The low vapor pressure of ethanol and the high latent heat of vaporization at low temperatures cause the difficulties of cold start in a flex fuel vehicle when it is fueled with pure ethanol. Preheating fuel is one of the effective methods to solve the above cold start problem. Thus, it is crucial to obtain the fuel temperature distribution in the heating system for fuel preheating process. For this purpose, the numerical analysis is adopted here to simulate the fuel preheating process at a cold start phase and explore the change of the fuel temperature field under different influence factors. The results indicate that the starting temperature has obvious impact on the temperature field distribution in the heating chamber and preheating time but has little effect on the volume of cold fuel in the connecting line at the end of heating. When the starting temperature is −5 °C, the preheating time is 8.3 s. When the starting temperature increases up to 15 °C, the preheating time will decrease as 4.9 s. Furthermore, the lower the starting temperature is, the higher the overall temperature of the heating chamber is. The installing angle of injectors has some influence on the temperature field distribution, and the cold fuel ratio reduces slightly when the angle increases from 30 deg to 60 deg. The calculation results indicate that the temperature of fuel at the injector inlet is above 20 °C, and the fuel injected during the first three cycles of the engine operation is hot fuel.

Reference

Reference
1.
Roberts
,
A.
,
Brooks
,
R.
, and
Shipway
,
P.
,
2014
, “
Internal Combustion Engine Cold-Start Efficiency: A Review of the Problem, Causes and Potential Solutions
,”
Energy Convers. Manage.
,
82
, pp.
327
350
.
2.
Yanowitz
,
J.
,
Knoll
,
K.
,
Kemper
,
J.
,
Luecke
,
J.
, and
McCormick
,
R. L.
,
2013
, “
Impact of Adaptation on Flex-Fuel Vehicle Emissions When Fueled With E40
,”
Environ. Sci. Technol
,
47
(
6
), pp.
2990
2997
.
3.
Nicolas
,
G.
, and
Metghalchi
,
H.
,
2016
, “
Development of the Rate-Controlled Constrained-Equilibrium Method for Modeling of Ethanol Combustion
,”
ASME J. Energy Resour. Technol.
,
138
(
2
), p.
022205
.
4.
Wei
,
Y.,J.
,
Wang
,
K.
,
Wang
,
W. R.
,
Liu
,
S. H.
, and
Yang
,
Y. J.
,
2013
, “
Contribution Ratio Study of Fuel Alcohol and Gasoline on the Alcohol and Hydrocarbon Emissions of a Gasohol Engine
,”
ASME J. Energy Resour. Technol.
,
136
(
2
), p.
022201
.
5.
Dardiotis
,
C.
,
Fontaras
,
G.
,
Marotta
,
A.
,
Martini
,
G.
, and
Manfredi
,
U.
,
2015
, “
Emissions of Modern Light Duty Ethanol Flex-Fuel Vehicles Over Different Operating and Environmental Conditions
,”
Fuel
,
140
, pp.
531
540
.
6.
Fernando de
,
O. J.
,
Fernando
,
L.
,
Franco da Silva
,
L. L.
,
Luiz Fernando de
,
B. O.
, and
Tulio
,
I. M. C.
,
2015
, “
Warm Start Robustness Improvement Using the Heated Cold Start System in Flex Fuel Engines
,”
SAE
Paper No. 2015-36-0202.
7.
Krenus
,
R.
,
Passos
,
M. R. V.
,
Ortega
,
T.
,
Mowery
,
K.
,
Kim
,
Y. J.
,
Lucille
,
G. L.
,
Lee
,
K.
,
Park
,
C. J.
, and
Han
,
K.
,
2014
, “
Ethanol Flex Fuel System With Delphi Heated Injector Application
,”
SAE
Paper No. 2014-01-1369.
8.
Cordeiro de Melo
,
T. C.
,
Machado
,
G. B.
,
Belchior Carlos
,
R. P.
,
Cola
,
M. J.
,
Barros
,
J. E. M.
,
Oliveira
,
E. J.
, and
Oliveira
,
D. G. D.
,
2012
, “
Hydrous Ethanol–Gasoline Blends—Combustion and Emission Investigations on a Flex-Fuel Engine
,”
Fuel
,
97
, pp.
796
804
.
9.
Monteiro
,
S. L. C.
,
Barbosa
,
R. F.
,
Oliveira
,
F. M. V.
,
Leal
,
W. F.
, and
Valdivino da Silva
,
Z.
,
2010
, “
Heating System for Ethanol and Intake Air—Numerical Model and Experimental Validation at Cold Start in a Flex Fuel Vehicle With Emissions Analysis
,”
SAE
Paper No. 2010-36-0412.
10.
Charoenphonphanich
,
C.
,
Imerb
,
W.
,
Karin
,
P.
,
Chollacoop
,
N.
, and
Hanamura
,
K.
,
2011
, “
Low Temperature Starting Techniques for Ethanol Engine Without Secondary Fuel Tank
,”
SAE
Paper No. 2011-32-0552.
11.
Malagó Amaral
,
T. M.
,
Moreira
,
F.
,
Yoshino
,
F. J.
,
Cavalhieri
,
H. M.
,
Diniz da Cruz
,
R. J. S.
, and
Schadler
,
W.
,
2014
, “
Self-Controlled Electronic Cold Start System for Flexible Fuel Vehicles
,”
SAE
Paper No. 2014-36-0208.
12.
Monteiro Sales
,
L. C.
, and
Sodré
,
K. R.
,
2012
, “
Cold Start Emissions of an Ethanol-Fuelled Engine With Heated Intake Air and Fuel
,”
Fuel
,
95
, pp.
122
125
.
13.
Monteiro Sales
,
L. C.
, and
Sodré
,
K. R.
,
2012
, “
Cold Start Characteristics of an Ethanol-Fuelled Engine With Heated Intake Air and Fuel
,”
Appl. Therm. Eng.
,
40
, pp.
198
201
.
14.
Iodice
,
P.
,
Senatore
,
A.
,
Langella
,
G.
, and
Amoresano
,
A.
,
2016
, “
Effect of Ethanol–Gasoline Blends on CO and HC Emissions in Last Generation SI Engines Within the Cold-Start Transient: An Experimental Investigation
,”
Appl. Energy
,
179
, pp.
182
190
.
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