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    Tytuł:
    Study of Atkinson cycle in two-stroke diesel engine with opposed pistons
    Autorzy:
    Mitianiec, Władysław
    Powiązania:
    https://bibliotekanauki.pl/articles/133583.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    transport
    two-stroke opposite piston engine
    Atkinson cycle
    scavenging
    timing phases
    silnik o tłokach przeciwbieżnych
    obieg Atkinsona
    wymiana ładunku
    Opis:
    The paper presents possibilities of change working parameters of two-stroke diesel engine with opposed pistons. Obtaining of higher engine efficiency is realized by applying of Atkinson cycle. Modification of scavenging process by changing pistons' position connecting with two crankshafts enables asymmetrical scavenge timing. Decreasing of shorter time of closing exhaust ports before compression process and longer expansion process give higher engine work and with high charging ratio increases engine power. These types of engines are recently recommended for power plant stations. The paper includes full analysis of engine work with scavenge and combustion processes for different timing phases based on geometry of the CI Leyland L60 engine by using of CFD modelling and own 0D model. Simulation tests indicate a high scavenge efficiency, good penetration of injected fuel and fast combustion process. The work contains figures of pressure, temperature traces and emission of main chemical species in exhaust gases with comparison of engine works for different timing phases. Atkinson cycle in two-cycle work of engine and full combustion process enables to achieve high total efficiency. The study is an input for realization of such processes in a future of power plant engines with different fuelling systems.
    Źródło:
    Combustion Engines; 2019, 58, 3; 121-128
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Volume Ratio of Heat Rejection Process on Performance of an Atkinson Cycle
    Autorzy:
    Ebrahimi, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030546.pdf
    Data publikacji:
    2018-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    Atkinson cycle
    heat rejection process
    Opis:
    The objective of this study is to analyze the effect of volume ratio of heat rejection process on the performance of dual cycle. Using finite-time thermodynamics, the relations between the volume ratio of heat rejection, the thermal efficiency, the power output, the heat transfer losses, the friction power and the compression ratio for an air standard Atkinson cycle have been derived. In the model, the nonlinear relation between the specific heats of working fluid and its temperature, the frictional loss and heat leakage loss are considered. The results show that the power output and the thermal efficiency first increase with the increase of volume ratio of heat rejection process and then start to decrease. The optimum value of the volume ratio of heat rejection which maximizes the power output is higher than that which maximizes the thermal efficiency, while the optimum value of the compression ratio which maximizes the power output is lower than that which maximizes the thermal efficiency. The results obtained in the present study provide guidance to the performance evaluation and improvement for practical internal combustion engines.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 1; 201-205
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Increase of the total efficiency using the Atkinson cycle in the spark ignition engine
    Autorzy:
    Sendyka, B.
    Sochan, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/242315.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    variable valve timing
    setting of valve timing
    Atkinson cycle
    Opis:
    The paper presents the results of investigations performed on a combustion engine with Atkinson cycle included and application of variable valve timing. Investigations were carried out at constant rotational speed 2500 and 3500 RPM and at throttle opening 25% and 50%. Influence of the advance/delay angle of inlet valves closing on formation of exhaust gases toxic components such as: carbon monoxide, hydrocarbons and nitric oxides was presented. Basing on the obtained results difference of toxicity of exhaust gases before and after application of phase shifter and their concentration in places of total efficiency increments was demonstrated. Especially The Atkinson cycle comparing with conventional Otto cycle, characteristics of the electric motor applied in Toyota Prius generation, starting and work of engines (combustion engine and electric motor) during vehicle standstill, relation of specific fuel consumption in function of rotational speed for a Toyota Prius engine, generation II, in total efficiency of engines with Atkinson cycle and Mitsubishi GDI in function of rotational speed, relative increase in total efficiency as rotational speed function, influence of intake valves opening angle on concentration in exhaust gases: carbon monoxide, hydrocarbons and nitric oxides at diferrent throttle opening values are presented in the paper.
    Źródło:
    Journal of KONES; 2009, 16, 2; 407-411
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance Analysis of an Atkinson Cycle Engine under Effective Power and Effective Power Density Conditions
    Autorzy:
    Gonca, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033412.pdf
    Data publikacji:
    2017-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    gasoline engine
    Atkinson cycle
    engine performance
    power density
    finite-time thermodynamics
    Opis:
    This study presents performance optimization of an Atkinson cycle engine using criteria named as effective power and effective power density conditions. The effects of design and operating parameters such as compression ratio, cycle pressure ratio, cycle temperature ratio, equivalence ratio, bore/stroke ratio, inlet temperature, inlet pressure, engine speed, friction coefficient, mean piston speed and stroke length, on the performance characteristics have been examined. Moreover, the energy losses have been determined as fuel energy and they have been classified as incomplete combustion losses, friction losses, heat transfer losses, and exhaust output losses. Realistic values of specific heats have been used depending on temperature of working fluid. The results of the study can be assessed as an engineering tool by the Atkinson cycle engine designers.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 4; 1306-1313
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic Modeling of an Atkinson Cycle with respect to Relative Air-Fuel Ratio, Fuel Mass Flow Rate and Residual Gases
    Autorzy:
    Ebrahimi, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399496.pdf
    Data publikacji:
    2013-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.70.Ln
    82.60.Fa
    88.05.-b
    Opis:
    The performance of an air standard Atkinson cycle is analyzed using finite-time thermodynamics. The results show that if the compression ratio is less than a certain value, the power output increases with increasing relative air-fuel ratio, while if the compression ratio exceeds a certain value, the power output first increases and then starts to decrease with increase of relative air-fuel ratio. With a further increase in compression ratio, the increase in relative air-fuel ratio results in decrease of the power output. Throughout the compression ratio range, the power output increases with increase of fuel mass flow rate. The results also show that if the compression ratio is less than a certain value, the power output increases with increase of residual gases, on the contrast, if the compression ratio exceeds a certain value, the power output decreases with increase of residual gases. The results obtained herein can provide guidance for the design of practical Atkinson engines.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 1; 29-34
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Termodynamiczne wskaźniki pracy silnika spalinowego z obiegiem Atkinsona w warunkach nieustalonych
    Thermodynamic indexes of Atkinson cycle combustion engine operation under transient conditions
    Autorzy:
    Pielecha, I.
    Czajka, J.
    Borowski, P.
    Wisłocki, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/134228.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    silnik spalinowy
    stany nieustalone pracy silnika
    system start-stop
    combustion engine
    transient engine conditions
    start-stop system
    Opis:
    W artykule omówiono wyniki badań indykatorowych nieustalonych warunków pracy silnika spalinowego pracującego z wykorzystaniem obiegu Atkinsona. Warunki takie w znacznym stopniu odpowiadają za pracę jednostki napędowej i stanowią obecnie jeden z głównych kierunków prac badawczych. Badania wykonano wykorzystując układ do akwizycji sygnałów szybkozmiennych z wykorzystaniem czujników prędkości obrotowej wału korbowego oraz czujnika ciśnienia zamontowanego w świecy zapłonowej. Analizę wykonano w warunkach rozruchu silnika, a także podczas zmiany prędkości obrotowych przy zróżnicowanych obciążeniach. Określono podstawowe termodynamiczne wskaźniki procesu w warunkach nieustalonych i zestawiono je ze wskaźnikami wynikającymi z warunków ustalonych.
    The paper discusses the results of indicator research of transient states of an engine operating in the Atkinson cycle. Such states are the most frequently observable ones during engine operation and are a subject of many research and development works. The investigations were carried out using a fast varying data acquisition system using engine speed sensor and the pressure sensors fitted in the spark plug. The analysis was performed under the conditions of engine start and its changing speeds at different loads. The basic thermodynamic indexes of the process under transient states were determined and compared with the indexes obtained under steady states.
    Źródło:
    Combustion Engines; 2013, 52, 3; 517-524
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The description of the total efficiency of 2SZ-FE engine with the variable valve timing
    Autorzy:
    Sendyka, B.
    Sochan, A.
    Noga, M.
    Rodak, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/243046.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    silnik spalinowy
    obieg Atkinsona
    spalanie
    sprawność ogólna
    silnik
    combustion engine
    Atkinson cycle
    combustion
    total efficiency
    engine
    Opis:
    In this paper there were conducted tests of the combustion engine with the Atkinson cycle and with applying variable valve timing. There was described the 2SZ-FE engine characteristics and assigned the total efficiency before and after application of the phase shifter. Secondly, there was determined the thermal efficiency of the single engine work cycles and also engine 's total efficiency by using the optoelectronic pressure sensor and mathematical programme. After that, it was available to present the range of the variable valve timing. Atkinson system, phases of 2SZ-FE engine timing gear, the total efficiency distribution during 75 % of throttle opening and when inlet valves are open, the total efficiency increase during 75 % of throttle opening, the total efficiency distribution during 50 % of throttle opening and when suction valves are open, the total efficiency increase during 50 % of throttle opening, the total efficiency distribution during 25 % of throttle opening and when inlet valves are opened, the total efficiency increase during 25 % of throttle opening, the total efficiency distribution with application of phases shifter are presented in the paper.
    Źródło:
    Journal of KONES; 2007, 14, 2; 401-407
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Realization of the Atkinson-Miller cycle in spark-ignition engine by means of the fully variable inlet valve control system
    Autorzy:
    Żmudka, Z.
    Postrzednik, S.
    Przybyła, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/240220.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spark-ignition engine
    variable inlet valve control
    open theoretical cycle
    charge exchange process
    silnik o zapłonie iskrowym
    zawór
    otwarty obieg teoretyczny
    wymiana ładunku
    Opis:
    The theoretical analysis of the charge exchange process in a spark ignition engine has been presented. This process has significant impact on the effectiveness of engine operation because it is related to the necessity of overcoming the flow resistance, followed by the necessity of doing a work, so-called the charge exchange work. The flow resistance caused by the throttling valve is especially high during the part load operation. The open Atkinson-Miller cycle has been assumed as a model of processes taking place in the engine. Using fully variable inlet valve timing the A-M cycle can be realized according to two systems: system with late inlet valve closing and system with early inlet valve closing. The systems have been analysed individually and comparatively with the open Seiliger-Sabathe cycle which is a theoretical cycle for the classical throttle governing of the engine load. Benefits resulting from application of the systems with independent inlet valve control have been assessed on the basis of the selected parameters: fuel dose, cycle work, charge exchange work and a cycle efficiency. The use of the analysed systems to governing of the SI engine load will enable to eliminate a throttling valve from the system inlet and reduce the charge exchange work, especially within the range of part load operation.
    Źródło:
    Archives of Thermodynamics; 2014, 35, 3; 191-205
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carnotization of the power cycle of internal combustion reciprocating engine
    Karnotyzacja obiegu tłokowego silnika spalinowego
    Autorzy:
    Mendera, K. Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/244333.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    obieg teoretyczny
    obieg z przedłużoną ekspansją
    obieg Atkinsona
    obieg Millera
    wczesne zamknięcie zaworu dolotowego
    późne zamknięcie zaworu dolotowego
    Air Standard Cycle
    Extended expansion cycle
    Miller cycle
    Atkinson cycle
    Early Intake Valve Closure
    Late Intake Valve Closure
    Opis:
    There are two ways to increase the thermodynamic efficiency of the engine cycle known as the carnotization of the power cycle. The first is to ensure the highest possible maximum parameters and the second is to allow the working medium to expand further than in the standard cycle. This is known generally as the over-expansion or extended expansion cycle. This paper presents theoretical and numerical investigations into the effect of extended expansion on the thermal efficiency and mean effective pressure. The performance of an air standard Atkinson cycle was considered and compared to that of the Sabathe cycle. The Miller version of extended expansion air standard cycle was analysed for both naturally aspirated and supercharged engine. Additionally, the numerical simulation of supercharged engine was also carried out. In both cases, two inlet valve closing strategies were evaluated (Early Intake Valve Closure-EIVC and Late Intake Valve Closure - LIVC). From the present investigation it is concluded that the extended expansion concept is an effective way of the carnotization of the power cycle of internal combustion reciprocating engine. The main conclusion resultanting from presented paper deals controls of closing angle of inlet valve which is to be an effective way of influence on the course of temperature changes of the working charge and what should be useful for the level emission decreasing of nitrous oxides.
    Karnotyzacja obiegu silnika spalinowego tj. poszukiwanie sposobu podwyższenia jego sprawności może dotyczyć zarówno źródła górnego (sposobu doprowadzania ciepła) jak i dolnej przemiany odprowadzania ciepła Karnotyzacja źródła dolnego to wszelkie próby zmierzające do przedłużenia ekspansji czynnika roboczego. W pracy przedstawiono teoretyczną i numeryczną analizę wpływu przedłużenia ekspansji na sprawność i ciśnienie średnie obiegu silnikowego. Przeprowadzono analizę teoretyczną obiegu Atkinsona, a jej wyniki porównano z klasycznym obiegiem Sabathe. Dokonano także analizy obiegu Millera zarówno dla silnika niedoładowanego jak i doładowanego oraz zrealizowano badania symulacyjne obiegu doładowanego silnika z przedłużoną ekspansją. W obu przypadkach analizę przeprowadzono zarówno dla wczesne zamknięcie zaworu dolotowego jak i późnego zamknięcie zaworu dolotowego. Przeprowadzone badania usprawiedliwiają tezę, iż koncepcja przedłużonej ekspansji może być skutecznym sposobem karnotyzacji obiegu tłokowego silnika spalinowego. Główny wniosek wynikający z prezentowanego artykułu dotyczy sterowania kątem zamknięcia zaworu dolotowego, może być efektywnym sposobem oddziaływania na przebieg zmian temperatury czynnika roboczego i co powinno być przydatne dla ograniczania poziomu emisji tlenków azotu.
    Źródło:
    Journal of KONES; 2007, 14, 4; 257-264
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Late intake valve closing as a way of the throttleless control of SI engine load
    Autorzy:
    Żmudka, Z.
    Postrzednik, S.
    Przybyła, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/247952.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    spark-ignition engine
    variable valve actuation
    late intake valve closing
    open Atkinson-Miller cycle
    charge exchange process
    cycle efficiency
    Opis:
    The paper tackles the problems connected with the charge exchange in internal combustion engines. The theoretical analysis of the charge exchange process in the SI engine has been presented. The realization of the charge exchange process is connected with the necessity of overcoming the flow resistances, then with the necessity of doing a work, so-called the charge exchange work. The flow resistance caused by throttling valve is especially high at the partial load running of an engine. A system with independent, late intake valve closing has been analysed. The use of the analysed system to governing of an engine load will enable to eliminate a throttling valve from inlet system and reduce the charge exchange work, especially within the range of partial load. The decrease of the charge exchange work leads to an increase of the internal and effective works, which results in an increase of the effective efficiency of the spark ignition engine. The open, theoretical Atkinson-Miller cycle has been assumed as a model of processes proceeding in the engine with variable intake valve actuation. The system has been analysed individually and comparatively with open Seiliger-Sabathe cycle, which is theoretical cycle for the classic throttle governing of engine load. Benefits resulting from application of the system with late intake valve closing have been assessed on the basis of the selected parameters: a fuel dose, a cycle work, relative charge exchange work and cycle efficiency.
    Źródło:
    Journal of KONES; 2012, 19, 1; 491-499
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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