Structure Optimization of Steam Turbine Cascade considering the Non-Equilibrium Condensation using Machine Learning Method

Energy, Journal Year: 2025, Volume and Issue: unknown, P. 135305 - 135305

Published: Feb. 1, 2025

Language: Английский

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Numerical investigation of superheating secondary flow on performance of steam ejector by considering non-equilibrium condensation in renewable refrigeration cycle

Chemical Product and Process Modeling, Journal Year: 2025, Volume and Issue: unknown

Published: March 8, 2025

Abstract The escalating global concern over climate change and the urgent need for sustainable solutions have propelled renewable energy technologies into spotlight. Among these, refrigeration cycles emerged as a promising research area, offering environmentally friendly alternatives to traditional systems. Ejector (ERCs), particularly those employing water working fluid, garnered significant attention due their inherent advantages. To further optimize performance of ERCs, comprehensive understanding underlying flow phenomena impact on system efficiency is crucial. primary objective explore secondary superheating ejector’s characteristics. A parametric study conducted by varying degree from 0 K 30 while maintaining constant pressures 1,200 Pa 1,800 Pa. results revealed that overall pattern remained relatively unaffected increase in superheating, exergy destruction were significantly impacted. noteworthy observation inverse relationship between entrainment ratio. As increases, ratio exhibits corresponding decrease. For instance, 30-degree superheat resulted 2.8 % 3.9 reduction at Pa, respectively.

Language: Английский

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Progress in the research on non-equilibrium condensation of the compressor in the supercritical CO2 closed Brayton cycle system

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(4)

Published: April 1, 2025

The supercritical carbon dioxide (S-CO2) closed Brayton cycle holds significant promise for revolutionizing the future of efficient and comprehensive new energy utilization. However, compressor operation in this is characterized by rapid pressurization, which induces substantial fluctuations temperature pressure, potentially triggering non-equilibrium condensation S-CO2. This phenomenon disrupts flow field within compressor, thereby decreasing overall performance system. Therefore, exploring mechanism great significance improving work summarizes various improvement types S-CO2 systems engineering applications across fields. Subsequently, it reviews development theories compressors, focusing on nucleation growth models. In addition, current research status characteristics under high-speed high-pressure conditions summarized, based convergent-divergent nozzle experiments simulations. systematically progress system from perspectives, such as origin technological bottleneck, nature scientific problem, state research. By reviewing blade humidity control method condensation, proposed that technology active multi-objective coordination should be direction further findings analysis can provide a reference design blades

Language: Английский

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Machine learning-based multi-objective optimization of a carbon dioxide direct-expansion geothermal heat pump comprising an internal heat exchanger and expander

Applied Thermal Engineering, Journal Year: 2025, Volume and Issue: unknown, P. 126699 - 126699

Published: May 1, 2025

Language: Английский

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Prediction of condensation shock in supersonic nozzle: Comparison between high-pressure and low-pressure conditions at different of superheating degree

Chemical Engineering Science, Journal Year: 2025, Volume and Issue: unknown, P. 121818 - 121818

Published: May 1, 2025

Language: Английский

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