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    Wyświetlanie 1-6 z 6
    Tytuł:
    6-stroke engine: thermodynamic modelling and design for testing
    Autorzy:
    Nimsiriwangso, Atip
    Barnes, Paul
    Doustdar, Omid
    Wyszynski, Miroslaw L.
    Mohyeldin, Gasim Mohamed Maisara
    Kowalski, Miroslaw
    Powiązania:
    https://bibliotekanauki.pl/articles/241771.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    six-stroke engine
    water injection
    steam expansion
    engine efficiency
    dynamic gas model
    Opis:
    In the study AVL BOOST™ is used to perform a thermodynamic simulation of a six-stroke engine, being built by a research team based in Saudi Arabia. The six-stroke cycle consists of a standard four-stroke Otto Cycle followed by a heat recovering steam expansion cycle. Water is injected into the hot combustion chamber towards the end of the Otto expansion stroke producing steam, which is used to perform work on a piston. This process produces power using waste heat and therefore increases the overall efficiency of the engine. The Robin EY28D engine, which is a single cylinder, four-stroke, gasoline engine was used for this simulation study. The engine was modelled and converted into six-stroke engine in AVL BOOST. The results show that six-stroke engine is more efficient than four-stroke engine. In six-stroke engine, the engine power is increased by 33.1% and brake specific fuel consumption (BSFC) is decreased by approximately 16%. Where emissions are concerned, Nitrogen Oxide (NOx) emission from six-stroke engine is reduced by 80%, while the Hydrocarbon (HC) emission increases by 85% compared with the original 4-stroke. Moreover, the most efficient camshaft was found and designed according to the most efficient valve profile for this engine, which is combination of 60CA° of valve duration and 10 mm of valve lifting.
    Źródło:
    Journal of KONES; 2019, 26, 2; 93-106
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ rezydualnego nasycenia gazem poniżej stwierdzonego kontaktu woda–gaz na proces eksploatacji złoża
    Impact of residual gas saturation below the specified water-gas contact on the production process
    Autorzy:
    Tuczyński, Tomasz
    Podsobiński, Daniel
    Stopa, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/1834112.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Nafty i Gazu - Państwowy Instytut Badawczy
    Tematy:
    rezydualna strefa nasycenia gazem
    krytyczne nasycenie gazem
    dynamiczny model złoża
    wodnonaporowy system energetyczny złoża
    residual gas zone
    critical gas saturation
    dynamic reservoir model
    water drive mechanism
    Opis:
    Natural gas fields over millions of years are exposed to various geological factors that affect their final state and shape. It happens that after some time of production, the reservoir has additional energy and greater gas resources than originally expected. The reason for this may be residual gas saturation below the specified gas–water contact, which has not been included in previous analyzes. Disregarding the residual hydrocarbon zone may lead to erroneous conclusions about resources, recovery factors and water breakthrough time. In this paper the residual gas zone impact on the production process from a real gas-condensate reservoir has been analyzed. The calculations were conducted using a dynamic reservoir model created in Eclipse numerical simulator. For the purpose of the analysis, 6 dynamic models were made. On their basis, an analysis of the impact on cumulative gas and water production was carried out for parameters such as: critical gas saturation in the residual zone and volume of aquifer. Based on the presented example, the overall gas initial in place after taking into account the residual zone has increased about 19%. However, the impact of the residual gas zone on cumulative gas production is not clearcut and its presence can have a positive as well as negative impact on the cumulative gas production. The size and type of the impact resulting from presence of the residual gas zone is directly related to the geological and reservoir conditions in the given reservoir and the way of production operation. The obtained results indicate also that the residual gas zone may affect the water breakthrough time in production wells as well as total volume of produced water.
    Źródło:
    Nafta-Gaz; 2020, 76, 9; 585-591
    0867-8871
    Pojawia się w:
    Nafta-Gaz
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of Turboshaft Engine Adaptive Dynamic Model: Analysis of Estimation Errors
    Autorzy:
    Yepifanov, Sergiy
    Bondarenko, Oleksiy
    Powiązania:
    https://bibliotekanauki.pl/articles/36807197.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    turbine engine
    turboshaft
    gas generator
    dynamic model
    engine time constant
    identification
    estimation error
    design of experiment
    Opis:
    One of the most perspective directions of aircraft engine development is related to implementing adaptive automatic electronic control systems (ACS). The significant elements of these systems are algorithms of matching of mathematical models to actual performances of the engine. These adaptive models are used directly in control algorithms and are a combination of static and dynamic sub-models. This work considers the dynamic sub-models formation using the Least Square method (LSM) on a base of the engine parameters that are measured in-flight. While implementing this function in the (ACS), the problem of checking the sufficiency of the used information for ensuring the required precision of the model arises. We must do this checking a priori (to determine a set of operation modes, the shape of the engine test impact and volume of recorded information) and a posteriori. Equations of the engine models are considered. Relations are derived that determine the precision of parameters of these models’ estimation depending on the precision of measurement, the composition of the engine power ratings, and durability of observations, at a stepwise change of fuel flow. We present these relations in non-dimensional coordinates that make them universal and ready for application to any turboshaft engine.
    Źródło:
    Transactions on Aerospace Research; 2022, 4 (269); 59-71
    0509-6669
    2545-2835
    Pojawia się w:
    Transactions on Aerospace Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling atmosphere composition and determining explosibility in a sealed coal mine volume
    Modelowanie składu powietrza i określanie niebezpieczeństwa wybuchu w zamkniętej przestrzeni w obrębie kopalni węgla
    Autorzy:
    Cheng, J.
    Luo, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/220237.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    powietrze w odizolowanej części kopalni
    niebezpieczeństwo wybuchu gazów kopalniach
    model symulacyjny
    dynamiczne zmiany składu powietrza
    mine sealed atmosphere
    mine gas explosibility
    simulation model
    dynamic atmosphere changes
    Opis:
    Explosions originated from or around the sealed areas in underground coal mines present a serious safety threat. The explosibility of the mine atmosphere depends on the composition of oxygen, combustible and inert gases. In additional, the composition in the inaccessible sealed areas change with time under various factors, such as gases emissions, air leakage, inert gases injected, etc. In order to improve mine safety, in this paper, a mathematical model based on the control volume approach to simulate the atmosphere compositions is developed, and the expanded Coward explosibility triangle diagram is used to assess the mine gas explosion risk. A computer program is developed to carry out the required computations and to display the results. In addition, the USBM explosibility diagram is also included in the program to serve as a double check.
    Wybuchy powstające wewnątrz lub wokół zamkniętych (odizolowanych) regionów w podziemnych kopalniach węgla stanowią poważne zagrożenie. Możliwość wystąpienia wybuchu powietrza kopalnianego uzależniona jest od proporcji zawartego w nim tlenu, gazów palnych i gazów obojętnych. Ponadto, skład atmosfery wewnątrz zamkniętych odizolowanych przestrzeni ulega zmianom w czasie pod wpływem różnorakich czynników: wydzielanie gazów, przecieki powietrza, doprowadzanie gazów obojętnych. Dla poprawy bezpieczeństwa pracy w kopalni opracowano model matematyczny bazujący na metodzie objętości kontrolnej dla symulacji składu powietrza. Rozszerzony wykres Cowarda wskazujący skłonność do wybuchu wykorzystany został do oszacowania ryzyka wystąpienia wybuchu gazów kopalnianych. Opracowano program komputerowy który wykonuje niezbędne obliczenia i wyświetla wyniki. Ponadto, dla dodatkowego potwierdzenia wyników wykorzystano wykres USBM obrazujący niebezpieczeństwo wybuchu.
    Źródło:
    Archives of Mining Sciences; 2014, 59, 1; 25-40
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A mathematical model of two-stage Solid Oxide Fuel Cell, SOFC, stacks for dynamic simulation of Combined Heat and Power system fed by natural gas
    Autorzy:
    Palus, Mateusz
    Pianko-Oprych, Paulina
    Powiązania:
    https://bibliotekanauki.pl/articles/1849268.pdf
    Data publikacji:
    2021
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    dynamic model
    natural gas
    Solid Oxide Fuel Cell stacks
    Combined Heat and Power
    CHP
    system
    Balance of Plant
    BoP
    modelling
    Catalytic Partial Oxidation
    CPOx
    reformer
    steam reformer
    Opis:
    Zero-dimensional two-stage SOFC stacks dynamic model was developed to investigate the effect of operating parameters on stacks performance. The model resolves spatially thermal and thermo-electrochemical behaviour for electrochemical reactions, Catalytic Partial Oxidation and Steam Reforming processes. Design variables and thermo-electrochemical properties were obtained from in-house-fabricated SOFCs carried out by project partners. The completed SOFCs based Combined Heat and Power, CHP, system model was validated by data18 and numerical results obtained at steady-state mode showing its high-fidelity. A parametric study with respect to key operating parameters including changes in fuel utilization, lambda number and current density values was conducted. The global CHP system dynamic response, in term of the current/voltage delivered by two-stage SOFC stacks, under a fi xed fuel utilization, has been determined resulting in greater variations in the voltage of a single cell in the first stack in comparison to the corresponding values in the second stack.
    Źródło:
    Polish Journal of Chemical Technology; 2021, 23, 2; 1-11
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A mathematical model of two-stage Solid Oxide Fuel Cell, SOFC, stacks for dynamic simulation of Combined Heat and Power system fed by natural gas
    Autorzy:
    Palus, Mateusz
    Pianko-Oprych, Paulina
    Powiązania:
    https://bibliotekanauki.pl/articles/1849273.pdf
    Data publikacji:
    2021
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    dynamic model
    natural gas
    Solid Oxide Fuel Cell stacks
    Combined Heat and Power
    CHP
    system
    Balance of Plant
    BoP
    modelling
    Catalytic Partial Oxidation
    CPOx
    reformer
    steam reformer
    Opis:
    Zero-dimensional two-stage SOFC stacks dynamic model was developed to investigate the effect of operating parameters on stacks performance. The model resolves spatially thermal and thermo-electrochemical behaviour for electrochemical reactions, Catalytic Partial Oxidation and Steam Reforming processes. Design variables and thermo-electrochemical properties were obtained from in-house-fabricated SOFCs carried out by project partners. The completed SOFCs based Combined Heat and Power, CHP, system model was validated by data18 and numerical results obtained at steady-state mode showing its high-fidelity. A parametric study with respect to key operating parameters including changes in fuel utilization, lambda number and current density values was conducted. The global CHP system dynamic response, in term of the current/voltage delivered by two-stage SOFC stacks, under a fi xed fuel utilization, has been determined resulting in greater variations in the voltage of a single cell in the first stack in comparison to the corresponding values in the second stack.
    Źródło:
    Polish Journal of Chemical Technology; 2021, 23, 2; 1-11
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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