A DFT Spectrum Acoustic Analysis for Investigating Pulse Duration Effect on Performance, Psychoacoustic Sound Level of Turbocharger Turbines Through C +  + FDM Code

Ketata, Ahmed; Ketata, I.; Driss, Zied

doi:10.1007/s13369-021-06459-w

Cited by 2 publications

(1 citation statement)

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“…Only fundamental components of the profiles were considered. The fundamental component of each component was obtained through an FFT spectral analysis using the same decomposition method of Ketata et al 9,40 Figures 17 and 18 show the superposition of the instantaneous output power profile to the static pressure one for the different working fluids and under the investigated flow pulse frequencies. Figure 19(a) illustrates an example of this time lag at a flow pulse frequency of 100 Hz for the ALGW case.…”

Section: Flow Mixture Effect On Turbo Lagmentioning

confidence: 99%

Analysis of performance and time lag of turbocharger turbines fed with gasoline and diesel burnt gases and air under pulsating flow conditions

Ketata

Driss

2022

International Journal of Engine Research

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The turbine, an enabling component of turbochargers, is a seat of highly complex unsteady flow as well as varying gas compositions between diesel and gasoline engines. Thus, it is necessary to take into account different physical models when simulating such turbines. Researchers have often considered the turbine working gas as air, which may not lead to an accurate prediction of actual turbine characteristics. In the present work, the effect of the working gas on the performance of turbocharger turbines as well as on the turbo lag was investigated through a set of numerical simulations for six wastegate opening degrees from 0% up to 100% and under a wide range of the flow pulse frequency ranging from 33.33 up to 166.66 Hz. Four working fluids were involved in this study which are the gasoline burnt gas, diesel burnt gas, air with like gasoline engine waves, and air with like diesel engine waves. The performance of the turbine and its responsiveness quantified as the time lag with burnt gases from both diesel and gasoline engines were compared to those with air. Results showed totally deviated unsteady performance characteristics compared to the turbine working with air. Results also confirmed that considering the working fluid as air may not lead to a fair representation of the actual turbine performance characteristics. The findings of this work put emphasis on the importance of the gas composition when modeling such turbines by engineers especially during the design process where a good turbocharger-engine match has to be met.

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Section: Flow Mixture Effect On Turbo Lagmentioning

confidence: 99%