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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Influence of cavity flow on turbine aerodynamics / Influence des écoulements de cavité inter-disque sur l'aérodynamique d'une turbine

Fiore, Maxime 07 May 2019 (has links)
Afin de faire face aux fortes températures rencontrées par les composantsen aval de la chambre de combustion, des prélèvements d’air plus frais sont réalisésau niveau du compresseur. Cet air alimente les cavités en pied de turbine et refroidiles disques rotor permettant d’assurer le bon fonctionnement de la turbine.Ce manuscrit présente une étude numérique de l’effet de ces écoulements de cavitéau pied de la turbine sur ses performances aérodynamiques. Les phénomènesd’interaction entre l’air de cavité en pied de turbine et l’air de veine principal est unphénomène encore difficilement compris. L’étude de ces phénomènes est réalisée autravers de différentes approches numériques (RANS, LES et LES-LBM) appliquéesà deux configurations pour lesquelles des résultats expérimentaux s ont disponibles.Une première configuration en grille d’aube linéaire en amont de laquelle différentesgéométries d’entrefer (interface entre plateforme rotor et stator) et débits de cavitépouvaient être variés. Une seconde configuration annulaire composée de deux étagesde turbine comprenant les cavités en pied et plus proche d’une configuration industrielle.Les pertes additionnelles associées à l’écoulement de cavité sont mesurées etétudiées à l’aide d’une méthode basée sur l’exergie (bilans d’énergie dans l’objectifde générer du travail). / In order to deal with high temperatures faced by the components downstreamof the combustion chamber, some relatively cold air is bled at the compressor.This air feeds the cavities under the turbine main annulus and cool down the rotordisks ensuring a proper and safe operation of the turbine. This thesis manuscriptintroduces a numerical study of the effect of the cavity flow close to the turbine hubon its aerodynamic performance. The interaction phenomena between the cav-ity andmain annulus flow are not currently fully understood. The study of these phenomenais performed based on different numerical approaches (RANS, LES and LES-LBM)applied to two configurations for which experimental results are avail-able. A linearcascade configuration with an upstream cavity and various rim seal geometries(interface between rotor and stator platform) and cavity flow rate avail-able. Arotating configuration that is a two stage turbine including cavities close to realisticindustrial configurations. Additional losses incurred by the cavity flow are measuredand studied using a method based on exergy (energy balance in the purpose togenerate work).
2

Didaktická analýza učiva o účetní uzávěrce a závěrce ve druhém koncentrickém okruhu předmětu Účetnictví na OA / Didactic analysis of curriculum of final accounts and financial statements in the second concentric circle of the subject of accounting on the Business Academy

Soukupová, Monika January 2013 (has links)
The thesis deals with didactic analysis of curriculum of final accounts and financial statements in the second concentric circle. The aim of the thesis is to propose didactic analysis, which corresponds with professional knowledge of Business Academy students. The theoretical part is dedicated especially to incorporate the curriculum into the subject of accounting didactic methods and didactic techniques and also the issue of IAS/IFRS. The next part is focused on didactic analysis. There is a process of interpretation suggested in the individual chapters which includes clear schemes, tables, own examples and also didactic elaboration of IAS/IFRS. It is designed in the way to be most understandable for Business Academy students. The conclusion includes a survey results. This part shows how the teachers of the Business Academies teach this certain issue. The result is verification if the didactic analysis corresponds with the teaching in practice.

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