Acoustical Methods for Investigating Turbocharger Flow Instabilities

Kabral, Raimo; Rämmal, Hans; Åbom, Mats

doi:10.4271/2013-01-1879

Cited by 10 publications

(5 citation statements)

References 10 publications

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“…It should be noted however that while these decomposition techniques are most robust than simple SPL readings, for a completely rig-independant result full two-port characterization should be performed in a rig equipped with active exciters [44]. Also, these methods assume plane wave propagation, so if higher frequencies are required special weighting factors should be used to estimate sound intensity [45].…”

Section: Noisementioning

confidence: 99%

Local flow measurements in a turbocharger compressor inlet

Torregrosa

Broatch

Margot

et al. 2017

Experimental Thermal and Fluid Science

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This paper describes an experimental study carried out with the objective of characterizing flow instabilities in turbocharger compressors, specially the distribution of the high-temperature compressed backflow that appears upstream of the impeller at marginal surge conditions. The inlet of a test compressor was fitted with linear and circumferential thermocouple arrays in order to measure the temperature distribution caused by this backflow, whose independence of duct wall temperature was validated through thermographic imaging. Miniaturized pressure probes at the inducer and diffuser showed how pressure spectra varied during the different operating conditions. Induct acoustic intensity was measured in both the inlet and the outlet to investigate the correlation between a known super-synchronous broadband issue known as whoosh noise and the backflow behaviour as characterized by local pressure and temperature. Analysis of the results points to inlet whoosh noise being boosted by this reversed flow but not caused by it, the source probably being located at or downstream of the compressor impeller.

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Section: Noisementioning

confidence: 99%

Local flow measurements in a turbocharger compressor inlet

Torregrosa

Broatch

Margot

et al. 2017

Experimental Thermal and Fluid Science

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“…This is an extension of previous works (Rämmal and Åbom 2009, Tiikoja et al 2011, Kabral et al 2013) concerning accurate measurements of turbo-charger acoustics, which only have covered two-ports (one inlet/outlet) configurations. By presenting and discussing the measurement methodology and test-rig design in detail it is shown how high quality data can be experimentally obtained under controlled laboratory conditions.…”

Section: Discussionmentioning

confidence: 85%

“…the source data independent of the coupled duct system, can further be experimentally determined as the passive data test procedure also characterizes the test-rig response. The reflection-free source data can be extracted from total measured in-duct sound field by direct extension of the complete twoport theory presented in previous works (Holmberg 2011, Kabral 2013.…”

Section: Discussionmentioning

confidence: 99%

“…In the present work, the unique test facility for acoustic testing of turbochargers at the KTH CCGEx laboratory, also used in the previous works on turbocharger acoustics (Rämmal and Åbom 2009, Tiikoja et al 2011, Kabral et al 2013, is further developed to enable the experimental investigation of twin-scroll turbines. The new test-rig is then used to experimentally determine acoustic performance data for an automotive twin-scroll turbine under controlled laboratory conditions.…”

Section: Introductionmentioning

confidence: 99%

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Experimental acoustic characterization of automotive twin-scroll turbine

Kabral

Nemr

Ludwig

et al. 2017

European Conference on Turbomachinery Fluid Dynamics and Hermodynamics

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The present paper focuses on the experimental determination of automotive twin-scroll turbine acoustic performance. The unique test-rig for automotive turbocharger acoustics at KTH CCGEx laboratory is further developed to enable testing of modern twin-scroll turbines under controlled laboratory conditions. It is shown how the passive acoustic properties of such turbines can be accurately characterized by means of an acoustic three-port formulation. Governing equations along with the new test-rig design are presented and discussed in detail. Furthermore, complementary results from the first experimental determination of twin-scroll turbine acoustic three-port data are presented.

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“…Starting from the work of Trochon [29] and Evans and Ward [30,31] up to more recent investigations such as those of Åbom, Kabral and Rammal [32,33] at the Swedish Royal Institute of Technology (KTH), several different methodologies for characterising the acoustical emission of automotive turbochargers can be found.…”

Section: Methods For Turbocharger Noise Characterizationmentioning

confidence: 99%

Experiments on turbocharger compressor acoustics

Tíscar¹

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Hundreds of noises wove themselves into a wiry texture of sound with barbs protruding here and there, smart edges running along it and subsiding again, with clear notes splintering off and dissipating. By this noise alone, whose special quality cannot be captured in words, a man returning after years of absence would have been able to tell with his eyes shut that he was back in the Imperial Capital and Royal City of Vienna.

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Acoustical Methods for Investigating Turbocharger Flow Instabilities

Cited by 10 publications

References 10 publications

Local flow measurements in a turbocharger compressor inlet

Local flow measurements in a turbocharger compressor inlet

Experimental acoustic characterization of automotive twin-scroll turbine

Experiments on turbocharger compressor acoustics

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