Assessment of Heat Transfer Effects on the Performance of a Radial Turbine using Large Eddy Simulation
2010 (English)In: 9th International Conference on Turbochargers and Turbocharging - Institution of Mechanical Engineers, Combustion Engines and Fuels Group, 2010, 281-291 p.Conference paper (Refereed)
One way to reduce fuel consumption and emissions is to downsize the engine in combination with turbo-charging. The turbine works under highly unsteady flow conditions, since the exhaust flow is pulsatile, turbulent and with a varying strength of the axial and secondary flow components. The heat transfer from the fluid to the turbine housing will be different for a pulsatile flow compared to a non-pulsatile flow. Therefore, the effects of heat transfer at the walls on the turbine performance working under pulsatile flow conditions are assessed and quantified by performing a numerical study with Large Eddy Simulation. Two cases are considered, one case with adiabatic walls and one case with heat transfer at the walls. The results show that the difference in the obtained shaft power is small. Even the differences in the time mean efficiency is small, it only differs with 2 percent units, even though the heat transferred to surroundings is as large as approximately 60 percent of the delivered shaft power.
Place, publisher, year, edition, pages
2010. 281-291 p.
Adiabatic wall, Exhaust flow, Flow condition, Heat transfer effects, Numerical studies, Radial turbines, Shaft power, Turbine housings, Turbine performance
IdentifiersURN: urn:nbn:se:kth:diva-12739DOI: 10.1243/17547164C0012010022ScopusID: 2-s2.0-79959600664ISBN: 978-190759915-6OAI: oai:DiVA.org:kth-12739DiVA: diva2:318478
9th International Conference on Turbochargers and Turbocharging; Westminster, London; United Kingdom; 19 May 2010 through 20 May 2010