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    Wyświetlanie 1-4 z 4
    Tytuł:
    Impact of work of turbine adaptive engines for the natural environment
    Autorzy:
    Ćwik, D.
    Kowalski, M.
    Steżycki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/246614.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    noise of aircraft engines
    environmental impact
    jet engine turbine
    emission of toxic compounds
    aircraft engines
    turbine jet engine
    Opis:
    The article describes the problem of the operation of turbine jet, adaptive engine work on the natural environment. In particular, the analysis of noise generated by turbine jet engines has been made. It points out possible directions of noise decrease with particular emphasis upon structural changes within the engines, the task of which is to reduce the noise mission. The example of the modernization is based upon the “bypass” type of one-flow turbine jet engine. The essay contains theoretical basis of calculation of the noise emission level and the results, which graphically indicate a relative level of noise of this type of engine depending upon the amount of discharged air and the diameter of the discharge nozzle and the radius, upon the basis of which the noise level is determined. This work also includes a comparison of the relative noise level of this type of engine with regard to one-flow turbine engine equipped with the function of air discharge to the environment and with regard to two-flow turbine jet engine equipped with air stream flow mixing device. The use of low-emission combustion chambers in the "bypass" turbine engine was indicated. This allowed addressing the problem of emissions of toxic exhaust components by this type of aircraft engines. At the same time, the dependence of this emission related to the mass of fuel used on the engine's thrust range was indicated. The article was concluded with a short summary.
    Źródło:
    Journal of KONES; 2018, 25, 4; 509-516
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Advantages of compressor downstream air partial bleed and supplying it downstream of the turbine in a turbojet engine
    Autorzy:
    Ćwik, D.
    Kowalski, M.
    Stężycki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/247092.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    aviation engine operating parameters
    jet engine designs
    aviation engine air bleed
    Opis:
    The research article discusses the advantages of using compressor downstream air partial bleed and supplying it downstream of the turbine, which was applied in a prototype of a “bypass” turbojet engine. The objective of such a turbo engine structural solution was discussed along with its elements and principle of operation. Further part of the article determines the impact of such partial air bleed on the value of achieved basic operating parameters of the engine, i.e., unit thrust and unit power consumption. The presented attempt to compare these parameters with the parameters achieved for a turbojet, single flow engine is very important; in the first case without air bleed, and in the second, with air bleed to the environment. Further sections of the article compared these parameters relative to a turbojet, turbofan engine with a jet mixer. Such comparisons enabled to determine the actual benefits of using compressor downstream air partial bleed and supplying it downstream of the turbine, which may constitute an intermediate solution between single flow turbine engines and turbo fan engines. Wide possibilities for the application of such structural solutions were shown, which was summarised in the conclusions.
    Źródło:
    Journal of KONES; 2018, 25, 4; 501-508
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative study between Poland and South Africa wind climates, the related damage and implications of adopting the eurocode for wind action on buildings
    Autorzy:
    Goliger, A.
    Żurański, J.
    Giżejowski, M.
    Gaczek, M.
    Retief, J.
    Kruger, A.
    Dunaiski, P.
    Fiszer, S.
    Ćwik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/231003.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    warunki wiatrowe
    szkoda wiatrowa
    obciążenie wiatrem
    projektowanie konstrukcji
    norma
    wind climate
    wind damage
    wind loading
    structural design
    standard
    Opis:
    Wind constitutes one of the major environmental factors affecting the design and performance of built environment. Each country has its unique climatic wind conditions, and the way in which these are considered and implemented in the structural design, is important. An implementation or adoption of any new engineering design stipulations introduces a formidable challenge to the developers of the standards and the design profession. This has been experienced in some of the countries (e.g. the UK, Australia and the USA), where processes of modernising the outdated codification took place in the past. Although both Poland and South Africa are currently at the early implementation stage of the new wind loading design stipulations, there is a major difference between the circumstances of the two countries. Poland, as an EU member state, has a compulsory obligation to adopt the new uniform standarisation requirements, within a stipulated time-frame. The South African code developers, after a thorough investigation process which will be highlighted in the paper, decided voluntarily to adopt the Eurocode as the primary model document.
    Źródło:
    Archives of Civil Engineering; 2013, 59, 1; 51-95
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Insulinoma – diagnosis and treatment based on case description
    Autorzy:
    Przybylska, A.
    Lachowska-Kotowska, P.
    Sypianska, M.
    Kondziela, D.
    Czop, K.
    Cwik, G.
    Sierocka-Sawa, J.
    Prystupa, A.
    Mosiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/3100.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Journal of Pre-Clinical and Clinical Research; 2012, 06, 1
    1898-2395
    Pojawia się w:
    Journal of Pre-Clinical and Clinical Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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