A hydrogen-fueled two-stroke prototype demonstrator based on a 9.9 hp (7.4 kW) production gasoline marine outboard engine is presented, which, while matching the original engine's rated power output on hydrogen, achieves a best-point gross indicated thermal efficiency (ITE) of 42.4% at the ICOMIA mode 4 operating point, corresponding to 80% and 71.6% of the rated engine speed and torque, respectively. The brake thermal efficiency (BTE) at the rated power is 32.3%. Preliminary exhaust gas measurements suggest that the engine could also meet the most stringent CARB 5-Star marine spark-ignition emission standards limiting HC + NOx emissions to 2.5 g/kWh without any after-treatment. These are realized in a cost-effective concept around a proven two-stroke base engine and a low-pressure direct-injected gaseous hydrogen (LPDI GH2) system, which employs no additional fuel pump and is uniquely adapted from volume production components. Later fuel injection is found to improve thermal efficiency at the expense of increased NOx emissions and, at the extreme, increased cyclic variation. These observations are hypothesized and supported by phenomenological inferences of the observed trends of combustion duration, NOx concentration, and indicated mean effective pressure (IMEP) variance to be due to increasing charge stratification with the later timings. This work outlines the pathway—including investigations of several fuel delivery strategies with limited success—leading to the current status, including design, modeling with GT-POWER, delivery of lube oil, lubrication issues using hydrogen, and calibration sweeps. The experimental results comprising steady-state dynamometer performance, cylinder pressure traces, NOx emission measurements, along with heat release analyses, support the reported numbers and the key finding that late fuel injection timing and charge stratification drive the high efficiencies and the NOx trade-off; this is discussed and forms the basis for future work.

References

References
1.
Eichlseder
,
H.
, and
Klell
,
M.
,
2010
,
Wasserstoff in der Fahrzeugtechnik—Erzeugung, Speicherung, Anwendung
,
Vieweg + Teubner Verlag
,
Wiesbaden
.
2.
Furuhama
,
S.
,
1979
, “
Two-Stroke Hydrogen Injection Engine
,”
Int. J. Hydrogen Energy
,
4
(
6
), pp.
571
576
.10.1016/0360-3199(79)90084-3
3.
Furuhama
,
S.
, and
Kobayashi
,
Y.
,
1982
, “
A Liquid Hydrogen Car With a Two-Stroke Direct Injection Engine and LH2 Pump
,”
Int. J. Hydrogen Energy
,
7
(
10
), pp.
809
820
.10.1016/0360-3199(82)90072-6
4.
Furuhama
,
S.
, and
Kobayashi
,
Y.
,
1984
, “
Development of a Hot-Surface-Ignition Hydrogen Injection Two-Stroke Engine
,”
Int. J. Hydrogen Energy
,
9
(
3
), pp.
205
213
.10.1016/0360-3199(84)90120-4
5.
Wallner
,
T.
,
Lohse-Busch
,
H.
, and
Shidore
,
N.
,
2009
, “
Operating Strategy for a Hydrogen Engine for Improved Drive-Cycle Efficiency and Emissions Behavior
,”
Int. J. Hydrogen Energy
,
34
(
10
), pp.
4617
4625
.10.1016/j.ijhydene.2008.07.099
6.
Grabner
,
P.
,
Eichlseder
,
H.
,
Gerbig
,
F.
, and
Gerke
,
U.
,
2006
, “
Optimisation of a Hydrogen Internal Combustion Engine With Inner Mixture Formation
,”
1st International Symposium on Hydrogen Internal Combustion Engines
, Graz, Austria, September 28–29, pp.
59
70
.
7.
Verhelst
,
S.
, and
Sierens
,
R.
,
2001
, “
Hydrogen Engine-Specific Properties
,”
Int. J. Hydrogen Energy
,
26
, pp.
987
990
.10.1016/S0360-3199(01)00026-X
8.
Verhelst
,
S.
, and
Wallner
,
T.
,
2009
, “
Hydrogen-Fueled Internal Combustion Engines
,”
Prog. Energy Combust. Sci.
,
35
(
6
), pp.
490
527
.10.1016/j.pecs.2009.08.001
9.
Ford Motor Co.,
2012
, “Ford Launches Production of Hydrogen Internal Combustion Engines for Delivery to Customers,” accessed June 15, 2012, http://media.ford.com/article_display.cfm?article_id=23844
10.
BMW,
2012
, “BMW EfficientDynamics: BMW CleanEnergy,” accessed June 15, 2012, http://www.bmw.com/com/en/insights/technology/efficient_dynamics/phase_2/clean_energy/bmw_hydrogen_7.html
11.
Morgan
,
E.
and
Lincoln
,
R.
,
1990
, “
Duty Cycle for Recreational Marine Engines
,”
SAE
Technical Paper No. 901596. 10.4271/901596
12.
Office of Boating Safety,
2012
, “Safe Boating Guide,” Transport Canada, accessed June 15, 2012, http://www.tc.gc.ca/publications/en/tp511/pdf/hr/tp511e.pdf
13.
Caley
,
D.
, and
Cathcart
,
G.
,
2006
, “
Development of a Natural Gas Spark Ignited Direct Injection Combustion System
,” NGV2006, Cairo, accessed June 15, 2012, http://orbeng.com.au/download-document/332-2006-ngv.html
14.
Ambler
,
M.
, and
Zocchi
,
A.
,
2001
, “
Development of the Aprilia DITECH 50 Engine
,”
SAE
Technical Paper No. 2001-01-1781. 10.4271/2001-01-1781
15.
Blair
,
G. P.
,
1999
,
Design and Simulation of Two-Stroke Engines
,
Society of Automotive Engineers
,
Warrendale, PA
.
16.
Heywood
,
J. B.
, and
Sher
,
E.
,
1999
,
The Two-Stroke Cycle Engine: Its Development, Operation, and Design
,
Taylor & Francis, Philadelphia
, PA.
17.
Ghojel
,
J. I.
,
2010
, “
Review of the Development and Applications of the Wiebe Function: A Tribute to the Contribution of Ivan Wiebe to Engine Research
,”
Int. J. Eng. Res.
,
11
(
297
), pp.
297
312
.10.1243/14680874JER06510
18.
Heywood
,
J. B.
,
1988
,
Internal Combustion Engine Fundamentals
,
McGraw-Hill
,
New York
, p.
840
.
19.
White
,
C. M.
,
Steeper
,
R. R.
, and
Lutz
,
A. E.
,
2006
, “
The Hydrogen-Fueled Internal Combustion Engine: A Technical Review
,”
Int. J. Hydrogen Energy
31
, pp.
1292
1305
.10.1016/j.ijhydene.2005.12.001
20.
Murillo
,
S.
,
Míguez
,
J. L.
,
Porteiro
,
J.
,
Hernández
,
J. J.
, and
López-González
,
L. M.
,
2003
, “
Viability of LPG Use in Low-Power Outboard Engines for Reduction in Consumption and Pollutant Emissions
,”
Int. J. Energy. Res.
,
27
, pp.
467
480
.10.1002/er.889
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