Wyniki wyszukiwania - BazTech

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Application of Laboratory Tests in Numerical Analysis for Exhaust Emissions in Business Jet Engines

Kozakiewicz Adam, Kołodziejska Aleksandra, Kieszek Rafał

Advances in Science and Technology. Research Journal

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2023

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Vol. 17, no 4

21--35

EN

This article deals with the exhaust emissions from aircraft turbine engines, which is related to the rapidly growing market for this type of aircraft and its contribution to toxic emissions. The test carried out was done on a business jet turbine engine exhaust pollutants. The test object was the DGEN 380 engine. In order to determine the toxic composition of the exhaust gas as a function of the engine's operating range, an experiment related to the actual engine was conducted in the first stage. The test performed on the static thrust stand of the DGEN 380 turbine engine provided the necessary data on the parameters of the working medium for further research. The actual rotational characteristics of the engine were obtained. It was also determined numerically using GasTurb software. A high correspondence between experimental and calculated parameters was obtained, which gave the possibility of using them in further analyses of the exhaust gas pollutants of the studied engine. The correspondence of the results showed the correctness of the computational model built, thus predestining it for use in further analysis. This paper presents a model of the reverse-flow combustor made for numerical thermal-fluid studies. The thermal-fluid analysis of the model was performed in the ANSYS Fluent environment. The calculations were performed for three shaft speed. The numerical analysis provided information on changes in pollutant components of the exhaust gas of the DGEN 380 aircraft turbine engine as a function of changes in the shaft speed range. The results showed that the levels of nitrogen oxides depend greatly on shaft speed. The model built and the numerical analyses conducted also provided information about the zones inside of liner casing that affect significantly the amount of pollutant compounds obtained, which can then be used in the work on improving the design in terms of reducing the engine exhaust pollutants.

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Wybrane problemy materiałowych badań łożysk tocznych przystosowanych do pracy w podwyższonych temperaturach

Łęczycki K.

Przegląd Komunikacyjny

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2018

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R. 73, nr 9

17--22

PL

Łożyska toczne wykorzystywane w budowie turbinowych silników lotniczych są jednym z krytycznych elementów w ich konstrukcji, przez co uszkodzenie łożysk może w najgorszym przypadku może doprowadzić do katastrofy lotniczej. Dlatego ważne jest, aby wyjaśniać oraz eliminować przyczyny ich awarii. W niniejszym opracowaniu omówiono wybrane materiałowe badania dwóch uszkodzonych w latach 2016 i 2017 łożysk tocznych z silników turbinowych jednego typu lekkiego śmigłowca. Przedstawiono wyniki badań makroskopowych, mikrostruktury, twardości oraz składu chemicznego. Uzyskane wyniki porównano z badaniami z lat wcześniejszych.

EN

Rolling bearings are crucial component of aviation turbine engines. Bearing failure may, in worst case, lead to an engine failure and aircraft disaster. Therefore, investigation of their causes and subsequent risk factors elimination are of utmost importance. In the present study, selected materials testing issues of two rolling bearings from light rotorcraft turbine enignes failures (in accidents of 2016 & 2017) are discussed. Results of macroscopic, hardness tests, microstructure and chemical assay are presented. The obtained data are compared with results of previous studies on the subject.

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Method of preliminary evaluation of biocomponents influence on the process of biofuels combustion in aviation turbine engines

Kaźmierczak U., Kulczycki A.

Journal of KONES

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2017

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Vol. 24, No. 4

83--90

EN

The aim of this article is presentation of the new method of preliminary evaluation of biocomponents influence on the process of biofuels combustion in aviation turbine engines. This method is based on the tests of evaluated biofuels on engine stand MiniJetRig equipped with small turbine engine. The idea of this new method is to compare the combustion process of evaluated biofuel with the combustion of reference fuels. The reference fuel used in presented research was mineral Jet A1. Two compositions of pure hydrocarbons were blended with Jet A1 fuel and tested using MiniJetRig. The main criterion of combustion process assessment was CO concentration in exhaust gases. As the final criterion of evaluated biofuel the ΔCO = [COWx – COJet] was adopted, where COWx – the concentration of CO in exhaust gases emitted during combustion of evaluated fuel and COJet – the concentration of CO in exhaust gases emitted during combustion of Jet A1 fuel. This method was preliminary verified using HEFA biofuel previously accepted for aviation application. The obtained results qualify this biofuel as similar to Jet A1 ones – the DCO was within limits –30 – +20. The presented method needs further research, using much more evaluated fuels, to confirm their usefulness for laboratory pre-selection of new biofuels.

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Zastosowanie analizy modalnej do diagnozowania lotniczych silników turbinowych

Chachurski R., Nowotarski I.

Biuletyn Wojskowej Akademii Technicznej

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2002

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Vol. 51, nr 8

73-92

PL

W artykule zaprezentowano wyniki badań nad możliwością zastosowania analizy modalnej do diagnozowania lotniczych silników turbinowych. Przedstawiono rezultaty symulacji komputerowych w zakresie dostrajania modeli MES oraz lokalizacji uszkodzeń mechanicznych przy zastosowaniu analizy modalnej.

EN

The authors proposed an algorithm for updating the Finite Element Model method model and for identification of structural damages in the aircraft gas turbine engine using modal analysis. The algorithm is demonstrated using numerical data of the hypothetical rotor and data of the Klimov RD-33 turbofan. The work presents a testing procedure and the results of updating and identification processes.