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Information × Registration Number 0225U001720, (0124U002500) , R & D reports Title Theoretical and experimental studies of the interaction of gas-water flows with a curved surface popup.stage_title Аналіз сучасного стану та розробка методики проведення теоретико-експериментальних досліджень взаємодії газо-водяних течій з криволінійною поверхнею. Оцінка впливу фізичних характеристик газо-водяних течій та геометричних параметрів криволінійної поверхні на їх взаємодію. Head Moroz Volodymyr V., Кандидат технічних наук Registration Date 05-02-2025 Organization The Institute of Hydromechanics of the National Academy of Sciences of Ukraine popup.description1 The purpose of the research is to establish the interaction of the gas-water flow with curved surfaces. At the same time, gas-water currents can be both surface and in the water column, and curved surfaces can be both concave and conve popup.description2  An analysis of the results of theoretical and experimental studies of the interaction of gas-water flows with curved surfaces was conducted using open sources. The vast majority of works are related to the problem of reducing the hydrodynamic resistance of the hulls of objects moving in water, in particular, the friction force. The results of theoretical and experimental studies are known, in which the physical characteristics of the fluid in the boundary layer are changed, in particular by injecting gas bubbles into the boundary layer. Today, the most commonly used step theory of the turbulent boundary layer is used to study gas-water flows, according to which it is believed that near the surface of the vessel hull the flow has a density and viscosity lower than the density and viscosity in an undisturbed flow. The results of theoretical and experimental studies are known, in which a reduction in friction force by 80% was achieved on flat surfaces. The advantages and disadvantages of known methods of generating gas bubbles in the boundary layer are considered, in particular, using a porous surface, micro-features on the surface (holes, protrusions), a jet ejector, etc. The vast majority of these methods have not found application in shipbuilding practice due to complex technological difficulties. It is noted that a significant part of modern high-speed vessels moves in transitional and planing modes, which are accompanied by intensive wave formation and spray in the bow. Currently, hydrodynamic ship schemes are actively developing, in which the energy of bow waves is utilized and the spray is retained under the ship's hull. To maintain the gas-water flow under the ship's hull, the lower part of the hull is given a tunnel-like shape, and there may be several tunnels. Product Description popup.authors Babenko Viktor V. popup.nrat_date 2025-02-05 Close