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1
Content available Numerical simulation of thermally loaded aircraft engine turbine blade covered with thermal barrier coating - TBC
Łazarczyk M., Domański R.
Journal of KONES
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2012
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Vol. 19, No. 3
271-277
EN
The objective of this thesis is to present the impact of the turbine blade cooling on blade material temperature as well as to assess advantages and disadvantages of applied cooling method (TBC coating combined with internal cooling). To calculate the conjugated heat transfer analysis generating 3d model and mesh of the blade and its cooling was required. Model mesh was covered with boundary layer in order to properly simulate conditions near the blade walls and obtain accurate results. Calculated blade was put in the canal simulating hot combustion gasses flow. Geometry of model described above was created using Unigraphics NX5 program based on drawings obtained from available literature, and data acquired from the Internet. The discretization was done in commercial pre--processor GAMBITŽ. Conjugated heat transfer analysis was conducted in program FLUENTŽ for two different cases, where the TBC material properties were changed. The goal of this thesis was to obtain temperature fields and distribution in the turbine blade airfoil and to evaluate if applied cooling is sufficient to cool down this thermally loaded part of the engine. Calculated results show that proposed blade heat protection with TBC and internal cooling canal is insufficient during steady state condition, especially on the blade leading and trailing edge. In these two locations, the TBC coating is overheated, and the high temperature level of blade material is unacceptable for materials used in jet engine turbine industry.
2
Content available remote Influence of graphite on electrical properties of polymeric composites
Szczepanik M., Stabik J., Łazarczyk M., Dybowska A.
Archives of Materials Science and Engineering
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2009
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Vol. 37, nr 1
37-44
EN
Purpose: of this work was to prepare polymeric composite materials with different contents of graphite and to search the influence of graphite on electrical properties of these materials. Design/methodology/approach : Five specimens were prepared using gravity casting method. Composites with epoxy resin as a matrix and with respectively 3, 6, 9 and 12%vol of graphite PV60/65 as a filler were cast. Surface resistivity was applied as a measure of electrical properties. The idea of the test was to define electrical resistivity in sequential layers with different content of conductive component (graphite). First, specimen's thickness was measured and electrical resistivity was tested. Next, outer layer was removed by grinding and electrical measurements performed. The procedure was repeated for all subsequent layers. In effect surface and volume resistivity dependence on depth of the layer was determined. Findings: The experimental results demonstrated that addition of conductive filler (graphite) to epoxy resin caused change of surface and volume resistivity of these materials. Research limitations/implications: Further investigations with higher carbon content and/or with different matrix are needed. Practical implications: Addition of 3-6%vol. of graphite to epoxy resin caused limited, almost linear, decrease of surface resistivity in depth direction of specimens. Higher content of filler (9-12%vol) in polymeric composite caused rapid, non-linear with layer depth, decrease of surface and volume resistivity. Originality/value: This paper is original because in the research programme gravitational casting was used to prepare polymeric composite materials with gradient of electrical properties.
3
Content available remote Oxygen accumulation rate with and without live bacteria in column bioreactors
Kawalec-Pietrenko B., Łazarczyk M.
Chemical and Process Engineering
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2008
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Vol. 29, z. 4
909-921
EN
The process of oxygen accumulation in external loop airlift reactors was investigated. The reactors with the inverse fluidized bed in the downcorner, with the fluidized bed in the riser and with circulating suspension were used. Influences of the gas flow rate and the solid loading on the oxygen accumulation rate were investigated. Experiments were carried out in reactors with and without bacteria Acinetobacter calcoaceticus immobilized on the solid carrier particles.
PL
Badano akumulację tlenu w reaktorach airlift z cyrkulacją zewnętrzną. Stosowano reaktory z odwrotną warstwą fluidalną w strefie opadania, warstwą fluidalną w strefie wznoszenia oraz reaktor z cyrkulującą zawiesiną. Badano wpływ prędkości przepływu powietrza oraz stężenia cząstek stałych na szybkość akumulacji tlenu w cieczy w reaktorach nie zawierających bakterii oraz w obecności bakterii Acinetobacter calcoaceticus immobilizowanych na stałych cząstkach nośnika.
4
Content available remote Strącanie węglanu wapnia w kolumnowym reaktorze barbotażowym z Co2 jako reagentem
Kawalec-Pietrenko B., Konopacka-Łyskawa D., Ługowska J., Gryszko J., Łazarczyk M.
Prace Naukowe Instytutu Inżynierii Chemicznej Polskiej Akademii Nauk
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2006
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nr 7
73-84
PL
Badano przebieg procesu precypitacji węglanu wapnia z roztworu wodorotlenku wapnia za pomocą dwutlenku węgla w reaktorze typu airlift. Zbadano wpływ czasu nagazowania, prędkości przepływu dwutlenku węgla i prędkości przepływu mieszaniny dwutlenku węgla i powietrza na wielkość otrzymywanych cząstek. W czasie procesu mierzono zmiany pH mieszaniny reakcyjnej oraz stopień zatrzymania gazu.
EN
Calcium carbonate particles have been obtained in the reaction ofcalcium hydroxide with carbon dioxide m the intemal loop airlift reactor. Influence of the time of the proces, the velocity of carbon dioxide and the yelocity of carbon dioxide - air mixture on the precipitated particle diameter have been mvestigated. pH value and gaś hold-up in the reactor have been measured during precipitation.
5
Zmienna podczas biodegradacji minimalna prędkość fluidyzacji w bioreaktorze z odwrotną warstwą fluidalną
Kawalec-Pietrenko B., Łazarczyk M.
Inżynieria i Aparatura Chemiczna
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2006
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Nr 6s
116-117
EN
It was found that the minimum fluidization velocity of the bed of carrier-biofilm agglomerates decreased during the butanol biodegradation. The experimental dependence for prediction of the minimum fluidization velocity was proposed. The time-dependent agglomerate mean density and the thickness of biofilm were determined.
6
Wpływ obecności bakterii na szybkość wnikania tlenu w reaktorze airlift do oczyszczania ścieków z substancji organicznych
Kawalec-Pietrenko B., Łazarczyk M.
Inżynieria i Aparatura Chemiczna
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2006
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Nr 5s
61-64
EN
Experimental results of the oxygen transfer rate are presented for an external-loop airlift reactor with the inverse fluidi- zed bed created by solid carrier particles without and with immobilized bacteria A. calcoaceticus. The influence of the air flow rate and initial height of solid particles bed on the oxygen transfer rate in the reactor with and without bacteria is discussed.
7
Szybkość wnikania i konsumpcji tlenu w kolumnowych reaktorach barbotażowych z zawiesiną drożdży
Kawalec-Pietrenko B., Konopacka-Łyskawa D., Łazarczyk M.
Inżynieria i Aparatura Chemiczna
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2006
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Nr 6s
114-115
EN
An influence of the air flow rate and concentration of active and inactivated Saccharomyces cerevisiae yeasts on the oxygen transfer rate in the bubble column and the external loop airlift reactor is presented.
8
Zastosowanie reaktora airlift z odwrotną warstwą fluidalną do biodegredecji dimetyloketonu
Kawalec-Pietrenko B., Łazarczyk M.
Inżynieria i Aparatura Chemiczna
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2004
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Nr 2
3-5
PL
Badania prowadzono w reaktorze airlift z zewnętrzną cyrkulacją. Jako ścieki modelowe zastosowano wodne roztwory dimetyloketonu. Złoże fluidalne tworzą cząstki spienionego polistyrenu, na których unieruchomione są bakterie tlenowe Acinetobacter calcoace-ticus. Zbadano wpływ parametrów procesowych na czas biodegradacji dimetyloketonu.
EN
Ketone biodegradation was carried out in an air-lift reactor with outer circulation. Aerobic bacteria Acinetobacter calcoaceticus were immobilized on foamed polystyrene particles forming a fluidized bed in the settling range. An influence of air velocity, bacteria - acetone solution contact time and hydrogen ions concentration on biodegradation time of dimethyl ketone was investigated.
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