A 1-D Unsteady Model of a Twin Scroll Radial Centripetal Turbine for Turbocharging Optimization

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F18%3A00320412" target="_blank" >RIV/68407700:21220/18:00320412 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

A 1-D Unsteady Model of a Twin Scroll Radial Centripetal Turbine for Turbocharging Optimization

Original language description

The thesis describes the development of methodology, which utilizes the map-less approach in simulation of a radial centripetal turbine with twin scroll. The steady flow turbine maps are not utilized during the entire process. The twin scroll turbine, which operates under unsteady conditions on engine, achieves different level of the impeller admission. For validation and calibration of the turbine performance under arbitrary level of the impeller admission, a specific turbocharger test bed with separated sections upstream of a turbine was developed. The test bed enables to achieve arbitrary level of the impeller admission via throttling in sections or closure of one section. A selected twin entry turbine was measured under steady flow conditions on the mentioned test bed with open loop. The required number of turbine working points in case of map-less approach is relatively low in comparison with the classical steady flow maps, which are generated for each level of the impeller admission. The turbine was measured at full, partial and extreme partial admission with closed section. The model of the whole turbine with scrolls, mixing of flows at nozzle ring upstream of the impeller, turbine wheel, leakages and outlet pipe has to be calibrated under steady flow in compliance with the data measured on the turbocharger test bed. A turbocharged six cylinder diesel engine equipped with the twin scroll turbine was properly measured at steady states and transients. The goal of the measurement was to obtain data for verification of the turbine model behaviour under highly pulsating flow conditions. The comprehensive methodology utilizing the map-less approach was validated and verified by the engine simulation with full 1-D turbine model under real conditions, measured on the turbocharged internal combustion engine. The results were also compared with the classical map based approach.

Czech name

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Czech description

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Type

O - Miscellaneous

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

2018

Confidentiality

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