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.

References

References
1.
RenJeng
,
Y.
,
1992
, “
Theoretical Analysis of Piston-Ring Lubrication—Part I: Fully Flooded Lubrication
,”
ASLE Trans.
,
35
(
4
), pp.
696
706
.
2.
Tan
,
Y. C.
, and
Ripin
,
Z. M.
,
2011
, “
Frictional Behavior of Piston Rings of Small Utility Two-Stroke Engine Under Secondary Motion of Piston
,”
Tribol. Int.
,
44
(
5
), pp.
592
602
.
3.
Akalin
,
O.
, and
Newaz
,
G. M.
,
2001
, “
Piston Ring-Cylinder Bore Friction Modeling in Mixed Lubrication Regime—Part I: Analytical Results
,”
ASME J. Tribol.
,
123
(
1
), pp.
211
218
.
4.
Shen
,
Y.
,
Jin
,
M.
,
Liu
,
Y.
, and
Zhu
,
F.
,
2017
, “
Characterization of Friction Condition Transition by Phase Space Trajectories
,”
ASME J. Tribol.
,
139
(
3
), p.
034501
.
5.
Kagnici
,
F.
, and
Akalin
,
O.
,
2014
, “
The Effect of Cylinder Bore Distortion on Lube Oil Consumption and Blow-By
,”
ASME J. Tribol.
,
136
(
1
), p.
011103
.
6.
Eweis
,
M.
,
1935
, “
Reibungs- Und Undichtigkeitsverluste an Kolbenringen
,” ETHZuRICH, Zürich, Switzerland.
7.
Furuhama
,
S.
, and
Tada
,
T.
,
2008
, “
On the Flow of Gas Through the Piston-Rings: 1st Report, the Discharge Coefficient and Temperature of Leakage Gas
,”
Trans. Jpn. Soc. Mech. Eng.
,
4
(
16
), pp.
684
690
.
8.
Furuhama
,
S.
, and
Tada
,
T.
,
2008
, “
On the Flow of Gas Through the Piston-Rings: 2nd Report, the Character of Gas Leakage
,”
Trans. Jpn. Soc. Mech. Eng.
,
27
(
174
), pp.
247
255
.
9.
Namazian
,
M.
, and
Heywood
,
J. B.
,
1982
, “
Flow in the Piston-Cylinder-Ring Crevices of a Spark-Ignition Engine: Effect on Hydrocarbon Emissions, Efficiency and Power
,”
SAE
Paper No. 820088.
10.
Tian
,
T.
,
Wong
,
V. W.
, and
Heywood
,
J. B.
,
1996
, “
A Piston Ring-Pack Film Thickness and Friction Model for Multigrade Oils and Rough Surfaces
,”
SAE
Paper No. 962032.
11.
Tian
,
T.
,
Wong
,
V. W.
,
Heywood
,
J. B.
, and
Noordzij
,
L. B.
,
1998
, “
Modeling Piston-Ring Dynamics, Blowby, and Ring-Twist Effects
,”
ASME J. Eng. Gas Turbines Power
,
120
(
4
), pp.
843
854
.
12.
Tian
,
T.
,
2002
, “
Dynamic Behaviours of Piston Rings and Their Practical Impact—Part 1: Ring Flutter and Ring Collapse and Their Effects on Gas Flow and Oil Transport
,”
Proc. Inst. Mech. Eng., Part J
,
216
(
4
), pp.
209
228
.
13.
Tian
,
T.
,
2002
, “
Dynamic Behaviours of Piston Rings and Their Practical Impact—Part 2: Oil Transport, Friction and Wear of Ring/Liner Interface and the Effects of Piston and Ring Dynamics
,”
Proc. Inst. Mech. Eng., Part J
,
216
(
4
), pp.
229
248
.
14.
Ortjohann
,
D. I. T.
, and
Voncken
,
D. I. A. P. J.
,
2008
, “
Piston Ring Dynamics Simulation Based on FEA Software
,”
MTZ Worldwide
,
69
(
12
), pp.
36
41
.
15.
He
,
T.
,
Lu
,
X.
,
Zou
,
D.
,
Guo
,
Y.
,
Li
,
W.
, and
Huang
,
M.
,
2014
, “
Thermomechanical Fatigue Life Prediction for a Marine Diesel Engine Piston Considering Ring Dynamics
,”
Adv. Mech. Eng.
,
2014
(
11
), pp.
1
10
.
16.
Liu
,
Y.
, and
Tian
,
T.
,
2017
, “
Development and Application of Ring-Pack Model Integrating Global and Local Processes—Part 1: Gas Pressure and Dynamic Behavior of Piston Ring Pack
,”
SAE Int. J. Engines
,
10
(
4
), pp.
1927
1939
.
17.
Kurbet
,
S. N.
, and
Kumar
,
R. K.
,
2007
, “
Finite Element Modelling of Piston-Ring Dynamics and Blow-by Estimation in a Four-Cylinder Diesel Engine
,”
Proc. Inst. Mech. Eng., Part D
,
221
(
11
), pp.
1405
1414
.
18.
Shi
,
F.
,
2011
, “
CFD Analysis of Oil/Gas Flow in Piston Ring-Pack
,”
SAE
Paper No. 2011-01-1406.
19.
Oliva
,
A.
,
Held
,
S.
,
Herdt
,
A.
, and
Wachtmeister
,
G.
,
2015
, “
Numerical Simulation of the Gas Flow Through the Piston Ring Pack of an Internal Combustion Engine
,”
SAE
Paper 2015-01-1302.
20.
Lyubarskyy
,
P.
, and
Bartel
,
D.
,
2016
, “
2D CFD-Model of the Piston Assembly in a Diesel Engine for the Analysis of Piston Ring Dynamics, Mass Transport and Friction
,”
Tribol. Int.
,
104
, pp.
352
368
.
21.
Kirner
,
C.
,
Halbhuber
,
J.
,
Uhlig
,
B.
,
Oliva
,
A.
,
Graf
,
S.
, and
Wachtmeister
,
G.
,
2016
, “
Experimental and Simulative Research Advances in the Piston Assembly of an Internal Combustion Engine
,”
Tribol. Int.
,
99
, pp.
159
168
.
22.
Oliva
,
A.
, and
Held
,
S.
,
2016
, “
Numerical Multiphase Simulation and Validation of the Flow in the Piston Ring Pack of an Internal Combustion Engine
,”
Tribol. Int.
,
101
, pp.
98
109.
23.
Hofbauer
,
P.
, “
Opposed Piston Opposed Cylinder (Opoc) Engine for Military Ground Vehicles
,”
SAE
Paper No. 2005-01-1548.
24.
Franke
,
M.
,
Huang
,
H.
,
Liu
,
J. P.
,
Geistert
,
A.
, and
Adomeit
,
P.
, “
Opposed Piston Opposed Cylinder (Opoc™) 450 Hp Engine: Performance Development by CAE Simulations and Testing
,”
SAE
Paper No. 2006-01-0277.
25.
Kalkstein
,
J.
,
Röver
,
W.
,
Campbell
,
B.
,
Zhong
,
L.
,
Huang
,
H.
,
Liu
,
J. P.
,
Tatur
,
M.
,
Geistert
,
A.
, and
Tusinean
,
A.
, “
Opposed Piston Opposed Cylinder (Opoc™) 5/10 kW Heavy Fuel Engine for UAVs and APUs
,”
SAE
Paper No. 2006-01-0278.
26.
Huo
,
M.
,
Huang
,
Y.
, and
Hofbauer
,
P.
,
2015
, “
Piston Design Impact on the Scavenging and Combustion in an Opposed-Piston, Opposed-Cylinder (OPOC) Two-Stroke Engine
,”
SAE
Paper No. 2015-01-1269.
27.
Han
,
D. C.
, and
Lee
,
J. S.
,
1998
, “
Analysis of the Piston Ring Lubrication With a New Boundary Condition
,”
Tribol. Int.
,
31
(
12
), pp.
753
760
.
28.
Maassen
,
F. J.
,
Dohmen
,
J.
,
Pischinger
,
S.
, and
Schwaderlapp
,
M.
,
2005
, “
Engine Friction Reduction
,”
MTZ Worldwide
,
66
(
7–8
), pp.
30
33
.
29.
Schommers
,
J.
,
Scheib
,
H.
,
Hartweg
,
M.
, and
Bosler
,
A.
,
2013
, “
Minimising Friction in Combustion Engines
,”
MTZ Worldwide
,
74
(
7–8
), pp.
28
35
.
30.
Shapiro
,
A. H.
,
1953
,
The Dynamics and Thermodynamics of Compressible Fluid Flow
, The Ronald Press Company, New York.
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