Low thermal inertia exhaust module
Koivisto, Kalle (2019)
2019
Konetekniikka
Tekniikan ja luonnontieteiden tiedekunta - Faculty of Engineering and Natural Sciences
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Hyväksymispäivämäärä
2019-06-04
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tty-201906111876
https://urn.fi/URN:NBN:fi:tty-201906111876
Tiivistelmä
On its way to a turbocharger, exhaust gas loses a great deal of its thermal energy to the cold exhaust manifold walls. The main purpose of this master’s thesis is to improve the transient performance of the engine by reducing the thermal inertia of the exhaust module. The reduction of assembly time and external insulation needed have a secondary priority.
The exhaust module must tolerate harsh conditions while guiding exhaust gas. It must handle high temperatures of up to 600 °C, temperature changes, considerable vibrations and pressures up to 12 bar of absolute pressure.
The current solution has too high thermal inertia which causes delay for turbocharger to reach its full operation speed. This impacts on how fast the engine load can be increased.
How could thermal inertia and heat transfer from the exhaust pipe module be decreased, while maintaining the exhaust pipe key functionality? How could the thermal equilibrium be reach as fast as possible after starting the engine?
This research is based on a literature review. The used research methods are: ARC-diagram, DACM-tool and TRIZ. Potential solution found in through these were dual walled structure and varying geometry.
The exhaust module must tolerate harsh conditions while guiding exhaust gas. It must handle high temperatures of up to 600 °C, temperature changes, considerable vibrations and pressures up to 12 bar of absolute pressure.
The current solution has too high thermal inertia which causes delay for turbocharger to reach its full operation speed. This impacts on how fast the engine load can be increased.
How could thermal inertia and heat transfer from the exhaust pipe module be decreased, while maintaining the exhaust pipe key functionality? How could the thermal equilibrium be reach as fast as possible after starting the engine?
This research is based on a literature review. The used research methods are: ARC-diagram, DACM-tool and TRIZ. Potential solution found in through these were dual walled structure and varying geometry.