Volume 02 Issue 10-2022
65
International Journal of Advance Scientific Research
(ISSN
–
2750-1396)
VOLUME
02
I
SSUE
10
Pages:
65-74
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
METADATA
IF
–
7.356
A
BSTRACT
The article presents the results of a computational and experimental study of a passenger car with a spark
ignition engine running on liquefied petroleum gas (LPG) with dimethyl ether (DME) additives.
Recommendations are given on the modernization of gas cylinders for refuelling LPG with DME additives,
as well as studies of a passenger car running on composite gas fuels.
K
EYWORDS
Passenger car, liquefied petroleum gas, dimethyl ether.
I
NTRODUCTION
It is known that the use of environmentally
friendly alternative motor fuels instead of oil is
the most rational solution to modern energy and
environmental problems in the field of transport,
Journal
Website:
http://sciencebring.co
m/index.php/ijasr
Copyright:
Original
content from this work
may be used under the
terms of the creative
commons
attributes
4.0 licence.
Research Article
IMPROVING THE PERFORMANCE OF A PASSENGER CAR
WITH A SPARK IGNITION ENGINE USING LIQUEFIED
PETROLEUM GAS WITH THE ADDITION OF DEMETHYL
ETHER
Submission Date:
October 01, 2022,
Accepted Date:
October 15, 2022,
Published Date:
October 25, 2022
Crossref doi:
https://doi.org/10.37547/ijasr-02-10-11
O.Z. Odilov
Phd In Technical Sciences, Associate Professor, Fergana Polytechnic Institute, Fergana, Uzbekistan
D.A. Mirkomilov
Master's Student, Fergana Polytechnic Institute, Fergana, Uzbekistan
Volume 02 Issue 10-2022
66
International Journal of Advance Scientific Research
(ISSN
–
2750-1396)
VOLUME
02
I
SSUE
10
Pages:
65-74
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
METADATA
IF
–
7.356
in particular road transport. The use of dimethyl
ether (DME) as a motor fuel will expand the use of
environmentally friendly alternative motor fuels,
reduce fuel supply tensions, reduce oil production
and refining, and improve the performance,
including the environmental performance of
vehicles running on this type of fuel [1-4].
The transfer of cars to DME power supply in
whole or in part with minimal design and
adjustment changes solves several environmental
problems of transport and this connection is a
very urgent task [5-9].
M
ATERIALS AND METHODS
In many countries of the world, scientific and
practical work is being actively carried out on the
use of DME as the main or additional fuel for
internal combustion engines [1, 2, 3].
Most of these scientific works are devoted to the
use of DME as a substitute for diesel fuel (DF) and
several programs have been carried out for its use
as a motor fuel for urban and factory transport
[10-17].
In most of these works, it was found that when
using DME as the main fuel (complete
replacement of DF), the control and design of the
fuel supply system become more complicated and
a number of problems arise associated with the
unstable operation of a diesel engine. All
structural and technological changes in the diesel
fuel supply system are carried out in order to
compensate for the low calorific value and
viscosity of DME compared to DF. Several
scientific works have also been carried out
related to the use of DME as an additive to
liquefied petroleum gas (LPG) in order to improve
the performance of an internal combustion
engine (ICE) with spark ignition [17-22].
In these works, using DME as an additive to LPG,
some reductions in power and torque values were
obtained for ICE running on base fuels - gasoline
and LPG. At the same time, there is some decrease
in emissions of harmful substances - carbon
monoxide (CO) and hydrocarbon (CH) compared
to base fuels [23-37].
However, at the same time, there are no results of
scientific works related to studies of the
performance of cars running on LPG with DME
additives.
Table 1. Comparative indicators of various motor fuels
Indicators
Fuel
Petrol
Diesel
fuel
CNG
LPG
DME
Chemical
formula
C
8
H
18
C
15
H
32
CH
4
C
3
H
8
C
4
H
8
C
2
H
6
O
Molecular
mass
114,5
190
16
44
58
46,07
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67
International Journal of Advance Scientific Research
(ISSN
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2750-1396)
VOLUME
02
I
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10
Pages:
65-74
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
METADATA
IF
–
7.356
Elemental
Composition:
C
85.5
86
74.6
82
82
52.2
H
14.4
13
25.4
18
18
13
O
0.1
one
—
—
—
34.8
C/H ratio
5.3
6.62
2.93
4.55
4.55
4.02
Density, g/cm
3
(kg/m
3
)
liquid phase
0.72
0.85
0.5
0.509
0.582
0.68
gas phase
1.07
1.23
0.68
2.018
2.703
-2.1
Net calorific
value, MJ/kg of
fuel
44
42
49.5
46.5
45.5
28.4
combustible
mixture
d=Nmax
3.1
2.09
2.63
3.02
3.02
1.06
Ignition
temperature
(self-ignition),
℃
470…530
290…310
680…700
475…580
475…580
235
-220
-430
-570
-520
-520
-350
Flammability
limit in air, %
lower
1.4
0.6
5.3
1.8
1.8
3.4
upper
7.4
6.5
fifteen
9.5
9.5
eighteen
Flammability
limit in air, %
lower
1.4
0.6
5.3
1.8
1.8
3.4
upper
7.4
6.5
fifteen
9.5
9.5
eighteen
Excess air
coefficient
corresponding
to:
flammable limit
0.7…1.1
0.9…5.0
0.7…1.3
0.7…1.2
0.7…1.2
3.4…34
maximum
power
0.85…0.95
1.3…1.5
1.05…1.15
0.3…1.05
0.3…1.05
3.0…4.5
Theoretically
required
amount of air
for complete
combustion of
14.85
14.35
17.1
15.2
15.2
9
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International Journal of Advance Scientific Research
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VOLUME
02
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SJIF
I
MPACT
FACTOR
(2021:
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)
(2022:
5.636
)
METADATA
IF
–
7.356
fuel, kg/kg
Based on the foregoing, the purpose of this work was to study the performance of a passenger car with a
spark ignition engine with the addition of DME.
Description of DME, fuel supply system and experimental vehicle.
In order to use for comparative analysis, indicators of various fuels are given (Table 1).
Figure 1. Changes in saturated vapour pressure and density of composite gas fuel depend on
temperature.
From the above data it follows that at certain
concentrations of DME in the composition of LPG,
the combustibility (density, heat of combustion,
flammability limits, ignition temperature) of the
composite gas fuel can improve. It should be
noted that the saturation vapour pressure (SVP)
and the density of the composite gas fuel (LPG +
DME) have a significant effect on the efficiency of
supplying gas fuel to the engine (Fig. 1) and on the
performance of a car running on this type of fuel.
At the same time, the main element - gas cylinders
of the fuel supply system, occupies a special place
in order to fulfil the requirements for the safe
operation of the car [38-44].
The used LPG gas cylinders when using DME must
be modernized, i.e. elements (float, seals, etc.) of
the multi-valve device made of plastic, and rubber
must be replaced with metal ones (Fig. 2).
The Nexia 3 car prepared for testing (Fig. 3) was
equipped with three systems (gasoline,
compressed natural gas (CNG), and liquefied
petroleum gas), which allows comparative
Volume 02 Issue 10-2022
69
International Journal of Advance Scientific Research
(ISSN
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2750-1396)
VOLUME
02
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10
Pages:
65-74
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
METADATA
IF
–
7.356
studies of its performance for gasoline, CNG, LPG,
as well as for LPG with additives. Calculated
comparative indicators of the investigated motor
fuels have been established.
Figure 2. Nexia 3 car prepared for testing
R
ESULTS AND DISCUSSION
Modernized and tested according to the requirements of LPG gas cylinders in order to use them for
composite gas fuels (LPG with DME additives) in the research process.
Figure 3. Upgraded LPG gas cylinders.
For the purpose of comparative research on
various fuels (gasoline, CNG, LPG, LPG with
various DME additives), a Nexia passenger car
with three fuel supply systems was prepared. The
Volume 02 Issue 10-2022
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International Journal of Advance Scientific Research
(ISSN
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VOLUME
02
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Pages:
65-74
SJIF
I
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FACTOR
(2021:
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)
(2022:
5.636
)
METADATA
IF
–
7.356
preliminary test (maximum speed, acceleration
time to 100 km/h, CO and CH emissions at idle)
showed results close to those of the base car [45-
58]. In order to eliminate the effect of the catalyst
converter on exhaust emissions, the base unit has
been replaced with a simple converter housing.
Comparative environmental performance of a
passenger car running on various fuels (gasoline,
CNG, LPG, LPG with various additives of 5, 10,
15% DME) will be evaluated at speeds of 40, 60,
80, 100 km/h of the vehicle.
C
ONCLUSION
Based on the analysis of the work performed on
the use of LPG with DME additives as a motor fuel
for a spark ignition engine, it was found that the
power, torque and CO and CH emissions of an LPG
engine with DME additives are slightly reduced.
In all cases, the performance and exhaust
emissions of a passenger car running on LPG with
various DME additives have not been fully
investigated.
In preparation for these studies, LPG gas
cylinders were upgraded to fill LPG with various
DME additives, and a Nexia vehicle with three fuel
supply systems was prepared for these types of
studies.
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