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Influence of Inlet Flow Modifications on Turbocharger Compressor Performance and Acoustics

Figurella, Neil Anthony
http://rave.ohiolink.edu/etdc/view?acc_num=osu1397720700

Abstract Details

2014, Master of Science, Ohio State University, Mechanical Engineering.
The present study experimentally investigates the influence of inlet flow modifications on the performance and acoustics of a turbocharger compressor. Experiments were performed on a steady flow turbocharger test stand using a single turbocharger and nine different compressor inlet configurations. Each of the configurations varied the flow field entering the compressor by using components such as bends, stationary inlet guide vanes (IGVs), a swirl generating jet, a compressor housing modification, or combinations of these components. For each configuration, the compressor was mapped from choke (maximum flow boundary) to deep surge (minimum flow boundary) along constant speed lines of 60, 86, 114, 136, and 155 krpm, with pressure ratios ranging from unity to about 2.3. Measurements including time averaged compressor performance characteristics, compressor isentropic efficiency, and acoustic data from a compressor inlet duct transducer and an external microphone in the form of spectrograms and acoustic maps of SPL within various frequency bands were examined for each configuration and compared to one another to assess their relevant impact. Compressor measurements for a baseline configuration revealed broadband noise predominantly in the 4-11 kHz range at low to mid flow rates and mild surge in the 15-35 Hz range on the positively sloped portion of the compressor characteristics at low flow rates near the deep surge boundary and for a locally positively sloped region in the mid flow range at 155 krpm. In general, broadband noise along with flow separation was observed as the compressor mass flow rate was reduced and the incidence angle of the flow relative to leading edge of the inducer blade increased. The compressor surge boundary showed moderate improvements over the baseline for the swirl jet configuration at all speeds and the high swirl IGVs and sharp 90 degree bend at 155 krpm only. Relative to the baseline, a reduction in maximum flow rate and compressor pressure ratio at high flow rates was observed for all configurations due to flow losses, which were most significant for the high swirl IGVs. The dominant region of broadband noise occurring at low to mid compressor flow rates in the 4-11 kHz range was reduced relative to the baseline for the high swirl IGV and swirl jet configurations. Mild surge in the 15-35 Hz range observed at mid flow rates for 155 krpm was also reduced relative to the baseline for all configurations, with the most significant improvements observed for the swirl jet and inlet step configurations, due to local slope changes in the characteristics which improve compressor stability. When combinations of components were installed, interactions between components were not observed and the effects of the combined configurations appeared to be simple compounding of those of each individual component present. Overall, the swirl jet and high swirl IGV configurations were found to be the most effective in terms of reducing broadband noise and improving stability at low to mid compressor flow rates, which correspond to low speed and high load engine operating conditions often experienced in vehicle applications.
Ahmet Selamet (Advisor)
Shaurya Prakash (Committee Member)
172 p.
Acoustics; Automotive Engineering; Engineering; Experiments; Fluid Dynamics; Mechanical Engineering
turbocharger; compressor; acoustics; surge

Recommended Citations

Citations

  • Figurella, N. A. (2014). Influence of Inlet Flow Modifications on Turbocharger Compressor Performance and Acoustics [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397720700

    APA Style (7th edition)

  • Figurella, Neil. Influence of Inlet Flow Modifications on Turbocharger Compressor Performance and Acoustics. 2014. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1397720700.

    MLA Style (8th edition)

  • Figurella, Neil. "Influence of Inlet Flow Modifications on Turbocharger Compressor Performance and Acoustics." Master's thesis, Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397720700

    Chicago Manual of Style (17th edition)

osu1397720700
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This open access ETD is published by The Ohio State University and OhioLINK.