The centrifugal compressor of marine engine turbocharger is composed of impeller, 1st vaneless diffuser, vaned diffuser, 2nd vaneless diffuser and volute casing. An examination of the condition of the flow leaving the impeller exit kinetic energy often accounts for 30–50% of the shaft work input to the compressor stage, and for energy efficiency it is important to recover as much of this as possible. This is the function of the diffuser which follows the impeller. Effective pressure recovery downstream of an impeller is very important to realize a centrifugal compressor with high efficiency and high pressure ratio, and an appropriate selection of a diffuser for a specific impeller is a critical step to develop the compressor accordingly. The purpose of this study is to investigate the sensitivity of how compressor performances changes as vaned diffuser geometry is varied. Three kinds of vaned diffusers were studied and its results were compared. First vaned diffuser type is based on NACA airfoil and second is channel diffuser and third is conformal transformation of NACA 65 airfoil. Mean-line prediction method was applied to investigate the performance and stability for three kinds of diffusers. And CFD analyses have been done for comparison and detailed interior flow pattern study. In this study, the off design behavior of three different type of diffuser, given by mean-line prediction, was investigated using CFD results and selected best diffuser geometry which satisfy wider operating range and higher pressure recovery than the others. The numerical results were compared with experimental data for validation.
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ASME 2006 Internal Combustion Engine Division Fall Technical Conference
November 5–8, 2006
Sacramento, California, USA
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
0-7918-4260-6
PROCEEDINGS PAPER
The Numerical Study on the Performance Evaluations and Flow Structures for the Diffuser of Centrifugal Compressor in a Marine Engine Turbocharger
Hong-Won Kim,
Hong-Won Kim
Hyundai Heavy Industries Company, Ltd., Ulsan, Republic of Korea
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Seung-Hyup Ryu,
Seung-Hyup Ryu
Hyundai Heavy Industries Company, Ltd., Ulsan, Republic of Korea
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Jong-Il Park,
Jong-Il Park
Hyundai Heavy Industries Company, Ltd., Ulsan, Republic of Korea
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Sang-Hak Ghal,
Sang-Hak Ghal
Hyundai Heavy Industries Company, Ltd., Ulsan, Republic of Korea
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Ji-Soo Ha
Ji-Soo Ha
Hyundai Heavy Industries Company, Ltd., Ulsan, Republic of Korea
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Hong-Won Kim
Hyundai Heavy Industries Company, Ltd., Ulsan, Republic of Korea
Seung-Hyup Ryu
Hyundai Heavy Industries Company, Ltd., Ulsan, Republic of Korea
Jong-Il Park
Hyundai Heavy Industries Company, Ltd., Ulsan, Republic of Korea
Sang-Hak Ghal
Hyundai Heavy Industries Company, Ltd., Ulsan, Republic of Korea
Ji-Soo Ha
Hyundai Heavy Industries Company, Ltd., Ulsan, Republic of Korea
Paper No:
ICEF2006-1546, pp. 413-419; 7 pages
Published Online:
September 5, 2008
Citation
Kim, H, Ryu, S, Park, J, Ghal, S, & Ha, J. "The Numerical Study on the Performance Evaluations and Flow Structures for the Diffuser of Centrifugal Compressor in a Marine Engine Turbocharger." Proceedings of the ASME 2006 Internal Combustion Engine Division Fall Technical Conference. ASME 2006 Internal Combustion Engine Division Fall Technical Conference (ICEF2006). Sacramento, California, USA. November 5–8, 2006. pp. 413-419. ASME. https://doi.org/10.1115/ICEF2006-1546
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