Temat: SI engine - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: In-cylinder combustion analysis of a SI engine fuelled with hydrogen enriched compressed natural gas (HCNG) : engine performance, efficiency and emissions
Autorzy:: Juknelevičius, R.
Mehra, R.K.
Ma, F.
Szwaja, S.
Tematy:: hydrogen
CNG
SI engine
combustion
emission
MFB; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/245683.pdf Link otwiera się w nowym oknie
Opis:: The main objective of this study was to investigate the effect of hydrogen addition on spark ignition (SI) engine’s performance, thermal efficiency, and emission using variable composition hydrogen/CNG mixtures. The hydrogen was used in amounts of 0%, 20%, 40% by volume fraction at each engine speed and load. Experimental analysis was performed at engine speed of 1200 rpm, load of 120 Nm corresponding BMEP = 0.24 MPa, spark timing 26 CAD BTDC, and at engine speed of 2000 rpm, load of 350 Nm corresponding BMEP = 0.71 MPa, spark timing 22 CAD BTDC. The investigation results show that increasing amounts of hydrogen volume fraction contribute to shorten ignition delay time and decrease of the combustion duration, that also affect main combustion phase. The combustion duration analysis of mass fraction burned (MFB) was presented in the article. Decrease of CO2 in the exhaust gases was observed with increase of hydrogen amounts to the engine. However, nitrogen oxides (NOX) were found to increase with hydrogen addition if spark timing was not optimized according to hydrogen’s higher burning speed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: New diagnostic methods of alternative LPG/CNG injection systems
Autorzy:: Flekiewicz, B.
Flekiewicz, M.
Tematy:: CNG
LPG
SI engine
maintenance
fuel injection; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/242343.pdf Link otwiera się w nowym oknie
Opis:: Diagnostic methods of gas alternative feeding systems were presented in this paper. Methods of validation for properly cooperation between OEM petrol systems and gas injection system were described. Procedures allowing the analysis ofproper operation of both petrol and alternative feeding systems were presented. A detailed study has been done on seąuential injection system, as a solution fulfilling restricted requirements of new SI engines. Obtaining both satisfactory emission reduction level and minimal power drop for alternative engine gas operating is only possible with all diagnostic procedures especially ones connected with system prototyping phase being done with high precision equipment characterized by low inertia of transducers. Sensors output signals reąuire acquisition with the use of more complex and faster systems. Proper choice of test equipment at each step, guarantees repeatability and what results also reliability ofrealized diagnostic procedures. Influence of alternative gas fuelling systems on mixture adaptation, transfer function, diagnostic methods for prototyping phase, diagnostic procedures for alternatively powered vehicle operation, diagnosis of sequential gas injection system during normal system maintenance are presented in the paper.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: An attempt of exhaust gases composition prediction in si engines powered by petrol and gaseous fuels
Autorzy:: Flekiewicz, M.
Kubica, G.
Flekiewicz, B.
Tematy:: CNG
LPG
exhaust gases
SI engine
combustion analysis; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/245747.pdf Link otwiera się w nowym oknie
Opis:: Optimization procedure of the si engines feeding systems requires the application of newer and more sophisticated tools, as an addition to well known but expensive experimental methods. Numerical methods can be considered nowadays as once playing the most important role in the combustion process analysis. Paper describes the application of the dual zone model, allowing the analysis of the combustion process in an SI engine with the possibility of estimating 10 different exhaust gases i.e.: CO2, CO, H2O O2, NO, N2, H2, H, O and OH. The research has been carried on a 1.6 litr es four cylinder SI engine, fed with petrol and alternatively with LPG and CNG. In-cylinder pressure for the 4th cylinder of the tested engine has been acąuired for several engine speeds. registered in-cylinder pressure traces p=p((fi), together with the volume variation nii=nii((fi) infunction ofcrank angle, were used in the combustion process simulating calculations. Obtained results made it possible to compare selected parameters describing the combustion process. Obtained results do also prove recognized fact related to the higher temperature necessary to initiate gaseous fuel combustion.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: An influence of correction of the ignition advance angle on the combustion process in SI engine fuelled by lpg with the addition of DME
Autorzy:: Kubica, Grzegorz
Marzec, Paweł
Tematy:: dimethyl ether
DME+LPG
fuel blend
SI engine; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/243249.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the results of tests of the SI engine fuelled by LPG with the addition of DME in the form of a mixture of gaseous fuels. Experimental tests were carried out on a chassis dynamometer in the full range of engine loads, at a fixed rotational speed: 2000, 2500 and 3000 rpm. The use of dimethyl ether (DME) as a fuel component makes it possible to exploit its important advantages. DME can be produced as a renewable fuel, which is important from the point of view of ecology. Another important fact is the presence of oxygen in this fuel, which has a positive effect on the engine volumetric efficiency. During the tests, the ignition timing was also adjusted due to the very good DME flammability. Two additional correction levels were applied, increasing the ignition advance by 3 and 6 CA degrees, compared to the factory settings of the driver. The analysis of the obtained results allowed determining the dependence of the basic engine parameters, in the function of the correction of ignition advance angle. In the summary, attention was also paid to the possibility of determining corrected maps of the ignition advance angle taking into account the variable proportions of fuel components.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Total efficiency of adjustable compression ratio SI engine
Autorzy:: Sendyka, B.
Kula, K.
Kudzia, S.
Soczowka, J.
Tematy:: SI engine
compression ratio
combustion engines
total efficiency; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/242772.pdf Link otwiera się w nowym oknie
Opis:: The following paper includes adjustable ratio spark ignition engine's total efficiency analysis. Main modification of the engine is mounting of crankshaft on eccentric mechanism. Paper presents schemes of eccentric mechanism implemented in developed engine as well as adjustable compression ratio control system's block diagram. Propulsion from stepper motor is transmitted through self-locking worm gear. Value of compression ratio varies from 9.5 to 14. The main input signal for electronic control system is coming from knock-sensor mounted on the engine. If control system doesn't receive that signal it levels up compression ratio. As soon as signal appears ratio mentioned above is reduced by a value 0.05. During the investigation rotational speed of the engine was limited to nterval 1800-4000 [rpm] and throttle was partially closed. Relative increase of Suzuki engine's total efficiency presented in this paper surpasses 30 per cent. The outcome of investigation presents engine with variable compression ratio as a good prospect for the future. Constant adjustment of compression ratio with use of electronical control system allows significant improvement of total efficiency and consequently reducing fuel consumption.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Diagnostics of internal combustion diesel engines operated in construction and mining
Autorzy:: Magdziak-Tokłowicz, M.
Miksiewicz, K.
Reksa, M.
Magdziak, D.
Tematy:: engine diagnostics
construction machines
mining machinery vehicle operation
SI engine; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/241683.pdf Link otwiera się w nowym oknie
Opis:: Mining machinery and equipment belong to the group of special machines working in extreme conditions. Mining machines are used in difficult conditions such as limited supplies of fresh air, heat from the rock, in places with high humidity and heavy dust. In other specifics related to the extraction process is brine, harmful compounds such as sulphur dioxide, or rock debris raining down. The machines are operated in continuous mode, the clock. Working in mining conditions machines are exposed to frequent breakdowns and malfunctions. Identifying of failure diesel engines can be cumbersome in these conditions and time-consuming, leading to longer downtime, thereby reducing operating efficiency and increased cost. Therefore, in the paper was a review and analysis methods for the diagnosis of internal combustion diesel engines used in machines built and used to power machines in underground mining. On the basis of diagnostic testing was performed analysis of cases occurring malfunctions and failures.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Torgas condensate combustion in the SI engine
Autorzy:: Chwist, M.
Szwaja, S.
Grab-Rogaliński, K.
Poskart, A.
Tematy:: SI engine
butanol
bio-oil
torgas condensate
exhaust emission
torrefaction; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/949504.pdf Link otwiera się w nowym oknie
Opis:: The article presents results from IC engine tests on combustion of alcohol fuel with the addition of torgas condensate. Torgas is a by-product created from the torrefaction of Sida hermaphrodita. It was obtained from torrefaction carried out at a temperature of 400°C. Torgas was condensed in a tubular cooler. The basic fuel was butanol. This fuel was chosen, because regular hydrocarbon based fuels got delaminated while blended with torgas condensate. The condensate dissolves in alcohol therefore the choice was justified. In the mixture, the volume ratio of alcohol to condensate was 4:1. The combustion was carried out in a spark-ignition, single-cylinder engine with a cubic capacity of 650 cm3. The engine was able to vary its compression ratio. The engine worked at full load at maximum open throttle. The engine body was heated to a temperature of 95°C and this temperature was maintained throughout the testing period. The engine was running at 850 rpm. The first stage of the experiment included determination of the optimal ignition angle for butanol as a reference fuel and for a mixture of butanol and torgas condensate. The optimal spark angle was estimated based on the maximum indicated work. Three compression ratios, i.e.: CR=8.8, 10 and 11.2 were used. All tests were performed for a stoichiometric air fuel ratio. The obtained in-cylinder pressure diagrams for the reference fuel and the fuel with the addition of condensate were compared with each other. The rate of pressure increase inside the cylinder was calculated. For all tests, the following exhaust components were measured: CO2, CO and HC.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: An influence of methane/hydrogen proportion in fuel blend on efficiency of conversion energy in SI engine
Autorzy:: Flekiewicz, M.
Kubica, G.
Tematy:: methane/hydrogen blend
low-carbon fuel
total efficiency
SI engine; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/246510.pdf Link otwiera się w nowym oknie
Opis:: The relations between methane/hydrogen proportions in fuel blend are presented in this paper. The research cycle carried out contains results of dynamometer chassis tests complemented with mathematical model calculations. An object of X16SZR engine installed in Opel Astra I was investigation. The engine has been equipped with additional CNG feeding system where fuel is being injected into intake manifold under low pressure. 8 fuel blends were tested with variable methane/hydrogen volume proportion (%): 100/0, 95/5, 90/10, 85/15, 80/20, 70/30, 60/40 and 50/50. The feeding and ignition systems were controlled by nominal drivers. In every measuring series engine was tested in the following steady states: on idle, high speed without load and full power at discrete variable speed in range 1500…3500 rpm. The main aspect of the analysis was to identify the influence of hydrogen share on engine parameters such power, fuel consumption, in-cylinder pressure, temperature and exhaust gas composition. Very significant ecological fact possibility of CO2 emission reduction has been identified. Result of increasing content of hydrogen in fuel mixture is engine knocking. Analysis carried out on the basis of results allowed it to the point on methane/hydrogen proportion in fuel blend considering a total efficiency, emission and heat flux in parts of combustion chamber in engine.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Effect of the fuel injection pressure on the combustion process in a PFI boosted spark-ignition engine
Autorzy:: Merola, S. S.
Sementa, P.
Tornatore, C.
Vaglieco, B. M.
Tematy:: PFI SI engine
boosting
fuel injection
fuel deposition
optical diagnostics; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/244891.pdf Link otwiera się w nowym oknie
Opis:: In this paper, low-cost solutions were proposed to reduce the fuel consumption in a boosted port fuel injection spark ignition (PFI SI) engine, taking into account the engine performances and the pollutants emission. To this purpose, the optical characterization of the fuel injection and of the combustion process was carried out in a PFI SI engine. The experiments were performed on a partially transparent single-cylinder SI engine, equipped with a four-valve head and an external boost device. The intake manifold was optically accessible through three holes that allowed the introduction of an endoscope and of optical fibres. The standard injection condition planned by the engine manufacturer was investigated; it consisted in the fuel injection at 3.5 bar when the intake valves were closed. Moreover, the fuel injection with open intake valves was tested; 3.5 and 6.5 bar fuel pressures were studied for open and closed valves conditions. Optical techniques based on 2D-digital imaging were used to follow the fuel injection spray in the intake manifold and the flame propagation in the combustion chamber. The results of in-cylinder optical investigations were correlated with the engine performances and with the exhaust emissions.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Określenie wpływu wyłączania cylindrów silnika ZI na zmiany sygnału wibroakustycznego silnika
Influence of cylinder cutoff on engine vibroacoustics signal
Autorzy:: Sroka, R.
Tematy:: Fiat Panda
silnik ZI
cylinder
sygnał wibroakustyczny
SI engine
vibroacoustic signal; Pokaż więcej
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Powiązania:: https://bibliotekanauki.pl/articles/197289.pdf Link otwiera się w nowym oknie
Opis:: W artykule przedstawiono wyniki badań stanowiskowych silnika ZI samochodu Fiat Panda o pojemności skokowej 1,1 [dm3]. Celem tych badań była ocena wpływu wyłączania cylindra na zmiany sygnału wibroakustycznego silnika.
The results of investigations of Fiat Panda SI engine with 1100 [ccm] are presented in this paper. Research goal was estimate of cylinder cutoff influence on engine vibroacoustics signal.
Dostawca treści:: Biblioteka Nauki

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