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Numerical prediction of GTD-350 turboshaft engine combustor deterioration

Chmielewski M., Fulara S., Gieras M.

Journal of KONES

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2017

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Vol. 24, No. 2

47--58

EN

The aim of this article is to describe the use of Computational Fluid Dynamics (CFD) model for turboshaft combustor chamber deterioration analysis. To show advantages of the proposed approach the test bench of GTD-350 turboshaft engine operating at the Institute of Heat Engineering, Warsaw University of Technology was used as an example. The CFD modelling of the reactive flow inside 40º sector of GTD-350 engine section was developed. Proposed modelling technique provides good correlations with experimental data and shows that the combustor front wall soot accumulation is clearly related to the fuel droplets residence time and the oxygen mass fraction. The temperature distribution inside the combustion chamber allows concluding on possible hot distress areas on the combustion chamber liner walls. Engine borescope inspection (BSI) of the compressor, combustion chamber, compressor turbine and power turbine is used to correlate model predictions with a real GTD-350 engine deterioration. Very good correlation of the engine BSI observations with the numerical predictions proves usefulness of the developed model. Finally, advantages and future applications of the developed model are discussed.

2

Miniature gas turbine with Variable Area Nozzle

Fulara S., Gieras M., Chmielewski M.

Archivum Combustionis

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2017

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Vol. 37 nr 2

127--138

EN

Current scientific knowledge related to miniature turbochargers and gas generators is still improving. Various concepts are being tested seeking performance enhancement. Variable Area Nozzle (VAN) system is one of them. It aims to optimize effective area nozzle controlling both: turbine entry temperature and mass flow rate. The article presents different variable geometry concepts and recent research on VAN applied to a miniature gas turbine at Warsaw University of Technology. VAN concept and related phenomena are discussed.

3

Theoretical studies of variable geometry : hot section of the miniature jet engine

Chmielewski M., Fulara S., Gieras M.

Journal of KONES

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2016

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Vol. 23, No. 2

69--80

EN

The aim of this article is to present the results of theoretical studies regarding the use of variable geometry hot section of a miniature gas turbine. The variable geometry combustor and variable area nozzle concepts for GTM-120 miniature jet engine are presented in particular. Recent trends of propulsion system size reduction, low-emission combustion and improved fuel efficiency have been considered. A system of variable geometry combustor and variable area nozzle has been proposed as solution. The basic zero-dimensional analytical models for variable geometry combustor and variable area nozzle are developed. Chemkin based model shows significant NOX/CO emissions reduction and combustor outlet enthalpy increases with the use of variable geometry combustor chamber. The analytical model of the variable area nozzle has been proposed. It shows turbine effectiveness increase across its operating range by raising the compressor working line. As a result, noticeable turbine stage efficiency increase has been obtained. Finally, physical implications and future work plans regarding variable geometry hot section of miniature gas turbines are discussed.