SIMPLE ALGORITHM FOR THE DESIGN OF CENTRIPETAL TURBINE INLET SCROLLS

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F23%3A00373990" target="_blank" >RIV/68407700:21220/23:00373990 - isvavai.cz</a>

Result on the web

<a href="https://koka2023.online/" target="_blank" >https://koka2023.online/</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

SIMPLE ALGORITHM FOR THE DESIGN OF CENTRIPETAL TURBINE INLET SCROLLS

Original language description

Description of simple algorithm, based on free vortex flow assumption, suitable for the design of different shapes for a centripetal turbine inlet scrolls (e.g., a twin scroll or sector divided scroll), is presented. The cross-section shape is combined from rhomboid and asymmetric trapezoid with radii and width dependent on tangential angle variable. The changes of radii and widths are interpolated linearly from rectangular inlet flange including the interface radius between both geometrical shapes. The inner radius of radially closed runner scroll part may be iteratively fitted to another scroll if sector dividion is used. The outer radius keeps constant tangential velocity in a runner part, followed by constant specific angular momentum in a scroll part, opened to a turbine nozzle ring of vaneless or bladed design. The open scroll part is designed for uniform tangential and radial velocity components along the tangential angle coordinate. The changes of density due to large subsonic velocity changes are respected by newly developed numerical procedure, converging well up to Mach number close to one. If necessary, approximate pressure loss correction can be applied to angular momentum conservation. The output of the developed program is suitable for final design elaboration in 3D CAD systems with more realistic shapes by filleted or rounded edges, which are then subjected to 3D modelling of pressure and velocity fields. The results were successfully transferred to co-simulation in GT Suite/AVL Fire 1D/3D simulation systems, developed at CTU and tested for comparison with standard designs of scrolls considering losses. The level of scroll flow field uniformity and thus turbine efficiency is highly satisfactory. Moreover, the rules for adjusting discharge coefficient of a scroll to required turbine flow capacity were found. The system creates a part of semi-automatic DASY 3D CAD procedure.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20302 - Applied mechanics

Project

<a href="/en/project/TN02000054" target="_blank" >TN02000054: Božek Vehicle Engineering National Center of Competence</a><br>

Continuities

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

Publication year

2023

Confidentiality

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

Article name in the collection

KOKA 2023 SCIENTIFIC PROCEEDINGS

ISBN

978-80-214-6164-2

ISSN

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e-ISSN

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Number of pages

10

Pages from-to

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Publisher name

Brno University of Technology, Faculty of Mechanical Engineering

Place of publication

Brno

Event location

Hustopeče

Event date

Sep 6, 2023

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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