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    Tytuł:
    The simulation of performance characteristics of port injection dedicated compressed natural gas spark ignition engine
    Autorzy:
    Semin, Semin
    Abu Bakar, R.
    Ismail, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/950139.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    CNG engine
    computational modelling
    engine performance
    port/sequential injection
    Opis:
    This paper presents the computational modelling simulation results of port/sequential injection dedicated compressed natural gas (CNG) spark ignition engine to investigate and evaluate the engine performance while base engine converted by using compressed natural gas as an alternative fuel. The baseline engine in this research is four stroke direct injection diesel engine. The computational modelling design and development has performed using GT-Power software at Automotive Excellent Centre Laboratory, Faculty of Mechanical Engineering, University Malaysia Pahang, Malaysia. To investigate the engine performance, the engine computational model is operated between 500-4000 rpm, under steady state condition. In this research, the sequential injection dedicated compressed natural gas spark ignition engine performance investigation results such as torque, power, fuel consumption pressure and exhaust gas emissions were investigated and compared to base diesel engine performance. From the CNG engine computational modelling simulation results are shown that by development of sequential injection dedicated compressed natural gas spark ignition engine has a potential to reduce the engine emissions. Unfortunately, the development of sequential injection dedicated compressed natural gas spark ignition engine can be reducing the engine performance. However, the study of required to improve the performance of sequential injection dedicated compressed natural gas spark ignition engine has a potential of reducing engine.
    Źródło:
    Journal of KONES; 2008, 15, 2; 427-432
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The performance and emissions characteristics of a compressed natural gas spark ignition engine
    Autorzy:
    Abu Bakar, R.
    Semin, Semin
    Idris, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/950140.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    compressed natural gas engine
    emission
    performance
    spark ignition
    Opis:
    This paper presents the experimental results of a spark ignition engine to evaluate its performance and emissions characteristics while using conventional fuel and alternative fuel; compressed natural gas (CNG). To evaluate the performance, the engine is operated between 1500-4000 rpm, under steady state condition with wide open throttle (WOT). The emissions test was performed with various constant loads at each speed. The first experiment is did by using conventional fuel and followed by CNG. The engine performance and emissions results such as brake power, brake specific fuel consumption (BSFC), CO, HC and NOx from CNG were measured and compared to conventional fuel. The experiment has performed at Automotive Laboratory Faculty of Mechanical Engineering, University Malaysia Pahang by using in-housed developed engine test rig. From the experiment being done it is demonstrated that the potential of reducing emissions while applying CNG as fuel is obvious. However, the further study of required improving the performance of the engine. The results and analysis will be useful for the development of dedicated CNG engine in the future. The application of CNG as fuel for spark ignition engine gives the average reduction power of 25% at WOT, 45% at POT and gives the average brake power reduction of 37% at WOT and 56% at POT base from spark ignition engine. Average BSFC of CNG are near about 33% higher than gasoline for WOT and 39% higher than gasoline for POT. The average CO emission reduction is reduction is 66% at WOT and 64% at POT. The average reduction of CO2 emission at WOT while using CNG is 6% and at POT only 1%. The average reduction of HC emission at WOT is 76% and at POT is 74%. The average reduction of NOx emission at WOT is 15% and at POT is 18%. The disadvantages of CNG as fuel in spark ignition engine has reduced power 37-56%, but the advantages for environment protection CNG as fuel has reduced the exhaust gas emissions.
    Źródło:
    Journal of KONES; 2008, 15, 2; 9-14
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of automated mine ventilation control systems for Belarusian potash mines
    Autorzy:
    Semin, Mikhail A.
    Levin, Lev Y.
    Maltsev, Stanislav V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1853845.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wentylacja kopalni
    wentylator
    automatyczne sterowanie wentylacją
    mine ventilation
    ventilation on demand
    automated ventilation control
    energy efficiency
    main fan
    ventilation door
    potash mines
    Opis:
    In recent decades, two different approaches to mine ventilation control have been developed: ventilation on demand (VOD) and automatic ventilation control (AVC) systems. The latter was primarily developed in Russia and the CIS countries. This paper presents a comparative analysis of these two approaches; it was concluded that the approaches have much in common. The only significant difference between them is the optimal control algorithm used in automatic ventilation control systems. The paper describes in greater detail the algorithm for optimal control of ventilation devices that was developed at the scientific school of the Perm Mining Institute with the direct participation of the authors. One feature of the algo-rithm is that the search for optimal airflow distribution in the mine is performed by the system in a fully automated mode. The algorithm does not require information about the actual topology of the mine and target airflows for the fans. It can be easily programmed into microcontrollers of main fans and ventilation doors. Based on this algorithm, an automated ventilation control system was developed, which minimizes energy consumption through three strategies: automated search for optimal air distribution, dynamic air distribution control depending on the type of shift, and controlled air recirculation systems. Two examples of the implementation of an automated ventilation control system in potash mines in Belarus are presented. A significant reduction in the energy consumption for main fans’ operation obtained for both potash mines.
    Źródło:
    Archives of Mining Sciences; 2020, 65, 4; 803-820
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Developmental features of non-urban areas using local peat resources in a sustainable way
    Autorzy:
    Semin, Alexander N.
    Grevtsev, Nikolay V.
    Antoninova, Natalya Yu.
    Powiązania:
    https://bibliotekanauki.pl/articles/1841964.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    non-urban area
    peat
    spatial development
    strategic planning
    Opis:
    The article discusses the spatial development of non-urban areas based on the use of local peat resources. Creating a methodology for the advanced spatial development of non-urban areas has peat resources based on multi-criteria optimisation of production and social infrastructures. The industrial and social infrastructure of the non-urban areas having reserves of peat, associated mineral, and industrial raw materials. Regularities, trends, and features of formation and functioning of the productive and social infrastructure of the natural and man-made complex in the development of peat reserves, associated mineral, and industrial raw materials. To achieve this goal, it is necessary to conduct interdisciplinary research and solve the following specific objectives: (1) the scientific justification of new technological processes and equipment for peat and mineral raw materials processing for obtaining new composite materials for multiple purposes; (2) the feature analysis of the use of local peat resources to provide the development of non-urban areas based on a set of scientific approaches; (3) the development of the methodology for project management of the natural and man-made complex to ensure multi-criteria optimisation of productive and social infrastructure. The example of the Khanty-Mansiysk Autonomous Okrug – Yugra development selected results of confronting the existing “big grand” and national challenges through the mechanisms of rational use of local peat resources non-urban areas are illustrated. The results indicated that by 2030 there would be a 3.8-fold increase in mineral extraction and a 5.9-fold increase in processing industries.
    Źródło:
    Journal of Water and Land Development; 2021, 50; 79-84
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dispersion of Al-Si Alloy Structure by Intensive Pulsed Electron Beam
    Autorzy:
    Konovalov, S.
    Gromov, V.
    Zaguliyaev, D.
    Ivanov, Y.
    Semin, A.
    Rubannikova, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/381713.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    silumin
    structure Al-Si
    electron beam processing
    crystallization cells
    dispersion
    struktura Al-Si
    obróbka wiązką elektronową
    krystalizacja
    dyspersja
    Opis:
    By the method of modern physical material science (optic microscopy scanning and transmission electron microscopy) the analysis of structural phase states, the morphology of the second phase inclusions and defect substructure of Al-Si alloy (silumin) of hypoeutectic composition, subjected to electron beam processing was done with the following parameters: energy density 25-35 J/cm2, beam length 150 μs, pulse number – 3, pulse repetition rate – 0.3 Hz, pressure of residual gas (argon) 0.02 Pa. The surface irradiation results in the melting of the surface layer, the dissolution of boundary inclusions, the stricture formation of high speed cellular crystallization of submicron sizes, the repeated precipitation of the second phase nanodimentional particles. With the increased distance from the irradiation surface the layer containing the second phase inclusions of quasi-equilibrium shape along with the crystallization cells was revealed. It is indicative of the processes of Al-Si alloy structure globalization on electron beam processing.
    Źródło:
    Archives of Foundry Engineering; 2019, 2; 79-84
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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