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Wyszukujesz frazę "Jerzy Kowalski" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-13 z 13
    Tytuł:
    The CFD analysis of influence the start of fuel injection (SOI) on combustion parameters and exhaust gas composition of the marine 4-stroke engine
    Autorzy:
    Kowalski, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/133899.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    marine four-stroke engine
    NOx emission
    CFD model
    combustion
    SOI
    start of injection angle
    czterosuwowy silnik okrętowy
    emisja NOx
    model CFD
    spalanie
    kąt początku wtrysku
    Opis:
    The paper presents a theoretical analysis of the impact of injection timing on the parameters of the combustion process and the composition of exhaust gas from a 4-stroke engine designed to shipbuilding. The analysis was carried out based on a three-dimensional multi-zone model of the combustion process. This model has been prepared on the basis of properties of the research facility. The input data to the model were obtained through laboratory tests. Results of calculations showed that the change of the start of injection angle (SOI) from the value of 14 degrees before TDC to 22 degrees before TDC results in changes in the combustion rate and thus an increase in the temperature of the combustion process as well as the increase of nitric oxides fraction in the exhaust gas. Simultaneously the maximum combustion pressure increases also.
    Źródło:
    Combustion Engines; 2019, 58, 2; 40-45
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametric analysis of the efficiency of the combined gas-steam turbine unit of a hybrid cycle for the FPSO vessel
    Autorzy:
    Serbin, Serhiy
    Washchilenko, Nikolay
    Dzida, Marek
    Kowalski, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/2033277.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    combined-cycle
    gas turbine
    steam turbine
    power plant
    Opis:
    A thermal diagram of the combined gas‒steam turbine unit of a hybrid cycle, which is an energy complex consisting of a base gas turbine engine with a steam turbine heat recovery circuit and a steam-injected gas turbine operating with overexpansion, is proposed. A mathematical model of a power plant has been developed, taking into consideration the features of thermodynamic processes of simple, binary, and steam-injected gas‒steam cycles. Thermodynamic investigations and optimization of the parameters of a combined installation of a hybrid cycle for the generation of electrical energy have been carried out. Three-dimensional calculations of the combustion chamber of a steam-injected gas turbine were carried out, which confirmed the low emissions of the main toxic components.
    Źródło:
    Polish Maritime Research; 2021, 4; 122-132
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations of the emission characteristics of a dual-fuel gas turbine combustion chamber operating simultaneously on liquid and gaseous fuels
    Autorzy:
    Serbin, Serhiy
    Diasamidze, Badri
    Gorbov, Viktor
    Kowalski, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/1573591.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    gas turbine engine
    dual-fuel combustion
    combustion chamber
    liquid and gaseous fuels
    Opis:
    This study is dedicated to investigations of the working process in a dual-fuel low-emission combustion chamber for a floating vessel’s gas turbine. As the object of the research, a low-emission gas turbine combustion chamber with partial premixing of fuel and air inside the outer and inner radial-axial swirls was chosen. The method of the research is based on the numerical solution of the system of differential equations which represent the physical process of mass and energy conservation and transformations and species transport for a multi-component chemically reactive turbulent system, considering nitrogen oxides formation and a discrete ordinates model of radiation. The chemistry kinetics is presented by the 6-step mechanism of combustion. Seven fuel supply operating modes, varying from 100% gaseous fuel to 100% liquid fuel, have been analysed. This analysis has revealed the possibility of the application of computational fluid dynamics for problems of dual-fuel combustion chambers for the design of a floating vessel’s gas turbine. Moreover, the study has shown the possibility of working in different transitional gaseous and liquid fuel supply modes, as they satisfy modern ecological requirements. The dependencies of the averaged temperature, NO, and CO concentrations along the length of the low-emission gas turbine combustion chamber for different cases of fuel supply are presented. Depending on the different operating modes, the calculated emission of nitrogen oxides NO and carbon monoxide CO at the outlet cross-section of a flame tube are different, but, they lie in the ranges of 31‒50 and 23‒24 mg/nm3 on the peak of 100% liquid fuel supply mode. At operating modes where a gaseous fuel supply prevails, nitrogen oxide NO and carbon monoxide CO emissions lie in the ranges of 1.2‒4.0 and 0.04‒18 mg/nm3 respectively.
    Źródło:
    Polish Maritime Research; 2021, 2; 85-95
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the characteristics of a low-emission gas turbine combustion chamber operating on a mixture of natural gas and hydrogen
    Autorzy:
    Serbin, Serhiy
    Burunsuz, Kateryna
    Chen, Daifen
    Kowalski, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/32899814.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    gas turbine
    low-emission combustion chamber
    ecological parameters
    emission of toxic components
    Opis:
    This article is devoted to the investigation of the characteristics of a low-emission gas turbine combustion chamber, which can be used in Floating Production, Storage and Offloading (FPSO) vessels and operates on a mixture of natural gas and hydrogen. A new approach is proposed for modelling the processes of burning out a mixture of natural gas with hydrogen under preliminary mixing conditions in gaseous fuel with an oxidizer in the channels of radial-axial swirlers of flame tubes. The proposed kinetic hydrocarbon combustion scheme is used in three-dimensional calculations for a cannular combustion chamber of a 25 MW gas turbine engine for two combustion models: the Finite-Rate/Eddy-Dissipation and the Eddy Dissipation Concept. It was found that, for the investigated combustion chamber, the range of stable operations, without the formation of a flashback zone in the channels of radial-axial swirlers, is determined by the hydrogen content in the mixture, which is less than 25-30% (by volume). For the operating modes of the chamber without the formation of a flashback zone inside the swirler channels, the emissions of nitrogen oxide NO and carbon monoxide CO do not exceed the values corresponding to modern environmental requirements for emissions of toxic components by gas turbine engines.
    Źródło:
    Polish Maritime Research; 2022, 2; 64-76
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessing the potential replacement of mineral oil with environmentally acceptable lubricants in a stern tube bearing: an experimental analysis of bearing performance
    Autorzy:
    Kowalski, Jerzy
    Leśniewski, Wojciech
    Piątek, Daniel
    Cuper-Przybylska, Dominika
    Powiązania:
    https://bibliotekanauki.pl/articles/2033285.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    environmentally acceptable lubricants
    EALs
    mineral oil
    stern tube bearing
    bearing wear
    marine bearing
    Opis:
    This study compares the performance of a plain bearing, with a similar structure to a tail shaft stern bearing, lubricated with either mineral oil or an environmentally acceptable lubricant (EAL). The main characteristic of the bearing is its length/diameter ratio of <1. Measurements are carried out with the bearing operating under loads from 0.5 to 1 MPa and seven speeds ranging from 1 to 11 rev/s. The bearing lubricated with either mineral oil with a viscosity grade of 100 or an environmentally acceptable lubricant (EAL) with a viscosity grade of 100 or 150 is investigated according to the ISO standard. Bearing wear is simulated by increasing the clearance circle by 0.1 mm. According to the results obtained, the use of an EAL in place of mineral oil does not cause significant changes in the bearing performance, regardless of the value of the clearance radius. The pressure distribution in the oil film, bearing load carrying capacity, eccentricity and friction coefficient have similar values for the entire load and speed ranges considered, and the discrepancies in the results are within the range of the measurement errors. Only an increase in EAL viscosity causes significant changes in bearing performance and these changes comply with the general theory of lubrication.
    Źródło:
    Polish Maritime Research; 2021, 4; 160-166
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical modelling of marine power plants with thermochemical fuel treatment
    Autorzy:
    Cherednichenko, Oleksandr
    Serbin, Serhiy
    Tkach, Mykhaylo
    Kowalski, Jerzy
    Chen, Daifen
    Powiązania:
    https://bibliotekanauki.pl/articles/32907384.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    marine power plants
    thermochemical fuel treatment system
    gas turbine engine
    mathematical modeling
    Opis:
    The article considers the methodological aspects of the theoretical investigation of marine power plants with thermochemical fuel treatment. The results of the study of the complex influence of temperature, pressure, and the ratio of steam / base fuel on the thermochemical treatment efficiency are presented. The adequacy of the obtained regression dependences was confirmed by the physical modelling of thermochemical fuel treatment processes. For a gas turbine power complex with a thermochemical fuel treatment system, the characteristics of the power equipment were determined separately with further merging of the obtained results and a combination of material and energy flow models. Algorithms, which provide settings for the mathematical models of structural and functional blocks, the optimisation of thermochemical energy transformations, and verification of developed models according to the indicators of existing gas turbine engines, were created. The influence of mechanical energy consumption during the organisation of thermochemical processing of fuel on the efficiency of thermochemical recuperation is analysed.
    Źródło:
    Polish Maritime Research; 2022, 3; 99-108
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Towards uniformity of rotational events recording : initial data from common test engaging more than 40 sensors including a wide number of fiber-optic rotational seismometers
    Autorzy:
    Kurzych, Anna
    Jaroszewicz, Leszek R.
    Dudek, Michał
    Sakowicz, Bartosz
    Kowalski, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/1818206.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    seismometer
    optical fiber interferometer
    recording
    rotational seismology
    Opis:
    Rotational seismology is one of the fastest developing fields of science nowadays with strongly recognized significance. Capability of monitoring rotational ground motions represents a crucial aspect of improving civil safety and efficiency of seismological data gathering. The correct sensing network selection is very important for reliable data acquisition. This paper presents initial data obtained during the international research study which has involved more than 40 various rotational sensors collected in one place. The key novelty of this experiment was the possibility to compare data gathered by completely different rotational sensors during artificially generated ground vibrations. Authors collected data by four interferometric optical fiber sensors, Fiber-Optic System for Rotational Events & Phenomena Monitoring (FOSREM), which are mobile rotational seismographs with a wide measuring range from 10⁻⁷ rad/s up to even few rad/s, sensitive only to the rotational component of the ground movement. Presented experimental results show that FOSREMs are competitive in rotational events recording compared with the state-of-the-art rotational sensors but their operation still should be improved.
    Źródło:
    Opto-Electronics Review; 2021, 29, 1; 39--44
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High quality multi-zone and 3d CFD model of combustion in marine diesel engine cylinder
    Autorzy:
    Cuper-Przybylska, Dominika
    Nguyen, Van Nhanh
    Cao, Dao Nam
    Kowalski, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/32921247.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    CFD combustion model
    large 4-stroke engine
    diesel engine
    emission
    NOx concentration
    Opis:
    The paper presents a 3D model of the processes taking place in the cylinder of a large 4-stroke marine engine. The model is based on CFD calculations performed on the moving mesh. The modelling range includes the full duty cycle (720° crankshaft position) and the complete geometry of the cylinder with inlet and exhaust ducts. The input data, boundary conditions and validation data were obtained by direct measurements on the real object. Fuel injection characteristics were obtained by Mie scattering measurements in a fixed-volume chamber. The modelling results have been validated in terms of the pressure characteristics of the engine’s cylinder within the entire range of its loads. The mean error did not exceed 1.42% for the maximum combustion pressure and 1.13% for the MIP (Mean Indicated Pressure). The model was also positively validated in terms of the O2 and NOx content of the exhaust gas. The mean error in this case was 1.2% for NOx fractions in the exhaust gas and 0.4% for O2 fractions. The complete model data has been made available in the research data repository on an open access basis.
    Źródło:
    Polish Maritime Research; 2023, 2; 61-67
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Planning and management of aircraft maintenance using a genetic algorithm
    Autorzy:
    Kowalski, Mirosław
    Izdebski, Mariusz
    Żak, Jolanta
    Gołda, Paweł
    Manerowski, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/1841765.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    aircraft operation
    maintenance
    multi-criteria optimization
    genetic algorithm
    Opis:
    The aim of the article was to develop a tool to support the process of planning and managing aircraft (ac) maintenance. Aircraft maintenance management has been presented for scheduled technical inspections resulting from manufacturers’ technical documentation for ac. The authors defined the problem under investigation in the form of a four-phase decisionmaking process taking into account assignment of aircraft to airports and maintenance stations, assignment of crew to maintenance points, setting the schedules, i.e. working days on which aircraft are directed to maintenance facilities. This approach to the planning and management of aircraft maintenance is a new approach, unprecedented in the literature. The authors have developed a mathematical model for aircraft maintenance planning and management in a multi-criteria approach and an optimisation tool based on the operation of a genetic algorithm. To solve the problem, a genetic algorithm was proposed. The individual steps of the algorithm construction were discussed and its effectiveness was verified using real data.
    Źródło:
    Eksploatacja i Niezawodność; 2021, 23, 1; 143-153
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Planning and management of aircraft maintenance using a genetic algorithm
    Autorzy:
    Kowalski, Mirosław
    Izdebski, Mariusz
    Żak, Jolanta
    Gołda, Paweł
    Manerowski, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/1841824.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    aircraft operation
    maintenance
    multi-criteria optimization
    genetic algorithm
    Opis:
    The aim of the article was to develop a tool to support the process of planning and managing aircraft (ac) maintenance. Aircraft maintenance management has been presented for scheduled technical inspections resulting from manufacturers’ technical documentation for ac. The authors defined the problem under investigation in the form of a four-phase decisionmaking process taking into account assignment of aircraft to airports and maintenance stations, assignment of crew to maintenance points, setting the schedules, i.e. working days on which aircraft are directed to maintenance facilities. This approach to the planning and management of aircraft maintenance is a new approach, unprecedented in the literature. The authors have developed a mathematical model for aircraft maintenance planning and management in a multi-criteria approach and an optimisation tool based on the operation of a genetic algorithm. To solve the problem, a genetic algorithm was proposed. The individual steps of the algorithm construction were discussed and its effectiveness was verified using real data.
    Źródło:
    Eksploatacja i Niezawodność; 2021, 23, 1; 143-153
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simple three-stage frequency-stabilized diode laser system using injection-locking and tapered amplifier
    Autorzy:
    Szonert, Jerzy
    Głódź, Małgorzata
    Kowalski, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2063897.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    diode laser
    optical injection-locking
    master oscillator power amplifier
    optical limiting amplifier
    tapered amplifier
    Opis:
    We developed a three-stage, amplifying, tunable diode laser system that comprises a master laser in a Littrow configuration, frequency-stabilized by dichroic atomic vapour laser lock, acousto-optic frequency shifter, injection-locked slave laser, and tapered amplifier. The slave amplifies the injected frequency-shifted master beam while suppressing (within 0.5%) the strong dependence of its intensity on the acousto-optic frequency shifter carrier frequency, thus acting as a strongly saturated optical limiting amplifier with constant output power. The resulting beam is then amplified in a tapered amplifier. The system provides an output power above 700 mW at a wavelength of 780 nm, with a time-averaged linewidth of 0.6 MHz, and a frequency drift below 2 MHz/h. Dichroic atomic vapour laser lock enables frequency stabilization in the range of 400 MHz around D2 lines of rubidium. The mode-hop-free tuning range amounts to 2 GHz. Determined by the acousto-optic frequency shifter model used, the fine-tuning range (recision of few tens kHz) spans 70 MHz. A description of the system was presented and its performance was tested. The basic components have been designed in our laboratory.
    Źródło:
    Opto-Electronics Review; 2022, 30, 1; 1--13
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Search for new synthetic immunosuppressants II. Tetrazole analogues of hymenistatin I.
    Autorzy:
    Zubrzak, Paweł
    Kociołek, Karol
    Smoluch, Marek
    Silberring, Jerzy
    Kowalski, Marek
    Szkudlińska, Barbara
    Zabrocki, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1044066.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    immunosuppression
    cis-amide bond
    1,5-disubstituted tetrazole ring
    hymenistatin I
    Opis:
    Linear and cyclic hymenistatin I (HS I) analogues with dipeptide segments Ile2-Pro3, Pro3-Pro4 and Val6-Pro7 replaced by their tetrazole analogues Ile-Ψ[CN4]-Ala3, Pro3-Ψ[CN4]-Ala4 and Val6-Ψ[CN4]-Alawere synthesized by the solid phase peptide synthesis method and cyclized with the TBTU and/or HATU reagent. The peptides were examined for their immunosuppressive activity in the lymphocyte proliferation test (LPT).
    Źródło:
    Acta Biochimica Polonica; 2001, 48, 4; 1151-1154
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Framing Polish-Jewish Relations Through Shakespeare in Post-war and Contemporary Polish Theatre
    Autorzy:
    Kowalski, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/39774053.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Tematy:
    Polish-Jewish relations
    Holocaust
    antisemitism
    Jerzy Grotowski
    Krzysztof Warlikowski
    'Hamlet' in Poland
    'Hamlet Study'
    'The Merchant of Venice' in Poland
    Opis:
    The paper aims to analyse how the staging of Shakespeare’s texts in post-war and contemporary Poland reflected the indifferent and hostile attitudes of Poles towards Jews, particularly during the Holocaust, and the distortions and gaps in the collective memory regarding the events. In the first part, the author focuses on Hamlet Study (dir. Jerzy Grotowski) performed in 1964 by Laboratory Theatre of 13 Rows in Opole, which is symptomatic of silencing the matter during the communist period. The second part draws from the statement of Jan Ciechowicz, a Polish theatre historian, who claimed that “the Holocaust killed Shylock for Polish stage.” While verifying it, the author analyses selected aspects of three productions directed by Krzysztof Warlikowski (The Tempest (2003), The Merchant of Venice (1994) and The African Tales by Shakespeare (2011)) and juxtaposes them against the background of the changes in collective memory. He argues that the most cogent productions concerning Polish attitudes towards Jews are those that position the audience as witnesses of the acts of re-enacted violence and thus provoke an affective response.
    Źródło:
    Multicultural Shakespeare: Translation, Appropriation and Performance; 2023, 28, 43; 193-207
    2083-8530
    2300-7605
    Pojawia się w:
    Multicultural Shakespeare: Translation, Appropriation and Performance
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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