Mechanical Engineering, Renewable Energy, Sustainability and the Environment, Engineering, Transportation
13
Scopus Publications
Scopus Publications
Thermodynamic and electrochemical analysis of petrol-hydrogen blends for emission reduction in Otto engines Jumaniyez Ismatov, Javlon Djalilov, Jamshid Khakimov, Zakirjan Musabekov, Abdukhalil Ismatov, Ikromjon Avazov Proceedings of SPIE the International Society for Optical Engineering, 2026 The article presents a theoretical analysis of electrochemical processes occurring during water electrolysis, allowing for the selection of a rational electrolyte composition and the mode of obtaining explosive gas. The Otto thermodynamic cycle demonstrates the fundamentals of volumetric fuel combustion and the importance of its role in the release of hydrogen and oxygen ions. The article considers the assessment of the activation level of the gasoline-hydrogen fuel mixture by increasing the activation energy of the combustion process of the cycle, the development of analytical dependencies, and the theoretical justification of the composition of the gasoline-hydrogen fuel mixture, ensuring efficient combustion in a wide range of speed and load modes of the F16D3 passenger car engine. The electrolysis mechanism, the electrolyte ions in aqueous solutions, and the processes that occur in them were studied.
Climate risk assessment in Uzbekistan: surface air temperature anomaly for 2080-2099 Umidkhon Uzbekov, Aybek Arifjanov, Obidjon Ergashev, Feruza Khamroeva, Ibrokhim Bekkulov, Yunus Karimov, Jumaniyoz Ismatov E3s Web of Conferences, 2024 This study presents a detailed analysis of projected surface air temperature anomalies in Uzbekistan for the late 21st century (2080-2099), utilizing a multi-model ensemble under the high emission scenario SSP5-8.5. Our findings indicate a significant warming trend across the country, with average mean surface air temperature anomalies expected to range from +4.5°C to +4.7°C compared to two historical reference periods (1995-2014 and 1950-2014). These projections suggest profound implications for Uzbekistan’s water resources, agricultural productivity, and overall ecosystem health, highlighting the urgency of developing robust adaptation and mitigation strategies. The study underscores the importance of enhancing water use efficiency, adopting climate-resilient agricultural practices, and investing in sustainable infrastructure to combat the anticipated impacts of climate change. Additionally, it calls for collaborative efforts in policy-making, research, and community engagement to build resilience against the projected warming. The results emphasize the need for immediate action to safeguard Uzbekistan against the exacerbating effects of climate change, advocating for integrated approaches to climate resilience and sustainability. This research contributes to the broader understanding of regional climate dynamics under future emission scenarios, providing a foundation for targeted climate action in Central Asia.
Provision of carbon-free emission of exhaust gases on vehicles Jumaniyoz Ismatov, Farhod Matmurodov, Mirgani Fayziev, Javlon Djalilov E3s Web of Conferences, 2023 The paper analyzes foreign and domestic research on reducing emissions of harmful substances and greenhouse gases from exhaust gases. The provision of carbon-free emissions of exhaust gases in motor vehicles has been studied. Ways for further research on environmental safety and energy efficiency of vehicles are given.
Evaluation of the efficiency of thermal insulation of the combustion chamber according to the load characteristics of a diesel engine Jumaniyoz Ismatov, Jamshid Khakimov, Saydulla Kalauov, Abduxalil Ismatov Iop Conference Series Earth and Environmental Science, 2023 Prospects for the development of diesel engine building are seen in a consistent increase in specific indicators due to forcing on the average effective pressure with a simultaneous decrease in the loss of fuel combustion heat, thermal insulation of the combustion chamber and the use of exhaust gas energy. All these measures are taken to bring the real thermodynamic cycle closer to the theoretical adiabatic cycle. This explains the appearance of the terms adiabatic, semiadiabatic, partially adiabatic, and even superadiabatic. The existing estimates of the effectiveness of thermal insulation of diesel combustion chambers in terms of the level of adiabatization of the thermodynamic cycle were based on qualitative rather than quantitative indicators, as a result of which the achieved effects were interpreted by various researchers ambiguously. The introduction of uniformity in the methods, indicators and quantitative criteria for evaluating the efficiency of using the heat of combustion of fuel in the working cycle of a diesel engine makes it possible to determine not only the achieved level, but also to predict the future development of the engine building industry, which confirms the relevance of the problem.
Operating indicators in diesels with reduced heat and energy losses J Ismatov, M Aripdjanov, J Mirzaabdullaev, R Tillahodjaev, A Mirzaev, H Viarshyna Iop Conference Series Earth and Environmental Science, 2023 The foregoing explains the experimentally established fact that in a heat-insulated diesel engine, diffusion combustion is of great importance - both in terms of the share of heat release and the duration of combustion. To compensate for the decrease in the efficiency of a thermally insulated diesel engine due to an increase in the duration of combustion, the injection advance is increased. The economic effect achieved in this way by increasing the maximum cylinder pressure cannot be considered due to thermal insulation. For typical compression end temperatures in a thermally insulated diesel engine, diffusion combustion, especially in the near-wall layers, is limited by transfer processes. This fact, in addition to the need to eliminate re-enriched zones in the near-wall layers, urgently requires additional turbulization of the working fluid during mixture formation and combustion in thermally insulated engines. The difficulty in solving this problem lies in the fact that one of the most important turbulence generators is the intake process, and one of the most effective solutions is special intake channels. However, the averaged motion and turbulence in the combustor decay significantly during compression. This process is enhanced in a thermally insulated diesel engine due to an increase in the molecular viscosity of the air. The same applies to the generation of turbulence at the end of compression-beginning of expansion. Thus, turbulization of the charge in the combustion chamber of a thermally insulated diesel engine is an urgent problem.
Analytical modeling of mass transfer dynamics, velocity, heat transfer and enthalpy in a gas-liquid combustible mixture J F Ismatov, F M Matmurodov, J O Khakimov, J X Djalilov Iop Conference Series Earth and Environmental Science, 2022 The article studied the distribution of the droplet and temperature over the volume of the combustion chamber when liquid fuel was injected into it. The study showed that the portable mass in the combustion chambers and temperatures are directly proportional. Compiled systems of dynamic equations describing mass transfer, motion, heat transfer and enthalpy at the beginning inside the chamber phase and during combustion inside the chamber. Mathematically modeled a gasoline-hydrogen-air mixture with the mass transfer method. With this simulation, pressures are determined at the beginning inside the chamber phase and during combustion inside the chamber, taking into account the newly introduced enthalpy coefficient of gas kHg and steam kHp phase media.
Description by the method of combustion mass transfer of a gasoline-hydrogen-air mixture and reduction of harm to the environment J Ismatov, F Matmurodov, A Kholikov, A Abdullaev, J Djalilov, U Muhammadiyev Journal of Physics Conference Series, 2021 The prospects for the use of hydrogen in automobile engines have been studied, it is possible to summarize, first of all, in relation to environmental friendliness, renewable and unlimited raw materials and the unique characteristics of the engine, which allows the use of hydrogen without making fundamental changes in modern engines. The norms for the emission of harmful substances into the environment are given and ways to reduce the emission of these harmful substances are shown. The schematic diagrams of the hydrogen electrolyzer are developed and the transfer of hydrogen to the combustion chambers is indicated. The paper describes the combustion process of a gasoline-hydrogen-air mixture using the mass transfer method.
Ensuring safety in gas mine development I I Shamsutdinova, N V Vadulina, A O Salimov, A I Ponomoraev, J F Ismatov Iop Conference Series Earth and Environmental Science, 2021
