Статті КЕТтаОП (ДМетІ)

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    Rocket Engine Vacuum Nozzle 3D Printing: Manufacturing, Weight, and Cost Savings
    (MDPI AG, Basel, Switzerland, 2025) Alexopoulos, Nikolaos D.; Zeimpekis, Vasileios; Vasileiou, Evangelos; Thomaidis, Nikolaos; Souxes, Theodoros; Lazaridou, Ilona; Lutsyk, Maksym; Vorobev, Roman; Karakash, Evgeniy; Karpovich, Elena; Grydin, Olexandr
    ENG: Metallic materials additive manufacturing is extremely challenging nowadays, while aircraft manufacturers are trying to adapt the newly developed technology to produce parts of complex geometry with minimum materials losses. Skyrora is a company focused on the production of several launch vehicles and rockets with the aim of becoming a commercial provider for access to space. One of the Skyrora goals is to develop innovative and long-term solutions for future growth, and, within the Horizon European project “MADE-3D”, aims to improve the rocket propulsion system of the launch vehicle Skyrora XL by exploiting multi-materials during the production phase by additive manufacturing. The main goal of the present investigation is to document the already existing production phases of the “conventional” Skyrora vacuum nozzle printed with Inconel 718 to provide a baseline in terms of weight, manufacturing cost, lead processing time and CO2 equivalent emissions of the under-development multi-material demonstrator.
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    Synergy of Secondary Energy Resource Utilization and Hydrogen Technology for Reducing the Carbon Footprint of Industrial Thermal Units
    (IOP Publishing Ltd, 2026) Kolienko, Anatoliy G.; Gupalo, Olena V.; Akhmednabiev, Rasul M.
    ENG: The article presents research results focused on improving energy efficiency and reducing the carbon footprint during pellet burning in rotary kilns. The study includes experimental kiln production, development of its energy balance, analysis of energy loss components, assessment of renewable and non-renewable energy losses, and determination of greenhouse gas emissions. The influence of operating parameters on kiln efficiency was examined, and their optimal values were identified. The thermal potential of secondary energy resources at the pellet burning plant was evaluated. A waste-heat utilization scheme for municipal and domestic heating and hot water supply was proposed. The study also establishes dependencies demonstrating the potential for reducing CO2 emissions when substituting natural gas with a mixture containing reducing hydrogen. Research results on lowering the carbon footprint by burning environmentally neutral biomass are presented, along with practical recommendations. The scientific and applied outcomes of the work enable the development of measures aimed at decarbonization and enhancing the efficiency of rotary kilns used for pellet burning in mining and metallurgical enterprises.