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Development of a new system for measuring the swirl ratio of an engine cylinder head under an unsteady flow condition

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Abstract

A new impulse-type swirl meter that measures the swirl ratio (Rs) and flow coefficient (Cfmean) during an intake air process for the intake port of an engine cylinder head under unsteady flow conditions was developed. The camshaft of the cylinder head was directly rotated by a step motor, allowing the valve lift to be adjusted automatically with the camshaft profile in the newly developed swirl measurement system. The measurements of the swirl ratio and flow coefficient were automated using a FPGA-DAQ board and a computer. The rotational speeds of the camshaft were held constant at steps of 90, 120, 150, 180 and 210 rpm during the measurement. As the camshaft rotation speed increased, the values of Rs tended to decrease while those of Cfmean tended to increase, implying that Rs and Cfmean depend on the engine speed. These results should be considered in the design of an intake port. With the newly developed swirl measurement system, it is possible to measure Rs and Cfmean repeatedly in a very short time. The repetitive measurement results of Rs and Cfmean were statistically processed. Through an uncertainty analysis, the values of the upper and lower bounds of Rs and Cfmean can be calculated for each camshaft rotation speed.

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Authors and Affiliations

  1. Seoul Center 2nd Team, Defense Agency for Technology and Quality, Seoul, Korea

    Dae San Oh

  2. Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology, Seoul, 01811, Korea

    Choong Hoon Lee

Authors
  1. Dae San Oh
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  2. Choong Hoon Lee
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Corresponding author

Correspondence to Choong Hoon Lee.

Additional information

Recommended by Associate Editor Jeong Park

Oh, Dae-San received his B.S. (2010) in Department of Automotive Engineering at Seoul National University of Science and Technology. He also received M.S. (2012) in mechanical engineering from Yonsei University. He has worked in Defense Agency for Technology and Quality. His research interests are flow measurements and control of fuel injection system in automotive.

Lee, Choong-Hoon received his B.S. (1985), M.S. (1987), and Ph.D. degrees (1996) in Mechanical Engineering from Seoul National University. He worked as a diesel engine development engineer for Daewoo Heavy Industry for six years. He was a visiting research fellow at the Engine Research Center at the University of Wisconsin-Madison in 1997. He has worked in the Department of Automotive Engineering at Seoul National University of Technology as a Professor since 2000. His research interests are the measurement and control of sprays and flows.

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Oh, D.S., Lee, C.H. Development of a new system for measuring the swirl ratio of an engine cylinder head under an unsteady flow condition. J Mech Sci Technol 33, 955–965 (2019). https://doi.org/10.1007/s12206-019-0152-1

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  • DOI: https://doi.org/10.1007/s12206-019-0152-1

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