Browsing by Author "Vovk, Oksana"

Now showing 1 - 8 of 8
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    COMPARATIVE ANALYSIS OF STANDARD TESTING METHODS FOR MEASURING FUELS & LUBRICANTS BIODEGRADATION
    (Національний авіаційний університет, 2015) Boichenko, Sergii; Vovk, Oksana; Iakovlieva, Anna; Kumeiko, Sofia
    Biodegradation in fresh water of materials such as plastics, lubricants, and other chemicals, which might end up in the environment after use, is of great importance. Therefore, certification of bio-based materials that may end up as waste in fresh water, with respect to their biodegradation behavior, is necessary. Standard testing methods for measuring biodegradation in fresh water are described in OECD guidelines, ASTM standards, ISO standards, etc. The most widely used testing methods for evaluating biodegradation of chemicals in aerobic aqueous medium are OECD 301 and OECD 310 for ready, and OECD 302 for inherent biodegradability, respectively. Similarly, the International standards ISO 7827, ISO 9408, ISO 9439, ISO 10707, ISO 10708, and ISO 14593 determine the biodegradability of organic compounds in an aerobic aqueous environment and are equivalent to OECD 301 and OECD 310. Test methods comparable to OECD 302 (inherent biodegradability) were also developed at ISO level (ISO 9887, ISO 9888). The American Standards ASTM D 5271 (plastics) and ASTM D 5864, ASTM D 6139 and ASTM D 6731 (lubricants) address the biodegradability of final products which are soluble, poorly soluble, or insoluble in water. Despite the availability of various testing methods for determining biodegradability in fresh water, further research is necessary for identifying the key factors affecting the accuracy and reproducibility of the results. Moreover, the corresponding specifications to characterize the biodegradability of bio-based complex materials in fresh water need to be further investigated
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    Comparative characteristics of low-temperature properties of jet fuels modified with bio-additives
    (IOP Conf. Series: Materials Science and Engineering 421, 032003, 2018, 2018) Boichenko, Sergii; Lejda, Kazimierz; Yakovlieva, Anna; Vovk, Oksana
    The work is devoted to the investigation of low-temperature properties of alternative jet fuels mixed with bio-additives derived from rapeseed oil, methanol and ethanol. For this work, a modification of conventional jet fuel from rapeseed oil, methanol and ethanol was chosen to develop alternative jet fuels. The main low-temperature characteristics – freezing point and pour point of conventional jet fuel and three types of bio-additives were identified and compared with the requirements for conventional Jet A-1 fuel. The influence of bio-additives from rapeseed oil, methanol and ethanol on low-temperature characteristics of new jet fuels has been studied and explained. The necessity of studying new technologies is grounded.
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    Development of alternative jet fuels modified with camelina oil bio-additives
    (National Aviation University, 2019) Iakovlieva, Anna; Boichenko, Sergii; Lejda, Kazimierz; Kuszewski, Hubert; Vovk, Oksana
    This paper is devoted to the development and study of physical-chemical and exploitation properties of new alternative jet fuels modified with camelina oil bio-additives. The current condition of environment is analyzed as well as the impact of aviation industry on the environment. During the study the following physical-chemical properties were investigated: density, viscosity, fractional composition, heat of combustion, lubricity, corrosiveness and freezing point. It was found that properties of bio-additives are significantly different from properties of jet fuels. As a result of the work, the complex comparative characteristic of physical-chemical and exploitation properties and quality parameters of jet fuel, camelina oil bio-additive and blended jet fuel samples, was developed.
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    Experimental study on antiwear properties for blends of jet fuel with bio-components derived from rapeseed oil
    (2015-11) Iakovlieva, Anna; Boichenko, Sergii; Vovk, Oksana; Lejda, Kazimierz; Kuszewski, Hubert; Jakubowski, Miroslaw
    Antiwear properties of jet fuel, two kinds of biocomponents derived from rapeseed oil and their mixtures were investigated experimentally. Antiwear properties were estimated by the value of the scuffing load and the limiting load of scuffing applied to the friction pair working in a fuel medium. Biocomponents, mainly rapeseed oil FAME and rapeseed oil FAME modified via vacuum distillation were used during the study. It is found that lubricity of biocomponents is significantly higher comparing to conventional jet fuel. It is explained by the chemical composition of FAME: highly polarity of molecules stipulate their good adsorption at the surface of friction pair. High viscosity of biocomponents due to chemical structure positively influence on their lubricity. Adding biocomponents into jet fuel results in strengthening of boundary film and thus improves antiwear properties of fuel blends. It is determined that FAME modified via vacuum distillation possesses better lubricating ability comparing to standard FAME derived from rapeseed oil. Correlation between viscosity and lubricity of fuel is shown.
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    Fundamentals of Chemmotology
    (National Aviation University, 2019) Boichenko, Sergii; Yakovlieva, Anna; Vovk, Oksana; Radomska, Margaryta; Cherniak, Larysa; Shkilniuk, Iryna
    The manual presents a modern interpretation of Chemmotology science, its role in development of technology and society. It shows that development and promotion of alternative fuels and Chemmotology problems solving are impossible without systematic approach. In addition, having both theoretical part and practical application, Chemmotology science ensures energy and environmental security of the country's economy, rational use of traditional and alternative fuels and lubricants in operation of advanced modern equipment. The manual focuses on the fact that in recent years one of the most important issues has been the ecological constituent of Chemmotology science, which is aimed at ultra-minimization of negative impact of fuel lubricants and technical liquids on ecosystems. It is well-known that transport sector is an important component of the economy that have an impact on the development and prosperity of the population. Efficiency, reliability of operation of transport, rational use of operating materials depends on their correct selection. According to its quality performance materials must conform to both the model and operating conditions of transport means. The use of poor quality fuels and lubricants leads to a decrease in the durability and reliability of machinery and machine parts; the use of materials of higher quality than required causes unreasonable increase in costs. Thus, knowledge of the range of fuels and lubricants, its functional purpose, operational properties allow using them correctly and efficiently. The authors tried to integrate and systematize in the presented manual the knowledge of many experts from different countries to characterize main trends in the development of conventional and alternative fuels and lubricants, its modern assortment and tendencies in development.
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    IMPROVEMENT OF TECHNOLOGICAL SCHEME OF FATTY ACIDS ETHYL ESTERS PRODUCTION FOR USE AS JET FUELS BIOCOMPONENTS
    (2014-11-30) Iakovlieva, Anna; Boichenko, Sergii; Vovk, Oksana; Lejda, Kazimierz; Kuszewski, Hubert
    The world tendency in replacement of traditional jet fuels with their alternative analogues is presented. The main technologies of jet biofuels production from plant oils are described. The main requirements to biocomponents used in jet fuels are formed. Chemical composition and properties of biocomponents produced via esterification of plant oils by ethanol were investigated. It was developed a method for physical-chemical properties of biocomponents improvemet. The efficiency of the proposed method is shown.
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    Modification of jet fuels composition with renewable bio-additives
    (National aviation university, 2019) Yakovlieva, Anna; Boichenko, Sergii; Lejda, Kazimierz; Vovk, Oksana
    The study is devoted to developing of alternative jet fuel by means of blending conventional jet fuel with plant-derived bio-additives and studying properties of new alternative jet fuels. The review and systematization of the variety and classification of jet fuels used all over the world was done. The technologies of jet fuels production from various non-renewable energy sources are discussed. Factors, which stipulate development and implementation of alternative jet fuels were shown: limitation of crude-oil deposits, decreasing of its energy efficiency, global warming that is intensified by processes of extraction, processing and use of fuels and exhaust gases that negatively affect atmosphere. Perspective technologies and feedstock for alternative jet fuels production were analyzed, as well as advantages and disadvantages of each of them. Fundamentals of jet engine operation and exploitation are considered within this study. It was discussed how jet fuels quality and composition may affect the life span, reliability and durability of jet engines. The method for bio-additives production from rapeseed oil and camelina oil fatty acids esters was developed. High quality bio-additives based on FAME and FAEE of rapeseed and camelina oil were used for blending with conventional jet fuels. In the result of experimental studies the comparative characteristics of physical-chemical and exploitation properties of new alternative jet was developed. The properties of new jet fuels were considered for satisfying requirements of standards for fuels of grade Jet A-1. It was shown that maximal content of bio-additives in blended jet fuels is 30 %. In the result of bench tests it was concluded that operational parameters of the jet engine powered with new blended jet fuels completely satisfy exploitation norms, which are set in specification for tested jet engine, may be used as a working body of the jet engine and do not require its design changes. In the result of emissions evaluation it was concluded that blending conventional jet fuels with bio-additives allows improving its environmental properties: decreasing amounts of CO2, H2O, SO2 and NOx emissions in jet engine exhaust gases. The results of the study will contribute to reducing the energy dependence of air transport, improve its environmental friendliness and will promote improvement of the sustainability and safety of modern civil aviation.
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    Potential of jet biofuels production and application in Ukraine and Poland
    (Inderscience publishers, 2015) Iakovlieva, Anna; Boichenko, Sergii; Vovk, Oksana; Lejda, Kazimierz
    he present-day situation in civil aviation is discussed. Taking into account limitation of crude oil resources for jet fuel production and worsening of the ecological situation, the tendency to transition to alternative fuels is presented. The perspectives of Ukraine and Poland in production and application of alternative jet fuels is figured out. Main attention is paid to reveal possibilities of these countries for production of jet biofuels derived from plant oils. The potential of biofuels production from various feedstocks is presented and analysed. The advantages of oil-derived biofuels production and application are discussed.