A Novel Vortex Identification Technique Applied to the 3D Flow Field of a High-Pressure Turbine

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F19%3A00340422" target="_blank" >RIV/68407700:21220/19:00340422 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1115/GT2019-90462" target="_blank" >https://doi.org/10.1115/GT2019-90462</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1115/GT2019-90462" target="_blank" >10.1115/GT2019-90462</a>

Result language

angličtina

Original language name

A Novel Vortex Identification Technique Applied to the 3D Flow Field of a High-Pressure Turbine

Original language description

The efficiency of modern axial turbomachinery is strongly driven by the secondary flows within the vane or blade passages. The secondary flows are characterized by a complex pattern of vortical structures that origin, interact and dissipate along the turbine gas path. The endwall flows are responsible for the generation of a significant part of the overall turbine loss because of the dissipation of secondary kinetic energy and mixing-out of non-uniform momentum flows. The understanding and analysis of secondary flows requires a reliable vortex identification technique to predict and analyse the impact of specific turbine designs on the turbine performance. However, literature shows a remarkable lack of general methods to detect vortices and to determine the location of their cores and to quantify their strength. This paper presents a novel technique for the identification of vortical structures in a general 3D flow field, based on a triple decomposition of motion proposed by Kolář. The present method allows to locate automatically the core of each vortex, quantify its strength and determine the vortex bounding surface. The output may be used to visualize the turbine vortical structures for the purpose of interpreting the complex three-dimensional viscous flow field, as well as to highlight any case-to-case variations by quantifying the vortex strength and location. The vortex identification method is applied to a high-pressure turbine with three optimized blade tip geometries. The 3D flowfield is obtained by CFD computations performed with Numeca FINE/Open. The computational model uses steady-state RANS equations closed by the Spalart-Allmaras turbulence model. Although developed for turbomachinery applications, the vortex identification method proposed in this work is of general applicability to any three-dimensional flow-field.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

20304 - Aerospace engineering

Project

<a href="/en/project/EF16_019%2F0000826" target="_blank" >EF16_019/0000826: Center of Advanced Aerospace Technology</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Proceedings of ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition

ISBN

978-0-7918-5856-1

ISSN

—

e-ISSN

—

Number of pages

18

Pages from-to

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Publisher name

American Society of Mechanical Engineers - ASME

Place of publication

New York

Event location

Phoenix, Arizona

Event date

Jun 17, 2019

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000501628000009