INSIGHTS INTO TURBOCHARGER CENTRIFUGAL COMPRESSOR STABILITY USING HIGH-FIDELITY CFD AND A NOVEL IMPELLER DIFFUSION FACTOR
Citation:
Yiming Liu, Stephen Spence, John Horsley, Stuart Mann, Charles Stuart, INSIGHTS INTO TURBOCHARGER CENTRIFUGAL COMPRESSOR STABILITY USING HIGH-FIDELITY CFD AND A NOVEL IMPELLER DIFFUSION FACTOR, ASME Turbo Expo 2024, London, UK, June 24-28 2024, 2024Download Item:
Abstract:
Turbocharger technologies are widely applied in the modern
automotive industry to meet increasingly stringent carbon
emission standards. To support the continuous enhancement of
these tactics, delivering improvement to the performance and
stability of turbocharger compressors at low mass flow rate
regimes is of paramount importance.
The present paper investigated the stability of a
turbocharger compressor stage equipped with a ported shroud,
using high-fidelity CFD simulations. It was found that the
recirculated flow passing through the ported shroud device had
primary influence on the flow condition in the vicinity of the
impeller tip region (80% to 100% span). This discovery
facilitated the definition of a modified impeller diffusion factor
(DF), which was applied to the CFD results for three different
compressor geometry configurations to lead to the provision of
quantitative metrics for impeller stability. Furthermore, the
observed change in the limiting impeller DF along the
compressor surge line indicated that the dominant components
governing the instability of the entire stage had switched, i.e., the
stalling behavior of the compressor stage had transitioned from
impeller dominated stall to vaneless diffuser dominated stall.
Additionally, the limiting impeller DF clearly showed that one of
the compressor configurations with a change in the hub endwall
recess around the rear of the impeller improved the impeller
stability by 3%. By comparison, another configuration with a
change to strut geometry in the ported shroud recirculation
channel reduced the impeller stability by 10%.
The present work addressed the gap in the understanding
about the stability of different compressor configurations
equipped with a ported shroud, and was useful for determining
the changes in compressor global and local instability through a
quantitative parameter based on a modified definition of DF
Author's Homepage:
http://people.tcd.ie/stuartchhttp://people.tcd.ie/spences
Description:
PUBLISHEDLondon, UK
Author: Spence, Stephen
Other Titles:
ASME Turbo Expo 2024Advisor:
Stuart, CharlesType of material:
Conference PaperAvailability:
Full text availableSubject (TCD):
Smart & Sustainable PlanetSource URI:
https://hdl.handle.net/2262/108686Metadata
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