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Proper orthogonal decomposition analysis of fuel spray structure variation in a spark-ignition direct-injection optical engine

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Abstract

For spark-ignition direct-injection (SIDI) engines in which fuel is injected directly in the cylinder, large amount of in-cylinder mixture variation on a cyclic basis could adversely influence the combustion quality and lead to more fuel consumption and excessive engine emissions. In this study, multiple cycles of intake air flow fields and their effects on fuel spray structure were investigated experimentally in an optical SIDI engine. Proper orthogonal decomposition (POD) was utilized to identify and quantify the cyclic variations of intake air motions and spray the pattern in the cylinder. Results show that the pattern of POD mode 1 resembles the ensemble-averaged structure of intake air velocity field. Other higher POD modes are useful to identify the fluctuations of the flow. The cycle-to-cycle difference of in-cylinder air flow motion also influences the variations of spray structure on a cyclic basis, which can be unambiguously quantified by analyzing the POD modes 1 and 2 of the spray pattern. Whereas the first mode exhibits the variation for the dominant portion of spray structure, the second mode captures the subtle differences in the positions of discrete fuel spray plumes under the influence of intake air. Overall, POD can be useful in identifying and quantifying the cyclic variations of the intake air motion and spray structure in the cylinder of running engine conditions.

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Acknowledgments

This research is sponsored by General Motors R&D Corporation (USA) and National Natural Science Foundation of China (NSFC) under grants No. 51076093/E060702 and 51176115/E060404, and carried out at the National Engineering Laboratory for Automotive Electronic Control Technology of the Shanghai Jiao Tong University. Additional funding support on this research to D.L.S. Hung has also been provided by the 2009 Program for New Century Excellent Talents in University by the Ministry of Education (MOE), China.

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Authors and Affiliations

  1. National Engineering Laboratory for Automotive Electronic Control Technology, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China

    Hao Chen, David L. S. Hung, Min Xu & Jie Yang

  2. University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai, China

    David L. S. Hung & Hanyang Zhuang

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  1. Hao Chen
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  2. David L. S. Hung
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  3. Min Xu
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  4. Hanyang Zhuang
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  5. Jie Yang
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Correspondence to David L. S. Hung.

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Chen, H., Hung, D.L.S., Xu, M. et al. Proper orthogonal decomposition analysis of fuel spray structure variation in a spark-ignition direct-injection optical engine. Exp Fluids 55, 1703 (2014). https://doi.org/10.1007/s00348-014-1703-y

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  • DOI: https://doi.org/10.1007/s00348-014-1703-y

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