Abstract The components of modern jet engines represent state-of-the-art technologies. Their technological complexity results in costly components and thus expensive spare parts. Therefore, one of the main goals during the regeneration of jet engines is to repair, rather than replace, the components. So far, defects are mostly detected after a complete disassembly of the engine and an individual inspection of each component. One approach to reduce the costs of the regeneration process, therefore, is to acquire the information necessary for planning at an early stage and particularly before the disassembly of the jet engine. This approach requires new measurement methods. The present paper shows the Background-Oriented-Schlieren (BOS) method to be a promising contribution towards achieving this goal. Every defect in the hot gas path of a jet engine has a direct influence due to changes in the local temperature on the density of the flow. The BOS method provides a three-dimensional measurement of the density distribution in the exhaust jet. The localization and identification of non-uniformities in this distribution can be used to identify defects within the hot gas path. A three-dimensional unsteady CFD-simulation of the full annulus of a five-stage low-pressure turbine as well as a steady calculation of the exhaust jet is used to identify the signature in the exhaust density distribution of typical defects. As prototypical hot gas path defects, temperature variations at the inlet of the turbine were used to demonstrate that temperature non-uniformities can be detected with BOS. Hence, BOS measurements can be used for the identification of defects modeled a priori by CFD within the hot gas path before the disassembly of a jet engine. A methodology for evaluating the limits of detectability of non-uniformities with BOS is also provided.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Methodology for evaluating hot gas path defects in an exhaust jet


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    2014-08-27


    Format / Umfang :

    8 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Methodology for evaluating hot gas path defects in an exhaust jet

    Adamczuk, Rafael R. | Online Contents | 2014


    Exhaust Manifold Radiated Noise Prediction Methodology

    Emery, Jim / Felice, Mario / Zhou, Ming et al. | SAE Technical Papers | 2001


    Exhaust Manifold Thermo-Structural Simulation Methodology

    Rosso, Carlo / Delprete, Cristiana | SAE Technical Papers | 2005


    Exhaust manifold thermo-structural simulation methodology

    Delprete,C. / Rosso,C. / Politecnico di Torino,Dip.di Meccanica,IT | Kraftfahrwesen | 2005


    EXHAUST AIR PATH STRUCTURE OF POWER CONVERTER

    YAMANAKA NORIYUKI | Europäisches Patentamt | 2024

    Freier Zugriff