Physical 1D Model of a High Pressure Ratio Centrifugal Compressor for Turbochargers

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F17%3A00320886" target="_blank" >RIV/68407700:21220/17:00320886 - isvavai.cz</a>

Výsledek na webu

<a href="https://doaj.org/toc/1804-9338" target="_blank" >https://doaj.org/toc/1804-9338</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Physical 1D Model of a High Pressure Ratio Centrifugal Compressor for Turbochargers

Popis výsledku v původním jazyce

The physical model of a centrifugal compressor aims at finding detailed information on values inside the machine, based on standard compressor map knowledge and basic geometry of a compressor. The model describes aerodynamics of flow from compressor inlet to outlet at a central streamline, if mass flow rate and impeller speed is known. The solution of basic conservation laws can yield unknown, cross-section averaged temperatures, pressures and velocities along central streamline for compressible fluid and treats transonic operation, as well. After the description of general methods for solving compressible fluid flow and transformation of radial blade cascades to axial ones, the system of equations is completed with empiric knowledge of compressor blade cascades – forces and losses. Howell theory is used for axial inducer and after conform transformation to radial blade diffuser cascade, as well. Radial vanes of a rotor are transformed fixing the same length of a blade and flow areas and flow separation at inducer outlet is taken into account. Specific procedure is developed for a vaneless diffuser with friction losses. Non-linear equations of gas dynamics have to be solved in numerical and iterative way with help of Newton-Raphson solver. The model treats transonic flow features in both compressor inducer and diffuser. The validation of the model will be published in the second paper focused to this topics. The model can be used for quasi-steady simulation in a 1D model, especially if compressor map extrapolation is required. The model predictions create virtual sensors for identification of directly unmeasurable quantities inside a compressor. It helps in better understanding in-compressor processes. Moreover, the model offers parameters for unsteady model, based on 1D modules for unsteady flow modelling.

Název v anglickém jazyce

Physical 1D Model of a High Pressure Ratio Centrifugal Compressor for Turbochargers

Popis výsledku anglicky

The physical model of a centrifugal compressor aims at finding detailed information on values inside the machine, based on standard compressor map knowledge and basic geometry of a compressor. The model describes aerodynamics of flow from compressor inlet to outlet at a central streamline, if mass flow rate and impeller speed is known. The solution of basic conservation laws can yield unknown, cross-section averaged temperatures, pressures and velocities along central streamline for compressible fluid and treats transonic operation, as well. After the description of general methods for solving compressible fluid flow and transformation of radial blade cascades to axial ones, the system of equations is completed with empiric knowledge of compressor blade cascades – forces and losses. Howell theory is used for axial inducer and after conform transformation to radial blade diffuser cascade, as well. Radial vanes of a rotor are transformed fixing the same length of a blade and flow areas and flow separation at inducer outlet is taken into account. Specific procedure is developed for a vaneless diffuser with friction losses. Non-linear equations of gas dynamics have to be solved in numerical and iterative way with help of Newton-Raphson solver. The model treats transonic flow features in both compressor inducer and diffuser. The validation of the model will be published in the second paper focused to this topics. The model can be used for quasi-steady simulation in a 1D model, especially if compressor map extrapolation is required. The model predictions create virtual sensors for identification of directly unmeasurable quantities inside a compressor. It helps in better understanding in-compressor processes. Moreover, the model offers parameters for unsteady model, based on 1D modules for unsteady flow modelling.

Druh

J_ost - Ostatní články v recenzovaných periodicích

CEP obor

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OECD FORD obor

20303 - Thermodynamics

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

MECCA Journal of Middle European Construction and Design of Cars

ISSN

1214-0821

e-ISSN

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Svazek periodika

XV

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

20

Strana od-do

1-20

Kód UT WoS článku

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EID výsledku v databázi Scopus

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