In this study, the influence of the charge motion on the internal combustion in a spark ignition sewage gas-driven engine (150 kW) for combined heat and power (CHP) units was investigated. For this purpose, the geometry of the combustion chamber in the immediate vicinity to the inlet valve seats was modified. The geometrical modification measures were conducted iteratively by integrative determination of the swirl motion on a flow bench, by laser-optical methods and consecutively by combustion analysis on a test engine. Two different versions of cylinder heads were characterized by dimensionless flow and swirl numbers prior to testing their on-engine performance. Combustion analysis was conducted with a cylinder pressure indication system for partial and full load, meeting the mandatory NOx limit of 500 mg m−3. Subsuming the flow bench results, the new valve seat design has a significant enhancing impact on the swirl motion but it also leads to disadvantages concerning the volumetric efficiency. A comparative consideration of the combustion rate delivers that the increased swirl motion results in a faster combustion, hence in a higher efficiency. In summary, the geometrical modifications close to the valve seat result in increased turbulence intensity. It was proven that this intensification raises the ratio of efficiency by 1.6%.

References

References
1.
Konstantinoff
,
L.
,
Pfeifer
,
C.
,
Pillei
,
M.
,
Trattnig
,
U.
,
Dornauer
,
T.
, and
Möltner
,
L.
,
2017
, “
Optimization of the Charge Motion in Sewage Gas-Driven Internal Combustion Engines for Combined Heat and Power Units
,”
Int. J. Mech.
,
11
, pp.
82
91
.http://www.naun.org/main/NAUN/mechanics/2017/a282003-003.pdf
2.
Yao-Hua
,
J.
, 2009, “
Research of Biogas as Fuel for Internal Combustion Engine
,”
Asia-Pacific Power and Energy Engineering Conference
(
APPEEC
), Wuhan, China, Mar. 27–31, pp.
1
4
.
3.
Kim
,
Y.
,
Kawahara
,
N.
,
Tomita
,
E.
,
Oshibe
,
H.
, and
Nishikawa
,
K.
,
2015
, “
Effect of Bio-Gas Contents on Si Combustion for a Co-Generation Engine
,”
SAE
Paper No. 2015-01-1946.
4.
Wheeler
,
J.
,
Stein
,
J.
, and
Hunter
,
G.
,
2014
, “
Effects of Charge Motion, Compression Ratio, and Dilution on a Medium Duty Natural Gas Single Cylinder Research Engine
,”
SAE Int. J. Engines
,
7
(
4
), pp.
1650
1664
.
5.
Abidin
,
Z.
,
Hoag
,
K.
,
Mckee
,
D.
, and
Badain
,
N.
,
2016
, “
Port Design for Charge Motion Improvement Within the Cylinder
,”
SAE
Paper No. 2016-01-0600.
6.
Ogink
,
R.
, and
Babajimopoulos
,
A.
,
2016
, “
Investigating the Limits of Charge Motion and Combustion Duration in a High-Tumble Spark-Ignited Direct-Injection Engine
,”
SAE Int. J. Engines
,
9
(
4
), pp. 2129–2141.
7.
Pischinger
,
R.
,
Klell
,
M.
, and
Sams
,
T.
,
2009
,
Thermodynamik der Verbrennungskraftmaschine
(Der Fahrzeugantrieb),
3rd ed.
,
Springer
,
New York
.
8.
Heywood
,
J.
,
1988
,
Internal Combustion Engine Fundamentals
,
1st ed.
,
McGraw-Hill
, New York.
9.
Fujimoto
,
M.
,
2002
, “
Effect of Combustion Chamber Shape on Tumble Flow, Squish-Generated Flow and Burn Rate
,”
JSAE Rev.
,
23
(
3
), pp.
291
296
.
10.
Zhang
,
D.
, and
Hill
,
P. G.
,
1996
, “
Effect of Swirl on Combustion in a Short Cylindrical Chamber
,”
Combust. Flame
,
106
(
3
), pp.
318
332
.
11.
Porpatham
,
E.
,
Ramesh
,
A.
, and
Nagalingam
,
B.
,
2013
, “
Effect of Swirl on the Performance and Combustion of a Biogas Fuelled Spark Ignition Engine
,”
Energy Convers. Manage.
,
76
, pp.
463
471
.
12.
Tippelmann
,
G.
,
1977
, “
A New Method of Investigation of Swirl Ports
,”
SAE
Paper No. 770404.
13.
Corberán
,
J. M.
, and
Pérez
,
R.
,
1998
, “
An Alternative Technique for Swirl Measurement
,”
SAE
Paper No. 980486.
14.
Li
,
Y.
,
Zhao
,
H.
,
Peng
,
Z.
, and
Ladommatos
,
N.
,
2001
, “
Analysis of Tumble and Swirl Motions in a Four-Valve Si Engine
,”
SAE
Paper No. 2001-01-3555.
15.
Paulweber
,
M.
, and
Lebert
,
K.
, 2014,
Mess- und Prüfstandstechnik: Antriebsstrangentwicklung - Hybridisierung - Elektrifizierung
, 1st ed., Springer Vieweg, Wiesbaden, Germany.
16.
Rosin
,
P.
, and
Rammler
,
E.
,
1933
, “
The Laws Governing the Fineness of Powdered Coal
,”
J. Inst. Fuel
,
7
, pp.
29
36
.
17.
Kuratle
,
R.
,
1995
,
Motorenmesstechnik
,
Vogel
,
Würzburg, Germany
.
18.
Zeldovich
,
Y. B.
, and
Sunyaev
,
R. A.
, eds.,
1992
,
Selected Works of Yakov Borisovich Zeldovich
, Vol.
I
,
Princeton University Press
,
Princeton, NJ
.
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