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    Wyświetlanie 1-3 z 3
    Tytuł:
    The assessment of changes in the microstructure of a gas turbine blade with a non - destructive thermographic method
    Autorzy:
    Kułaszka, A.
    Błachnio, J.
    Zasada, D.
    Jóźwik, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/246861.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    gas turbine
    blade
    pulsed thermography diagnosing
    health/maintenance status
    Opis:
    Diagnostic methods applied nowadays to examine condition of a gas turbine blade have been discussed in the Introduction section. What follows in the body of the paper is presentation of findings on the assessment of changes in the microstructure of a gas turbine blade with a non-destructive thermographic method. A laboratory experiment performed on new turbine rotor blades made of the EI 867WD alloy has been described. The experiment consisted in holding the blades at different temperatures in the exhaust-gas environment produced by an aircraft engine supplied with jet fuel. The pulsed thermography method has been used to determine and analyse the temperature distribution upon the examined area while cooling-down after the earlier uniform warming it up with a heat pulse. Diffusion and effusion of heat in the alloy have been examined. Both phenomena are determined with thermal properties and other physical properties such as size, shape, weight, structure, chemical composition, thickness of the protective coating of the blade. Examination of the microstructure of the blade material has shown the increased thickness of the coating, grain size, and in particular disadvantageous modification in the strengthening gamma' phase against temperature. Finding the relationship between parameters of thermal responses of blade materials to heat pulse against the average size of precipitates of the gamma' phase and thickness of the aluminium protective coating enables inferences on changes in the blade material's condition. With this relationship as the basis and knowing permissible changes to the microstructure one can determine the 'fit-for-use' and 'unfit-for-use' (i.e. serviceable and unserviceable) conditions of the blades. Assuming the material criterion, i.e. some disadvantageous change in the morphology of precipitates of the gamma' phase in the EI 867WD alloy under examination, the 'fit-for-use' (serviceability) thresholds for blades affected with different temperatures have been defined.
    Źródło:
    Journal of KONES; 2012, 19, 2; 271-281
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oral cavity status of long-term hemodialized patients vs. their socio-economic status
    Autorzy:
    Trzcionka, Agata
    Twardawa, Henryk
    Mocny-Pachońska, Katarzyna
    Tanasiewicz, Marta
    Powiązania:
    https://bibliotekanauki.pl/articles/2085564.pdf
    Data publikacji:
    2020-05-15
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    chronic diseases
    socio-economic status
    end-stage chronic kidney disease
    oral health
    hemodialysis
    health maintenance
    Opis:
    BackgroundThe chronic kidney disease, blood hypertension and diabetes are recognized as civilization diseases that affect more and more people. The probability of encountering a patient suffering from these diseases is increasing. As such, it appears crucial to better understand the specific dental needs of such groups of patients. The aim of the work was to assess the oral hygiene status and the needs of patients suffering from the end-stage chronic kidney disease, arterial hypertension or/and diabetes.Material and MethodsTwo hundred and twenty eight patients were included in the research. One hundred and eighty patients were hemodialized in Diaverum dialysis stations and 48 patients were from the Conservative Dentistry with Endodontics Clinic of the Academic Centre of Dentistry in Bytom, Silesian Medical University in Katowice, and from the Dentistry Division of the Arnika Clinic in Zabrze, and were not not diagnosed with any of the diseases mentioned. The research scheme was divided into 3 parts, consisting of an analysis of the general health socio-economic status, a survey and an assessment of oral health.ResultsThe patients who were not suffering from any of the discussed diseases were more aware of how to properly perform hygienic procedures. Most of the patients from both the control and examined groups were not using any rinsing solutions. A higher percentage of patients in the control group was using dental floss, changing their toothbrush every 3 months and brushing their teeth for ≥2 min. The Aproximal Plaque Index and the Oral Hygiene Index-Simplified values in the control group were significantly lower in comparison to the examined group.ConclusionsThe socio-economic status of hemodialized patients was low, which in most cases was a result of the difficulties in starting a job. Due to the lower standards of life, the neglect of oral hygiene maintenance and its consequences could be observed.
    Źródło:
    Medycyna Pracy; 2020, 71, 3; 279-288
    0465-5893
    2353-1339
    Pojawia się w:
    Medycyna Pracy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non-uniformity of the combustor exit flow temperature in front of the gas turbine
    Autorzy:
    Błachnio, J.
    Pawlak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/386460.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    gas turbine
    blade
    simulation model
    working agent temperature field
    health/maintenance status
    turbina gazowa
    łopatka turbiny
    model symulacyjny
    warunki techniczne
    Opis:
    Various types of damages to gas-turbine components, in particular to turbine blades, may occur in the course of gas turbine operation. The paper has been intended to discuss different forms of damages to the blades due to non-uniformity of the exit flow temperature. It has been shown that the overheating of blade material and thermal fatigue are the most common reasons for these damages. The paper presents results from numerical experiments with use of the computer model of the aero jet engine designed for simulations. The model has been purposefully modified to take account of the assumed non-homogeneity of the temperature field within the working agent at the turbine intake. It turned out that such non-homogeneity substantially affects dynamic and static properties of the engine considered as an object of control since it leads to a lag of the acceleration time and to increase in fuel consumption. The summarized simulation results demonstrate that the foregoing properties of a jet engine are subject to considerable deterioration in pace with gradual increase of the assumed non-homogeneity of the temperature field. The simulations made it possible to find out that variations of the temperature field nonhomogeneity within the working agent at the turbine intake lead to huge fluctuation of the turbine rpm for the idle run.
    Źródło:
    Acta Mechanica et Automatica; 2014, 8, 4; 209-213
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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