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Numerical study on the cavitating flow through poppet valves concerning the influence of flow instability on cavitation dynamics

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Abstract

The flow dynamics of the cavitating jet through poppet valves inevitably suffers from the influence of varying openness, but the relevant mechanism remains unclear. Hence, the present study conducts a numerical study on the cavitating flow phenomenon inside poppet valves with two valve seat structures, in order to examine the flow mechanisms underlying varying cavitation phenomenon at different openness. According to the results, the overall cavitation distribution as well as the morphology feature follows a similar pattern due to the same inception mechanism irrelevant of the openness amount. However, examination of the dynamic behaviors confirms discernable variation in 2 coupling effects between flow instability and cavitation. The flow separation at the poppet trailing edge produces non-cavitation flow instability at 0.4 mm openness and attached cavitation at 0.8 mm, which amalgamate with upstream-shed vortex cavitation. The stably attached cavitation within the chamfered groove at 0.4 mm, as the source of non-cavitation flow instability, and the detached cavitation at 0.6 and 0.8 mm openness produce vortex cavitation at the free shearing side. The substantial variation in these two coupling effects contributes sensibly to the increase in the overall cavitation intensity. Meanwhile, the weakened coupling effect between the free shearing vortex and wall shearing vortex, as a consequence of increased potential core thickness at larger openness, leads to the attenuated vortex cavitation at the wall poppet side. Additionally, the vortex cavitation at free shearing side has a larger size in the chamfered valve seat case, due to the coupling of shed flow instability with the Kelvin-Helmholtz instability. As a conclusion, the inception mechanism for the cavitation remains unchanged with openness, while the difference in flow instabilities as well as the associated coupling effects with cavitation contributes to the variation in cavitation intensity.

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Acknowledgments

We are grateful for financial support from National Natural Science Foundation of China (No. 51975511), Guangdong Provincial Applied Science and Technology Research and Development Program (No. 2019A1515110844), and Youth Projects of Guangdong Education Department for Foundation Research and Applied Research (No. 2019KQNCX175).

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Authors and Affiliations

  1. College of Mechanical and Automotive Engineering, Zhaoqing University, Zhaoqing City, Guangdong Province, P.R. China

    Cong Yuan, Lisha Zhu, Du Zunling & He Li

  2. School of Mechanical Engineering and Automation, Northeastern University, Shenyang City, Liaoning Province, P.R. China

    Shiqi Liu & He Li

Authors
  1. Cong Yuan
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  2. Lisha Zhu
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  3. Shiqi Liu
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  4. Du Zunling
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  5. He Li
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Corresponding author

Correspondence to Lisha Zhu.

Additional information

Cong Yuan received the B.E., M.E. and Ph.D. degrees in Mechanical Engineering from Northeastern University, Shenyang, China, in 2019. He is currently a Lecturer with the School of Mechanical and Automotive Engineering, Zhaoqing University, China. His main research interests include cavitation in hydraulic valves, cavitating jet and cavitation erosion.

Lisha Zhu received the B.E., M.E. and Ph.D. degrees in Mechanical Engineering from Northeastern University, Shenyang, China, in 2012. She is currently a Professor with the School of Mechanical and Automotive Engineering, Zhaoqing University, China.

Shiqi Liu is a Ph.D. student at Northeastern University. He received his Master’s degree in Mechanical Engineering in 2018. He is currently completing a Ph.D. in Mechanical and Electrical Engineering at Northeastern University. His research interests include fluid optimization simulation. optimization of heat exchanger network for cooling water system.

Zunling Du received the B.E. degree in Agricultural Architectural Environment and Energy Engineering from Shenyang Agricultural University in 2008, and the M.S. degree in Mechanical Design and Theory in Northeast University in 2010. He is currently a Research Associate in Zhaoqing University, China. His main interests include hydraulic systems design and mechanical reliability design.

Li He received the Ph.D. degrees in Mechanical Engineering from Northeastern University, Shenyang, China, in 2005. He is currently a Professor with the School of Mechanical and Automotive Engineering, Zhaoqing University, China.

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Yuan, C., Zhu, L., Liu, S. et al. Numerical study on the cavitating flow through poppet valves concerning the influence of flow instability on cavitation dynamics. J Mech Sci Technol 36, 761–773 (2022). https://doi.org/10.1007/s12206-022-0124-8

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  • DOI: https://doi.org/10.1007/s12206-022-0124-8

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