Temat: CI–engine - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: The influence of oxygenates on lubricity of fuels for CI engines
Autorzy:: Kulczycki, A.
Tematy:: CI engine
CI engine fuel
lubrication additives
fuel lubricity; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/244244.pdf Link otwiera się w nowym oknie
Opis:: Lubricity of fuels for CI engines becomes one of very important parameter since the sulphur content was decreased to 50 and actually 10 ppm. To provide effective lubrication of fuel pumps and unit injectors elements, in case fuel does not contain organic sulphur compounds, the oxygen containing organic compounds are added as lubrication additives. Biocomponents are usually introduced into mineral diesel fuel containing additives package, which includes lubricating additive (organic acid). The aim of this paper is investigation of the influence of polar oxygenates added to petroleum diesel fuel in concentration between 5 and 20% (V/V) on lubricating additive effectiveness in protective layer creation. The results of HFRR tests obtained for blends of commercial diesel fuel containing lubricating additive with biobuthanol models (MB) leads to conclusion that: − generally the buthanol isomers addition increases wear of upper ball of HFRR apparatus, − wear of upper ball of HFRR apparatus depends on the average film thickness and does not depend on tested fuels viscosity at 40°C, − dilution of commercial diesel fuel by biobuthanol models and consequently decreasing of lubricating additive concentration cannot be the only reason of deterioration of tested blends lubricity. It was concluded, that the possible reason of lubricity deterioration by buthanol added to commercial diesel fuel in concentration between 5 and 20% (V/V) are antagonistic interactions between oxygenates (buthyl alcohol) and lubricating additive. These antagonistic interactions depend on the structure of buthanol isomers.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 2.

Tytuł:: Evaluating combustion, performance and emission characteristics of CI engine operating on diesel fuel enriched with HHO gas
Autorzy:: Rimkus, A.
Pukalskas, S.
Juknelevičius, R.
Matijošius, J.
Kriaučiūnas, D.
Tematy:: CI engine
HHO gas
engine efficiency
emission; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/245953.pdf Link otwiera się w nowym oknie
Opis:: Research of efficient and ecological parameters was carried out with compression ignition (CI) engine using diesel fuel and additionally supplied hydrogen and oxygen (HHO) gas mixture. HHO gas is produced by electrolysis when the water was dissociating. At constant engine‘s brake torque and with increasing HHO gas volumetric concentration in taken air up to 0.2%, engine efficient indicators varies marginally, however, with bigger HHO concentration these parameters becomes worse. HHO increases smokiness, but it decreases NOx concentration in exhaust gas. Numerical analysis of combustion process using AVL BOOST software lets to conclude that hydrogen, which is found in HHO gas, ignites faster than diesel fuel and air mixture. Hydrogen combustion before TDC makes a negative work and it changes diesel fuel combustion process – diesel ignition delay phase becomes shorter, kinetic (premixed) combustion phase intensity gets smaller.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 3.

Tytuł:: Number of measurement cycles and accuracy of engine indication process
Autorzy:: Adamski, W.
Brzozowski, K.
Nowakowski, J.
Tematy:: CI engine
measurement
pressure
statistical analysis; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/243903.pdf Link otwiera się w nowym oknie
Opis:: The results of measurements of instantaneous pressure in the cylinder are most often inputs tofurther calculations of the characteristic parameters of the working cycle of the engine. Many repetitions of measurements always feature a degree of unrepeatability in registered cycles, making determination of the so called representative round difficult. The paper considers the problem of estimating the minimal number of measurement cycles for the registration of pressure in order to obtain a representative course ofpressure in the cylinder of an compression ignition engine. Maximum pressure was adopted as an indicator of cycle repeatability. After excluding systematic errors, repetition ofmaximum pressures recorded in subseąuent measurement cycles were analyzed for fixed load and rotation speed of the engine, defining the coefficient ofvariation CV. subsequently, for selected states of the engine the representativeness of the average maximum pressure depending on the number of measurement cycles averaged was examined. full evaluation of the accuracy of the indication process in relation to the number of averaged measurement cycles reauires also determination of the so called expanded uncertainty of the measurement's result. Further analysis including determination of the expanded uncertainty of the measurement result revealed that pressure course averaging over 20 consecutive cycles of measurement is sufficient to obtain a representative cycle.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 4.

Tytuł:: The Influence of Using Biodiesel Prepared from Cresson Oil on Emissions and Performance of CI Engines
Autorzy:: Imran, Murtdha S.
Saleh, Fouad Alwan
Tematy:: cresson oil
biodiesel
CI engine
emission
performance; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/59114144.pdf Link otwiera się w nowym oknie
Opis:: The experimental study was conducted to investigate the effect of using Cresson oil biodiesel on CI engine emissions and performance. This research aimed to examine how using innovative biodiesel blend formulations made from Cresson oil affected the performance and emissions of CI engines. The proportion of Cresson oil biodiesel added to conventional Iraqi diesel fuel into volume amounted to 10%, 20%, 40%, 60%, 80%, and 100%. The engine compression ratio was set to 18, and the fuel injection timing was set at 23º bTDC. The experiments show that this biodiesel reduces the thermal efficiency, heat release, delay time, and cylinder pressure of the engine while increasing the exhaust temperature (EGT) and brake-specific fuel consumption (BSFC). There has been an increase in emissions of nitrogen oxides (NOX) and carbon dioxide (CO2), in addition to a reduction in emissions of carbon monoxide (CO), soot, and unburned hydrocarbons (HC).
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 5.

Tytuł:: Allometry of nanoparticles in diesel-biodiesel blends for CI engine performance, combustion and emissions
Autorzy:: Ahmed, Mohd Mujtaba
Pali, Harveer Singh
Khan, Mohammad Mohsin
Tematy:: biodiesel
nanoparticle
CI engine
engine performance
engine combustion
exhaust emission; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/59111733.pdf Link otwiera się w nowym oknie
Opis:: Most countries in the world are facing two major challenges, one is the increase in the demand for energy consumption difficult to fulfill because of limited fossil fuel, and the second is the emission norms specified by many countries. Various methods are adopted to reduce emissions from engines but that leads to sacrificing the performance of CI engines. To eradicate this problem in the present study, the nanoparticles like (TiO2) are used with different particle sizes 1030 nm, 3050 nm and 5070 nm induced in B20 (20% biodiesel and 80% diesel) with the constant volume fraction of 100 ppm, and utilized in the diesel engine without any modifications. The results showed that the incorporation of TiO2 nanoparticles improves the combustion of hydrocarbons and reduces the emissions of CO, unburned hydrocarbon concentration, NOx and soot. Moreover, among three sizes of the nanoparticles, those with size 3050 nm showed interesting results with the reduction in brake-specific energy consumption, NOx, smoke and HC by 2.9%, 16.2%, 35% and 10%, respectively, compared to other blends used in the study, and hence the blend with the nanoparticle of size 3050 nm is expected to be a more promising fuel for commercial application in CI engines.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 6.

Tytuł:: Preliminary tests on an integrated laboratory control system for the feeding system of a dual - fuel diesel engine and its load
Autorzy:: Wierzbicki, S.
Śmieja, M.
Piętak, A.
Tematy:: CI engine
engine test bed
CR system
control system
combustion engine tests; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/244419.pdf Link otwiera się w nowym oknie
Opis:: Comprehensive testing of diesel engines currently requires not only a control system for the feeding system of the engine, but also a system ensuring precise control of its load and providing constant measurement conditions. Additionally, it is necessary during the tests to record a considerable number of operating parameters of both the engine and the loading system. The currently available stands for diesel engine tests, the so-called “engine test beds”, are standardly-equipped with special systems controlled using computer applications to ensure the maintenance of the assumed engine operation parameters. For compression-ignition engines, this most often takes place by control of the accelerator pedal position. In this solution, the engine is controlled by the engine controller, which controls the fuel charge based on the measurement of the rotational speed and the accelerator pedal position depending on the assumed control algorithm. The shortcoming of this solution is no possibility of controlling selected fuel feeding parameters, such as fuel pressure or the injection advance angle. This paper presents preliminary tests on an integrated control system for both engine load and the parameters of fuel fed to a compression-ignition engine. The developed control system enables engine test bed control, which, depending on the measurement variant, ensures the maintenance of a constant rotational speed or a constant engine load as well as control of the Common Rail system actuators.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 7.

Tytuł:: Effect of pilot charge size and biogas composition on the operating efficiency of a dual-fuel compression-ignition engine
Autorzy:: Wierzbicki, S.
Śmieja, M.
Mikulski, M.
Piętak, A.
Tematy:: CI engine
biogas
dual-fuel engine
pilot dose
efficiency of engine; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/243597.pdf Link otwiera się w nowym oknie
Opis:: Reduction of greenhouse gases emissions into the atmosphere, as well as increasing the share of renewables in the overall energy balance, forces the search for new, alternative energy sources. One of the fuels, which presents high potential for combustion engines are biomethane or biogas, with methane as the main flammable component. Biogas can be obtained from different products and using a variety of technologies which results in its wide availability and relatively easy manufacture. The largest sources of biogas can be animal farms or sewage treatment plants and waste dumps in which significant quantities of biogas are obtained as a result of naturally occurring processes. Biogas can also be obtained from processing of energy crops or waste processing in agricultural, food and meat processing plants. In this article, the possibility of using biogas as a fuel for CI engines has been examined. In such engine, combustion of biogas (methane) requires the use of dual fuel supply system, in which in addition to methane, liquid fuel is injected into the combustion chamber, in order to initiate the self-ignition of gaseous fuel. The paper presents exemplary results of the impact of the proportion of different fuels and biogas composition on the efficiency of the engine work cycle.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 8.

Tytuł:: Discussion on the methodology of the lubricity determination of diesel fuels, containing non petroleum components
Autorzy:: Dzięgielewski, W.
Tematy:: CI engine
CI fuels
non-petroleum fuel components
fuel tribochemical characteristics; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/949493.pdf Link otwiera się w nowym oknie
Opis:: The paper describes the usability of current test methods employed in fuels for CI engines testing for fuels containing non-petroleum components. The paper describes test results that justify the necessity for test method modification and for establishing new criteria for assessment of such fuels usability. The analysis covered typical courses of friction coefficient and electrical contact potential as film thickness during test. During standard test the wear stages were isolated, and then referenced to actual operation of friction pair in fuel supply system of diesel engine. Test results show that methodology used up to date is not useful. The restriction to standard corrected wear scar diameter (WS 1.4) is not enough for proper interpretation of course and effects of model wear. Moreover, it is impossible to reference to actual operation conditions, which is inconsistent with tribological testing rules. Such rules mean that testing conditions reflect the actual ones as much as possible. Characteristics of test technique using HFRR, discussion on test method usability for testing the modified fuels, lubricity change vs. the increase of concentration of hydrocarbons typical for biohydrocarbons from Fischer-Tropsch process, comparison of changes of friction coefficient and lubrication film thickness for samples are presented in the paper.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 9.

Tytuł:: The concept of the tractor powered by biodiesel and biogas
Autorzy:: Kruczyński, S. W.
Pawlak, G.
Wołoszyn, R.
Tematy:: biogas
dual fuel CI engine
agriculture tractor
sustainable energy; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/241857.pdf Link otwiera się w nowym oknie
Opis:: Agriculture farms, especially animal farms consume a lot of energy. They also have big potential to produce energy by themselves. The production of biogas and its efficient utilisation could meet the need for fuel and energy. The production of biogas on a farm and its utilisation as a fuel could improve its energetic balance and safe some money. The paper describes the possible way of utilisation of upgraded manure biogas as a fuel for compression ignition engine, which is adopted for dual fuelling. The engine is going to be fuelled with vegetable oil ester and biogas produced directly on animal farm. Some calculation of fuel consumption of both fuels and analysis of possible changes of combustion process for dual fuelling mode are presented. There is also described the concept of adaptation of CI engine for agriculture tractor to dual fuelling with vegetable oil ester and biogas. In Poland, there are about 1300 caw farms, 3000 pig farms and about 3500 chicken farms. Taking into account that the production of biogas is efficient and give some profit for minimum 100 caws, 500 pigs or 5000 chickens in the farm, there is together about 7800 farms where production of biogas could be profitable [2]. At the end of 2009 there were only 126 installation for biogas production and they produce 70.88 MW of energy. Biogas is one of the most promising sources of renewable energy because the efficiency of conversion of biomass into fuel is relatively high.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 10.

Tytuł:: Possibilities of research electromagnetic fuel injectors
Autorzy:: Osipowicz, T.
Prajwowski, K.
Tematy:: fuel injector
CI–engine
diagnosing procedure
Common Rail system; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/244263.pdf Link otwiera się w nowym oknie
Opis:: Article discusses issues concerning researching electromagnetic fuel injectors. These fuel system is using in automobiles all the time. Bosch Company declined piezoelectric fuel injectors and reverted to electromagnetic. There are known Denso, Delphi and Bosch electromagnetic fuel injectors. Article describes how to diagnose and repair it. Denso and Bosch fuel injectors have almost the same construction. These objects have very similar repair technology. Despite Denso fuel injectors has not manufacturer official repair technology it is possibility to regenerate it because there are tools and many spare parts available on the market. Article discusses construction and operation presented fuel injectors. There has been shown diagnostic parameters and how to analysis it. Researches have been made in laboratory handle; to research and repair Diesel injection systems. Article describes construction, operating testing and repairing of electromagnetic fuel injectors. The aim of the article is to present the possibilities of researching and repairing electromagnetic fuel injectors. The fuel unit injector testing and repair process is carried out. The tests were conducted in a specialist laboratory where fuel injectors, fuel unit injectors and fuel injection pumps are being regenerated. The setting of the opening pressure of fuel unit injector is a very important stage because it affects the volume of injection doses. The opening pressure of fuel unit injector should amount to 28 MPa. F
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Informacja

Wyszukujesz frazę "CI–engine" wg kryterium: Temat