Assessment of the prevalence of harmful habit of smoking among students of medical college

The article considers the results of monitoring the opinions of medical college students concerning the issues of different types of smoking: tobacco cigarettes, hookahs, e-cigarettes and vaping.В статье рассмотрены результаты мониторинга мнения учащихся медицинского колледжа, касающихся вопросов о различных видах курения: табачных сигарет, кальянов, электронных сигарет и вейпинге

Technology of low-emission fuel combustion and conceptual structure of the combustion chamber of a gas-turbine power plant

Currently, the priority for improvement of the combustion chambers of aircraft gas turbine engines and ground-based gas turbine plants is associated with a decrease in the concentration of harmful substances in the exhaust gases while ensuring fuel economy and operational efficiency. Pride of place in the design of a gas turbine power plant goes to solving the problem of organizing the combustion process, i.e. the development of a low-emission combustion system that provides high efficiency and environmental safety. Thus, ecology today determines not only the appearance of a combustion chamber, but also that of a gas turbine power plant as a whole. Below, an attempt is made to summarize the results of developing a low-emission combustion system for various types of combustion chambers of convertible gas turbine power plants and to present a unified approach to the problem of designing a conceptual structure of a low-emission combustion chamber

New technologies implemented in the design of a low-emission combustion chamber of a gas-turbine unit

Metallist-Samara JSC has developed a fundamentally new design of a unified double-circuit burner of a low-emission combustion chamber (LECC) of a ground-based gas turbine unit (GTU), adapted for manufacturing with the help of an innovative technology by selective laser melting (SLM) of metal powders using CAD models. Several batches of burners were made and control studies were carried out characterizing the quality of manufacturing according to the established procedure. Deficiencies inherent in the SLM process were discovered, the main of which are: raised roughness, in particular, of the fuel channels of the main and duty zones; microporosity, microalloying; microcracks; instability of flow characteristics; local non-sintering zones of the layers grown on the burner body. As a result of the analysis of the state of the manufactured burners, research and refinements, it was found that most of the identified shortcomings can be eliminated during further development of the modes and parameters of the technological process. Currently, difficult engineering problems associated with the implementation of additive manufacturing technologies have been overcome