulence model, a comprehensive numerical investigation was conducted to analyze the flow and heat transfer characteristics of steam within an isosceles trapezoidal cooling channel with pin-fin arrays modeled from the trailing edge of a F-class gas turbine high-temperature blade. The influence laws of various parameters, including the Reynolds number (Re, from 10,000 to 50,000), dimensionless pin-fin diameter (d/H, from 0.4 to 0.8), and dimensionless pin-fin spacing (S/H, from 1.6 to 2.4), on the flow and heat transfer performance of the isosceles trapezoidal cooling channel with pin-fin arrays were examined. Sensitivity analysis was employed to determine the relative significance of these influence parameters on the cooling performance of the isosceles trapezoidal channel with pin-fin arrays. Finally, the corresponding heat transfer and friction correlations within the investigated parameter range were developed. The research findings reveal that under different Reynolds numbers, as the dimensionless pin-fin diameter increases from 0.4 to 0.8, the friction factor within the isosceles trapezoidal cooling channel with pin-fin arrays increases by a factor of 3.25 to 3.41, while the overall average Nusselt number improves by 31.05% to 37.41%. Conversely, when the dimensionless pin-fin spacing increases from 1.6 to 2.4, the friction factor within the isosceles trapezoidal cooling channel with pin-fin arrays decreases by 67.38% to 69.18%, accompanied by a reduction in the overall average Nusselt number by 24.95% to 31.14%. When both the flow performance and heat transfer performance are taken into account, the importance of the influence parameters ranks as follows: Reynolds number, pin-fin diameter, and pin-fin spacing. It also suggests that smaller pin-fin diameters and larger pin-fin spacing should be selected in the design stage based on the variation laws of integrated thermal-hydraulic performance. The results may provide valuable references and insights for the design of steam cooling structures within high-temperature turbine blade trailing edge channels in advanced gas turbines.

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“…In addition, in the cooling of turbine blades at high temperatures, steam has better advantages over air due to its better heat transfer properties [18,19]. Xing et al [20] showed that better internal cooling performance of gas turbine blade can be obtained using steam cooling compared to air cooling. Najjar et al [21] comparatively studied the cooling performance of blades under three cooling schemes (open-circuit steam, air and closed-circuit steam cooling) and showed that steam cooling has higher cooling efficiency compared to air cooling.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Cooling Performance of a Steam-Cooled Blade Based on Response Surface Method

Zhao

Gao

et al. 2023

Applied Sciences

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In order to investigate the cooling mechanism of the turbine blade and to enrich and supplement the experimental study of the blade, a numerical study of a steam-cooled blade with five cooling channels was carried out based on the response surface model. The surface cooling efficiency and dimensionless temperature distribution of the steam-cooled blade were obtained with different mainstream inlet temperature, outlet pressure, pressure ratio of inlet to outlet, temperature ratio and flow ratio of steam to mainstream by using the flow-solid coupling numerical method. The influence of the working parameters on the cooling performance of air-cooled blade and steam-cooled blade, including the average cooling efficiency, temperature non-uniformity, and average dimensionless temperature, was comparatively investigated; the correlation equation of the working parameters on the cooling performance of the steam-cooled blade was obtained. The results show that the influence of mainstream inlet temperature and outlet pressure on the cooling performance of the steam-cooled blade is not significant; the cooling efficiency of the steam-cooled blade increases by 5.92%, 7.35% and 26.51% respectively as the mainstream inlet to outlet pressure ratio, the temperature ratio and the flow ratio of steam to mainstream increase; the dimensionless temperature increases by 3.74% as the temperature ratio increases and decreases by 0.93% and 4.09% as mainstream inlet to outlet pressure ratio and flow ratio increase; the temperature non-uniformity decreases by 4.09% and 30.08% respectively, as the mainstream inlet to outlet pressure ratio and temperature ratio increase and increases by 37.99% as the flow ratio increases; the effect of working parameters on air-cooled blade and steam-cooled blade is the same, but the steam-cooled blade has 14.06–17.81% higher cooling efficiency, 18.47–29.01% higher temperature non-uniformity and 1.86–2.58% lower dimensionless temperature compared to the air-cooled blade under the same working parameters; the correlation equation obtained by fitting the response surface model has higher accuracy.

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Improving internal cooling performance of turbine blade with steam in channel with rhombus-patterned biomimetic ribs: A numerical investigation

Cited by 8 publications

References 34 publications

Recent Development of Heat Sink and Related Design Methods

Recent Development of Heat Sink and Related Design Methods

Numerical Study on Steam Cooling Characteristics in a Isosceles Trapezoidal Channel with Pin-Fin Arrays at Turbine Blade Trailing Edge

Numerical Study on Cooling Performance of a Steam-Cooled Blade Based on Response Surface Method

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