PHYSICAL MODEL OF A RADIAL TURBINE WITH UNSTEADY FLOW USED FOR OPTIMIZATION OF TURBINE MATCHING

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F17%3A00320358" target="_blank" >RIV/68407700:21220/17:00320358 - isvavai.cz</a>

Result on the web

<a href="https://lccn.loc.gov/2017028105" target="_blank" >https://lccn.loc.gov/2017028105</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

PHYSICAL MODEL OF A RADIAL TURBINE WITH UNSTEADY FLOW USED FOR OPTIMIZATION OF TURBINE MATCHING

Original language description

Advantages of physical models of different complexity compared to map-based model employed in engine thermodynamics simulation codes. No need for dimensionless coefficients, only power and mass flow rate are relevant. Principles of physical modelling of radial turbines based on a central streamline model for single- and twin-scroll layout with controlable blades - variable geometry turbines - or vaneless nozzle ring. Basic conservation equations, description of turbine geometry, aerodynamic and friction losses and use of commercial solvers for finding numerical results. Central streamline model using quasi-steady approach or fully one-dimensional unsteady description of in-turbine processes including flow in a scroll, a nozzle ring, vaneless nozzle ring, mixing zone upstream an impeller, an impeller itself and outlet diffuser. Sonic limits. Definitions of averaged angles of flow and loss coefficients (partial isentropic efficiencies), Reynolds number influence. Predictive ability of physical model by using experimentally or in CFD found loss coefficients. Basic issues of turbine map measurements in single- or twin-scroll arrangement using a compressor for turbine loading. Model-based experiments, measurement evaluation and model calibration using optimization methods. Specific features of turbine operation with pulse exhaust manifold at an engine and measurement of unsteady operation under pressure/temperature pulses at fluctuating turbine shaft speed. Application of the model: Methods for turbine – engine – compressor matching using the physical model. Extrapolation of experience from similar systems before detailed CFD simulation or experiments are done. Transferring turbine features found during mapping back to the design stage at a turbocharger manufacturer.

Czech name

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Czech description

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Type

C - Chapter in a specialist book

CEP classification

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OECD FORD branch

20303 - Thermodynamics

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2017

Confidentiality

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

Book/collection name

Turbochargers and turbocharging: Advancements, applications and research

ISBN

978-1-5361-2239-8

Number of pages of the result

84

Pages from-to

271-354

Number of pages of the book

538

Publisher name

Nova Science Publisher, Inc.

Place of publication

Hauppauge NY

UT code for WoS chapter

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