Review of Heat Exchanger Studies for High-Efficiency Gas Turbines

Jeong, Ji Hwan; Kim, Lae Sung; Lee, Jae Keun; Ha, Man Yeong; Kim, Kui-Soon; Ahn, Young Cheol

doi:10.1115/gt2007-28071

Cited by 21 publications

(8 citation statements)

References 13 publications

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“…Cooling headways, on the other hand, have virtually raised this value to the point where turbine area gas temperature has increased. The design of the combination grain in the single priceless stone edge has played a crucial ongoing role, allowing the material's adaptive characteristics to be managed even more eagerly [15].…”

Section: Innovative Machinery Used In Gas Turbine Blade Materialsmentioning

confidence: 99%

Sustainable Approach of Innovative Wind Turbine Maintenance Using Biohydrogen Fuel Produced from Microalgae

Saini,

Mishra,

Sinha

2023

JENRR

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This abstract provides an overview of the sustainable approach to innovative wind turbine maintenance using hydrogen fuel. As the world transitions towards cleaner and more sustainable energy sources, wind power has emerged as a crucial component of the renewable energy landscape. Wind turbines are key assets in generating this clean energy, and their efficient maintenance is paramount to ensure their long-term viability and performance. This abstract highlights the concept of utilizing hydrogen as a sustainable solution for wind turbine maintenance, addressing issues related to energy storage, transportation, and environmental impact. The adoption of hydrogen as a maintenance fuel is explored in the context of its environmental benefits, cost-effectiveness, and technical feasibility. The abstract emphasizes the potential for reducing greenhouse gas emissions and enhancing the sustainability of wind energy systems through innovative hydrogen-based maintenance practices. This research initiative aims to bridge the gap between renewable energy generation and sustainable maintenance methods, offering a promising path towards a cleaner and more eco-friendly future.

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Section: Innovative Machinery Used In Gas Turbine Blade Materialsmentioning

confidence: 99%

Sustainable Approach of Innovative Wind Turbine Maintenance Using Biohydrogen Fuel Produced from Microalgae

Saini,

Mishra,

Sinha

2023

JENRR

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“…Thus, the overall cycle would consequently increase in size, along with its complexity [16]. Furthermore, gas turbines with intercooled systems can be found in aero-engines (e.g., General Electric LMS 100) [17], mid-land engines (e.g., Siemens SGT-A65) [18], and marine engines (e.g., Westinghouse and Rolls-Royce WR-21) [19]. Figure 2 shows the gas turbine engines of the three previous examples.…”

Section: Gas Turbines Intercooled System and Their Designsmentioning

confidence: 99%

Gas Turbine Intercoolers: Introducing Nanofluids—A Mini-Review

Alsayegh

Ali

2020

Processes

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Coolant is one of the main factors affecting the overall thermal performance of the intercooler for the gas turbine intercooled cycle. The thermal conductivity of conventional coolants, such as water, is relatively low when compared to solid conducting materials, and therefore can hinder the progress towards achieving a compact and highly effective intercooler. Nanofluids are advanced types of working fluids that contain dispersed nanoparticles in conventional basefluids, and as such possess superior thermal conductivity compared to their counterparts. In this paper, a short review on the effect of different nanofluids on the thermal performance of gas turbines intercoolers is presented for the first time. Firstly, this work reviews the different designs of intercoolers used in gas turbines intercooled cycles. Then, it explains the different types of nanofluids and their fabrication processes. The effective parameters, such as physical stability, thermal conductivity, and viscosity are also highlighted and discussed. Furthermore, the level of enhancement in the performance of intercoolers utilizing nanofluids is demonstrated and evaluated. Lastly, the current challenges and future research directions in this field are provided.

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“…Heat exchangers are one of the key components for environmentally friendly gasturbine engines with lower emissions and higher specific fuel consumption ratings to meet environmental requirements and airline operation conditions [1][2][3][4][5]. Advanced heat exchangers for aero-turbine applications require compact and complicated shapes to achieve high efficiency and size limitations.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Variability of Alloy 625 Thin-Tube Brazed Specimens

Lee

Kim

Park

et al. 2021

Metals

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As an advanced heat exchanger for aero-turbine applications, a tubular-type heat exchanger was developed. To ensure the optimum performance of the heat exchanger, it is necessary to assess the structural integrity of the tubes, considering the assembly processes such as brazing. In this study, fatigue tests at room temperature and 1000 K were performed for 0.135 mm-thick alloy 625 tubes (outer diameter of 1.5 mm), which were brazed to the grip of the fatigue specimen. The variability in fatigue life was investigated by analyzing the locations of the fatigue failure, fracture surfaces, and microstructures of the brazed joint and tube. At room temperature, the specimens failed near the brazed joint for high σmax values, while both brazed joint failure and tube side failure were observed for low σmax values. The largest variability in fatigue life under the same test conditions was found when one specimen failed in the brazed joint, while the other specimen failed in the middle of the tube. The specimen with brazed joint failure showed multiple crack initiations circumferentially near the surface of the filler metal layer and growth of cracks in the tube, resulting in a short fatigue life. At 1000 K, all the specimens exhibited failure in the middle of the tube. In this case, the short-life specimen showed crack initiation and growth along the grains with large through thickness in addition to multiple crack initiations at the carbides inside the tube. The results suggest that the variability in the fatigue life of the alloy 625 thin-tube brazed specimen is affected by the presence of the brazed joint, as well as the spatial distribution of the grain size and carbides.

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Review of Heat Exchanger Studies for High-Efficiency Gas Turbines

Cited by 21 publications

References 13 publications

Sustainable Approach of Innovative Wind Turbine Maintenance Using Biohydrogen Fuel Produced from Microalgae

Sustainable Approach of Innovative Wind Turbine Maintenance Using Biohydrogen Fuel Produced from Microalgae

Gas Turbine Intercoolers: Introducing Nanofluids—A Mini-Review

Fatigue Variability of Alloy 625 Thin-Tube Brazed Specimens

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