Autor: Krol, B. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The effect of adding 2-ethylhexanol to jet fuel on the performance and combustion characteristics of a miniature turbojet engine
Autorzy:: Gawron, B.
Białecki, T.
Król, A.
Powiązania:: https://bibliotekanauki.pl/articles/247180.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: alternative fuels
alcohol to jet
combustion process
miniature jet engine
exhaust emission
paliwa alternatywne
proces spalania
miniaturowy silnik odrzutowy
emisja spalin
Opis:: There are currently many studies undergoing in the field of using alternative fuels for supplying different types of propulsion units. The ASTM standard in the aerospace industry, allows using five different technologies of manufacturing synthetic components apart from standard oil-based fuel for the propulsion of turbine engines (as a blend up to 50% with conventional fuel). One of these is a technology associated with the process of converting alcohols (isobutanol) to jet fuel – Alcohol to Jet (ATJ). In the research performance, emission parameters were measured on laboratory test rig with miniature turbojet engine (MiniJETRig). The test rig has been created in Air Force Institute of Technology for research and development works aimed at alternative fuels for aviation. The miniature engine was fuelled with conventional jet fuel – Jet A-1 and blend of Jet A-1 with 2-ethylhexanol. The results for this blend were compared with the results obtained for neat Jet A-1 fuel in terms of different engine operating modes, according to specified methodology. The conducted tests did not show significant differences in engine operating parameters (thrust, fuel consumption and thrust specific fuel consumption) and the values of CO, CO2 and NOx emission indices between the tested fuels. The engine tests took place in similar ambient conditions. Laboratory tests of selected physicochemical properties were also carried out for both fuel samples.
Źródło:: Journal of KONES; 2018, 25, 1; 101-109
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The development of the lubricants applied in the porous bearings
Autorzy:: Król, A.
Giemza, B.
Kałdoński, T.
Powiązania:: https://bibliotekanauki.pl/articles/247881.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: porous bearings
lubricants
selection of lubricants
development
Opis:: In the article the development process of lubricants applied to the porous sliding bearings is described and characterised. Porous bearings are widely used in mechanical vehicles, household appliances and manufacturing equipment. However their application to tribological pairs is believed to be limited because of their properties and features such as small resistance to edge and dynamic loads, ability to work only at small sliding velocity. For the last twenty years intensive research under the development of the porous bearings has been observed and newly designed porous bearings have occurred. In that process also lubricants were developed. As the result the range of used lubricants is wider and also their chemical constitution was changed from the mineral oils to the synthetic bases giving better resistance on aging process and better rheological characteristics. Each group of lubricants was characterised and the problems of lubricant selection and application were described. In the article it was also noticed that especially the Polish manufacturers of porous materials do not regard the problem of lubricant selection seriously. Finally, it was summarised that wider selection of new lubricants for the porous bearings enables proper design of the tribological pair for the future work conditions.
Źródło:: Journal of KONES; 2007, 14, 3; 311-317
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The research of oil properties after durability tests of porous bearings
Autorzy:: Król, A.
Giemza, B.
Kałdoński, T.
Powiązania:: https://bibliotekanauki.pl/articles/244133.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: porous bearings
mineral oil
synthetic PFPE oil
aging process
Opis:: Self-lubricating bearings are characterized by sileni-running work, long durability, and high load-carrying capacity at small sliding velocities. Durability of porous sliding bearings is one of the most important parameter determiningfuture implementation. However, during operation loss of self-lubricating capability of the bearing can be caused by aging process of lubricant, what could lead also to decreasing of the durability. Oil aging process could be much deeper than in conventional sliding bearings with solid bushes, because of temperature, catalyst metal - porous stutcture and oxygen accelerating oxidation of oil. It was preliminary confirmed in the previous research that after durability tests of porous bearings high values of total acid number (TAN) of oils samples were achieved. Infrareds (IR) spectrums were also deeply changed. Thus the same investigation was performed for two other different oils (mineral gear oil and perfluorinatedpolyether - PFPE). After the durability test oil samples were unsaturated from the bearings and IR spectrums and TAN were examined. As it appeared change of mineral gear oil properties were not very deep. On the other hand synthetic PFPE oil had high TAN values and significant differences in the IR spectrums were observed.
Źródło:: Journal of KONES; 2009, 16, 1; 289-295
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The effect of laser surface modification on permeability and load capacity of porous sleeves
Autorzy:: Gocman, K.
Kałdoński, T.
Król, A.
Giemza, B.
Powiązania:: https://bibliotekanauki.pl/articles/248012.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: porous sleeves
iron sinter
laser-made micro-segments
Opis:: In this article some results of the research on the new generation slide porous bearings sintered from Höganas NC.100.24 iron powder, with 2.5% addition by weight of copper, with micro-segments (paths) made on their sliding surface with CO2 laser, with increased hardness and locally reduced surface porosity, are presented. The research was carried out within the framework of PBR/15-249/2007/WAT-OR00002904 Research Project financed by the Ministry of Science and Higher Education, during 2007 – 2011 [1]. Significant increase of the load capacity of the porous sleeves with paths, in comparison with the same Ø25/Ø35 x 20 mm sleeves without paths, was obtained. Durability of the bearings was also slightly higher; however, in comparison with the sleeves with macro-segments made of solid material, durability of the new generation bearings was several times higher. The sleeves sintered from iron powder with micro-segments made on their surface with the laser technique have not been previously known. Promising results in terms of increase of load capacity and durability caused that authors decided to submit a proper patent claim to the Polish Patent Office [2].
Źródło:: Journal of KONES; 2015, 22, 1; 107-114
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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