Abstract
Numerical methods were carried out on a turbocharger compressor with inlet bent pipe to research a novel clocking effect between the inlet bend and the volute. It was found that the clocking effect with 3.4 percent of variations (1.9 percentage points) in compressor efficiency positively exists at the research point near chock. The reason for the changed efficiency loss is that the inlet bend induces a serious distortion of approaching flow to impeller inlet on one hand, and the downstream volute causes a circumferentially non-uniform distribution of pressure in vaneless diffuser. By adjusting the clocking positions between inlet bend and volute, not only is the unsteadiness of the flow rate through single impeller channel changed, but the uniformity of the incoming flow at the vaneless diffuser inlet is modulated as well. It is the dominant reason for the novel clocking effect that the bad uniformity causes more flow loss in both diffuser and volute.
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Recommended by Associate Editor Tong Seop Kim
Ben Zhao received Ph.D. degree in 2015 at power machine and engineering from Beijing Institute of Technology. He was a Ph.D. candidate when studying the clocking effect in a turbocharger compressor with inlet bent pipes.
Ce Yang is a professor and Ph.D. supervisor at School of Mechanical Engineering, Beijing Institute of Technology, Beijing, China. He received the Ph.D. degree from the Tsinghua University in 1998. His current research interests are the complex flow in turbomachinery.
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Zhao, B., Yang, C., Hu, L. et al. A novel clocking effect between inlet bend and volute in an automotive turbocharging system. J Mech Sci Technol 30, 2335–2342 (2016). https://doi.org/10.1007/s12206-016-0443-8
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DOI: https://doi.org/10.1007/s12206-016-0443-8