Development of a radial inflow turbine for sub-zero applications on an automotive dynamometer

Lorenz Hammerschmidt

Development of a radial inflow turbine for sub-zero applications on an automotive dynamometer

Titel in Übersetzung: Entwicklung einer Radialturbine für Kaltluftprozesse an einem Rollprüfstand

Lorenz Hammerschmidt

Lehrstuhl für Thermoprozesstechnik (580)

Publikation: Thesis / Studienabschlussarbeiten und Habilitationsschriften › Masterarbeit

Abstract

Durch aktuelle Änderungen in der Gesetzgebung getrieben, erhöhen sich die Anforderungen an PKW Motoren hinsichtlich der Reduktion von Schadstoffemissionen. Es werden vereinheitlichte Zyklen am Prüfstand wie dem Worldwide Harmonised Light Vehicle Test Procedure (WLTP) und Tests im realen Fahrbetrieb (RDE) durchgeführt.[1]–[3] Aufgrund hoher Kosten für RDEs, wird versucht einen großen Teil der Emissionstests auf Rollprüfständen abzuwickeln. Die europäische Durchschnittstemperatur liegt bei 14°C, wobei der WLTP bei 23°C durchgeführt wird.[4] Für eine bessere Repräsentation der Testergebnisse, müssten Prüfstände WLTPs bei Niedertemperaturen durchführen können. Bedingt durch die Standards sind die meisten Prüfstände nicht ausgerüstet Kaltluft für den Prozess bereitzustellen. Eine Umrüstung und Installation von herkömmlichen Kühlsystemen ist entweder sehr kostspielig oder ineffizient, daher soll ein innovatives System entwickelt werden, bei dem vorgekühlte und vorkomprimierte Luft an einer Radialturbine entspannt wird. Durch die Entspannung können Temperaturen unter dem Gefrierpunkt erreicht werden. In dieser Arbeit wird ein mathematisches Modell vorgestellt, welches ein Primärdesign der Radialturbine berechnet.[5] Basierend auf der Berechnung wird der Stator, der Rotor und das Gehäuse konstruiert und mittels CFD Simulation in Ansys Fluent getestet. Es werden drei Ausprägungen präsentiert, wobei zwei Fälle eine Modifikation zur Verbesserung bereits enthalten.

Titel in Übersetzung	Entwicklung einer Radialturbine für Kaltluftprozesse an einem Rollprüfstand
Originalsprache	Englisch
Qualifikation	Dipl.-Ing.
Gradverleihende Hochschule	Montanuniversität
Betreuer/-in / Berater/-in	Spijker, Christoph, Mitbetreuer (intern) Raupenstrauch, Harald, Betreuer (intern)
Datum der Bewilligung	23 Okt. 2020
Publikationsstatus	Veröffentlicht - 2020

Bibliographische Notiz

gesperrt bis 08-09-2025

Schlagwörter

Radial Turbine
Turbomaschine
Kälteprozess
WLTP
Mathematica
Ansys Fluent
CFD
Turbinen Design
Automobilindustrie
mean line model
Strömungslehre
Thermodynamik

Gesperrte Studienabschlussarbeit

Volltext
Endgültige, publizierte Fassung, 5,79 MB
Sperrfrist läuft ab am: 8/09/25

Dieses zitieren

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abstract = "Driven by recent legislative changes, the requirements for passenger car engines in terms of reduced pollutant emissions have increased. Standardised cycles are carried out, such as the Worldwide Harmonised Light Vehicle Test Procedure (WLTP) on the dynamometer and real-life driving (RDE) tests. [1]–[3] Due to high costs for RDEs, an attempt is made to handle a large part of the emission tests on rolling test benches. The European average temperature is 14°C, with the WLTP at 23°C. [4] For better representation of test results, test rigs would have to be able to perform WLTPs at low temperatures. Due to the standards, most test benches are not equipped to provide cold air for the process. Retrofitting and installing conventional cooling systems are sprawling, costly and inefficient, so an innovative system is to be developed that expands pre-cooled and pre-compressed air on a radial turbine. Expanding can reach temperatures below freezing. In this work, a mathematical model adapted and modified from Aungier is provided for the predesign of the turbine. [5] Based on the results of the mean line model, the rotor, stator and volute of the turbomachinery had been modelled and tested in a CFD simulation using Ansys Fluent. Furthermore, methods are introduced to evaluate the design during the design procedure. Three test cases are provided to compare the results from the original case obtained with the mathematical model and two modifications.",

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