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Research Papers: Other (Seals, Manufacturing)

Modeling of Gas Pressure and Dynamic Behavior of the Piston Ring Pack for the Two-Stroke Opposed-Piston Engine

[+] Author and Article Information
Wen-Bin Chen, De-Liang Liu, Feng-Ming Du, Zhi-Jun Yan

Key Laboratory of Ship-Machinery Maintenance
and Manufacture,
Dalian Maritime University,
Dalian 116026, China

Jiu-Jun Xu

Key Laboratory of Ship-Machinery Maintenance
and Manufacture,
Dalian Maritime University,
Dalian 116026, China
e-mail: xu.jiujun@163.com

Ruo-Xuan Huang

Department of Materials
Science and Engineering,
Dalian Maritime University,
Dalian 116026, China
e-mail: huan0237@ntu.edu.sg

Ze-Zhong Chen

Engine Part Research and Design Department,
China North Engine Research Institute (Tianjin),
Tianjin 300400, China

1Corresponding authors.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received January 23, 2018; final manuscript received July 12, 2018; published online August 13, 2018. Assoc. Editor: Joichi Sugimura.

J. Tribol 141(1), 012203 (Aug 13, 2018) (13 pages) Paper No: TRIB-18-1035; doi: 10.1115/1.4040925 History: Received January 23, 2018; Revised July 12, 2018

The piston ring pack and the ports on the cylinder linear wall have a great impact on the performance of the two-stroke opposed-piston engine. In this work, a piston ring pack model for this type of engine was generated to incorporate the exhaust ports. The effect of the exhaust ports was considered by modifying the existing friction force equation and the gas flow continuity equations. The developed model was implemented in an opposed-piston opposed-cylinder engine (a specific type of opposed-piston engine) to investigate the backpressure and the associated axial movement of all the rings of the piston ring pack under various working conditions. The results show that the gas pressure in all the regions of the piston ring pack and the axial movement of the rings are strongly affected by the exhaust ports. The gas pressure in some regions of the ring pack declines with the increase of the engine speed, while the effect of the combustion pressure (CP) on the axial movement of the ring pack can be neglected.

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References

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Figures

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Fig. 1

Illustration of the opposed-piston opposed-cylinder engine [23]

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Fig. 2

Illustration of the left cylinder and the inner exhaust piston

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Fig. 3

Contours of the rings and the piston: (a) the rings and (b) the piston

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Fig. 4

Combustion pressure under different operating modes

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Fig. 5

The position relationship between the ring pack and the exhaust ports

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Fig. 6

The velocity and acceleration of the piston at different revolution speeds: (a) velocity and (b) acceleration

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Fig. 7

Schematic of forces acting on ring

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Fig. 8

The areas for force calculation

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Fig. 10

Flowchart of computational procedure

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Fig. 11

The pressure in regions and the axial movement of the rings under the condition of 1500 rpm and CP4

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Fig. 12

The frictions of the rings under the condition of 1500 rpm and CP4

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Fig. 13

The pressure in regions under the condition of different engine speeds: (a) region 1, (b) region 2, (c) region 3, (d) region 4, (e) region 5, (f) region 6, (g) region 7, and (h) region 8

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Fig. 14

The axial movements of the rings under the condition of different engine speeds: (a) the top ring, (b) the second ring, (c) the third ring, (d) the fourth ring, and (e) the oil control ring

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Fig. 15

The pressure in regions under the condition of different combustion pressure: (a) region 1, (b) region 2, (c) region 3, (d) region 4, (e) region 5, (f) region 6, (g) region 7, and (h) region 8

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Fig. 16

The axial movements of the rings under the condition of different combustion pressure: (a) the top ring, (b) the second ring, (c) the third ring, (d) the fourth ring, and (e) the oil control ring

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