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1
Content available Influence of casting parameters on fatigue properties of the ŻS6U-WI alloy
Tomczak Anna
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
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2021
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z. 93 [302]
53--64
EN
The hot parts of aircraft engines are made of nickel-based superalloys and work in extremely difficult conditions. The compressor blades mentioned in the article are usually produced by a casting process whose parameters have a great influence on the fatigue properties of the end product. The parameters of the casting process have significant influence on the microstructure, i.e. phase components morphologies. The article presents the results of the analysis of microstructures of nickel superalloys and the influence of casting parameters on the fatigue strength of finished products. The casting parameters were selected experimentally. The work included analysis of the microstructure of semifinished products and high-cyclic fatigue strength tests of the final product.
2
Content available remote CT inspection of cooled turbine blades
Przysowa Radosław, Chalimoniuk Marek, Grzelka-Gajek Danuta, Shakalo Ruslan, Karpenko Artem
Journal of KONBiN
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2020
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Vol. 50, iss. 3
307--331
EN
To improve the engine efficiency by increasing the gas temperature, multi-layer cooling passages are applied in new designs of gas turbine blades. As a result, traditional non-destructive methods, which have been applied so far in the production control, became insufficient. The aim of this manuscript is to develop an inspection method for cooling passages of turbine blades, which would be helpful in detecting manufacturing defects of blades and their operational failures. GE v/tome/x/m 300 was applied to conduct dimensional control and check the interior of two types of turbine blades from turboshaft engines. The procedure for selecting X-ray parameters was suggested. The thickness of walls in the selected cross-section was measured with the accuracy of 0.01 mm, and the selected manufacturing defects of cooling passages were identified.
PL
W celu zwiększenia sprawności silników przez podniesienie temperatury gazów, w nowych konstrukcjach łopatek turbin gazowych stosuje się wielowarstwowe zespoły kanałów chłodzących. W efekcie, tradycyjne metody nieniszczące, stosowane dotychczas w kontroli produkcji stają się niewystarczające. Celem pracy jest opracowanie metodyki inspekcji kanałów chłodzących łopatek turbin do wykrywania wad produkcyjnych łopatek oraz ich uszkodzeń eksploatacyjnych. Zastosowano tomograf GE v/tome/x/m 300 do kontroli wymiarowej i sprawdzenia poprawności wykonania wnętrza dwóch typów łopatek turbiny silnika turbowałowego. Zaproponowano procedurę doboru parametrów prześwietlania. Zmierzono grubość ścian w wybranych przekrojach z dokładnością 0,01 mm oraz zidentyfikowano wybrane wady produkcyjne kanałów chłodzących.
3
Content available Application of Modified Cores for Grain Refinement in Castings of Aircraft Turbine Blades
Binczyk F., Cwajna J., Gradoń P.
Archives of Foundry Engineering
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2017
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Vol. 17, iss. 3
19--22
EN
Paper presents the results of research on modified surface grain refinement method used in investment casting of hollow, thin-walled parts made of nickel based superalloys. In the current technology, the refining inoculant is applied to the surface of the wax pattern and then, it is transferred to the ceramic mould surface during dewaxing. Because of its chemical activity the inoculant may react with the liquid metal which can cause defects on the external surface of the cast part. The method proposed in the paper aims to reduce the risk of external surface defects by applying the grain refiner only to the ceramic core which shapes the internal surface of the hollow casting. In case of thin-walled parts the grain refinement effect is visible throughout the thickness of the walls. The method is meant to be used when internal surface finish is less important, like for example, aircraft engine turbine blades, where the hollowing of the cast is mainly used to lower the weight and aid in cooling during operation.
4
Content available remote The Development of High-Efficiency Turbine Blades
Vomela J., Milcak P.
Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
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2005
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nr 128, vol. 2
557-564
EN
This document describes an experimental device as well as methods employed in and results obtained by measuring the flow of air through turbine stages. Experiments have been conducted using a single-stage turbine. Efficiency has been measured separately for stators equipped with prismatic, lean, compound lean and compound twist blade configuration. The loss coefficient has been determined for all four stator setups. The most suitable setup has been identified after comparing all available measurement results.
5
Content available remote Extended Reynolds Analogy Coefficients of a Heated Flat Plate in Instationary Flow
Wierciński Z., Kaiser M.
Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
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2005
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nr 128, vol. 2
581-588
EN
The investigation of the extended Reynolds analogy of the transitional boundary layer on the heated flat plate with different onflow condition was carried out. The coefficients of intermittency were determined on the basis of the tree-parametric cumulative distribution function of Weibull using the local shear stress Cf and Stanton number St distributions along the plate. For the unsteady flow with wakes the extended Reynolds number coefficient s is equal to 1.10 while for the flow without unsteadiness it is equal to 1.0. Finally, the formula was proposed for the Prandtl number distribution in the region of laminar-turbulent transition.
6
Content available remote Microwave homodyne system application in turbine blades diagnostics
Szczepankowski A., Dzięcioł E.
Prace Instytutu Lotnictwa
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2003
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z. 1-2 (172-173)
59-62
EN
The paper has been intended to present some selected issues of taking measurements of rotating components under extreme operating conditions, in particular at high temperature. Tests have been suggested with microwave detector of motion applied, one that cooperates with systems using both 1 the homodyne detection of a high frequency signal and the frequency-based measurement of time intervals. Fundamental technical problems of the method while taking measurements on a real object have also been indicated.
PL
Celem publikacji było zaprezentowanie wybranych zagadnień wykonywania pomiarów wirujących elementów w ekstremalnych warunkach eksploatacyjnych, a w szczególności przy wysokich temperaturach. Zaproponowano badania z zastosowaniem mikrofalowego detektora ruchu, współpracującego z systemami: detekcji homodynowej sygnału wysokiej częstotliwościowego i pomiaru odcinków czasu metodą częstotliwościową. Omówiono także podstawowe techniczne problemy metody istniejące podczas pomiarów na rzeczywistym obiekcie.
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