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Impact of work of turbine adaptive engines for the natural environment

Ćwik D., Kowalski M., Steżycki P.

Journal of KONES

2018

Vol. 25, No. 4

509--516

The article describes the problem of the operation of turbine jet, adaptive engine work on the natural environment. In particular, the analysis of noise generated by turbine jet engines has been made. It points out possible directions of noise decrease with particular emphasis upon structural changes within the engines, the task of which is to reduce the noise mission. The example of the modernization is based upon the “bypass” type of one-flow turbine jet engine. The essay contains theoretical basis of calculation of the noise emission level and the results, which graphically indicate a relative level of noise of this type of engine depending upon the amount of discharged air and the diameter of the discharge nozzle and the radius, upon the basis of which the noise level is determined. This work also includes a comparison of the relative noise level of this type of engine with regard to one-flow turbine engine equipped with the function of air discharge to the environment and with regard to two-flow turbine jet engine equipped with air stream flow mixing device. The use of low-emission combustion chambers in the "bypass" turbine engine was indicated. This allowed addressing the problem of emissions of toxic exhaust components by this type of aircraft engines. At the same time, the dependence of this emission related to the mass of fuel used on the engine's thrust range was indicated. The article was concluded with a short summary.

Komputerowa analiza dynamiki turbiny silnika odrzutowego

Freundlich J., Jachimowicz J.

Systems : journal of transdisciplinary systems science

2002

Vol. 7, No. 1 sp.

182-191

W pracy przedstawiono obliczenia dynamiki turbiny silnika odrzutowego z zastosowaniem MES. Obliczono częstości i postacie drgań pojedynczej topatki turbiny silnika odrzutowego dla modelu trójwymiarowego. Następnie zbudowano uproszczony belkowy model łopatki turbiny. Model ten został wykorzystany do obliczeń częstości i postaci drgań całej turbiny. Obliczenia zostały porównane z badaniami doświadczalnymi.

In the paper, calculations of dynamic of a turbo-jet engine turbine using the FEM are presented. Natural frequencies and mode shapes of a single turbine blade for a three-dimensional model were calculated. The next, a simplified beam model of a turbine blade was formed. The model was utilized for calculation of natural frequencies and mode shapes of a entire turbine. The calculations were compared with the experimental examinations.