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Automotive Engineering ›› 2021, Vol. 43 ›› Issue (1): 34-43.doi: 10.19562/j.chinasae.qcgc.2021.01.005

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Study on the Influence of Coolant Flow Uniformity on the Thermal Deformation of Cylinder Liner

Yuhua Bi1,Siji Chen1,Guozhong Yao1(),Meiyuan Chen1,Lizhong Shen1,Kailue Xia2   

  1. 1.Kunming University of Science and Technology,Yunnan Key Laboratory of Internal Combustion Engine,Kunming 650500
    2.Kunming Yunnei Power Co. ,Ltd. ,Kunming 650500
  • Received:2020-06-01 Revised:2020-08-02 Online:2021-01-25 Published:2021-02-03
  • Contact: Guozhong Yao E-mail:zhongyaoguo@163. com

Abstract:

The coolant flow characteristics and the temperatures of the key locations of cylinder head and cylinder liner in a high?pressure common rail diesel engine are measured on test bench to provide the boundary conditions for thermal analysis. The fluid?solid coupling model for cylinder head, cylinder liners, coolant and cylinder block is established and the effects of coolant flow uniformity on thermal deformation of cylinder liner are studied by applying fluid?solid coupling heat transfer method, with the coolant flow characteristics in the water distribution holes of cylinder block and in the water holes of cylinder head are optimized. The results show that the cooling unevenness coefficient in optimized water jacket is reduced by 9.78% on average, the highest temperature of the water jacket in cylinder head and cylinder liner is lowered by 8.64% and 2.03% respectively, and the maximum thermal deformation of cylinder liner is decreased by 1.10%.

Key words: cylinder liner, fluid?solid coupling, temperature distribution, thermal deformation