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Numerical investigation on the operating characteristics of the cylinder liners of a turbocharged diesel engine

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Abstract

The main operating characteristics of cylinder liner include the liner deformation and coolant flow. The insufficient coolant flow can lead to greater deformation of cylinder liner and hence worse engine performance and emissions performance. However, previous works have been done focusing on the characteristics of liner bore deformation and comprehensive coolant flow and the importance of the characteristics of different loads on liner deformation has not been recognized when analyzing cylinder liner. Therefore, the aim of this study is to reveal the characteristics of the coolant flow around cylinder liners and the effect of different loads on liner deformation. A simulation model of a diesel engine was developed to analyze coolant flow characteristics, deformation, and temperature distribution of cylinder liners in steady-state conditions. The effects of thermal stress, bolt preload, firing pressure, and piston side thrust on deformations of cylinder liners were analyzed in various designed conditions based on simulation results. It is found from the analysis results that the temperature of the cylinder liners gradually decreases from the top to the bottom. Meanwhile, the temperature gradient of the upper portion of the cylinder liner is greater than that of the middle portion or the bottom portion due to uneven distributions of the coolant flow in the cooling water jackets of different cylinder liners. In addition, the coolant flow velocity in the valve bridge area is lower than the target value. The expansion and compression deformations of the liner 1 and liner 4 are greater than those of other two liners, and the comprehensive deformation trends of different cylinder liners are similar in various loading conditions. The thermal load has the greatest impact on liner deformation because the total liner deformation contributed by the impacts of different types of loads looks similar to the liner deformation caused by only the thermal load.

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Abbreviations

a:

Thermal stress

b:

Bolt preload

c:

Firing pressure

d:

Piston side thrust

BP:

Pressure measurement location in the water jacket of the cylinder liner

BT:

Temperature measurement location in the water jacket of the cylinder liner

CP:

Pressure measurement location in the water jacket of the cylinder head

CT:

Temperature measurement location in the water jacket of the cylinder head

CFD:

Computational fluid dynamics

Comb.:

Combination

Comp.:

Computational results

Exp.:

Experimental results

TDC:

Top dead center

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Acknowledgement

This work was supported by the National Natural Science Foundation of China [Grant Number: 51765025]. The authors are grateful for the support given by the foundation and the Yunnan Province Innovation Team.

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Authors and Affiliations

  1. Yunnan Province Key Laboratory of Internal Combustion Engines, Kunming University of Science and Technology, Kunming, 650 500, China

    Yuhua Bi, Peng Wang, Rong Xiang, Jilin Lei, Lizhong Shen & Qianfan Xin

  2. Chengdu Galaxy Power Co., Ltd, Chengdu, 610 505, China

    Jun Wen

Authors
  1. Yuhua Bi
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  2. Peng Wang
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  3. Rong Xiang
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  4. Jun Wen
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  5. Jilin Lei
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  6. Lizhong Shen
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  7. Qianfan Xin
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Correspondence to Peng Wang or Qianfan Xin.

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Bi, Y., Wang, P., Xiang, R. et al. Numerical investigation on the operating characteristics of the cylinder liners of a turbocharged diesel engine. Sādhanā 46, 150 (2021). https://doi.org/10.1007/s12046-021-01679-0

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  • DOI: https://doi.org/10.1007/s12046-021-01679-0

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