Computational Investigation of Air-Gas Venturi Mixer for Powered Bi-Fuel Diesel Engine
In a bi-fuel diesel engine, the carburetor plays a vital
role in switching from fuel gas to petrol mode operation and viceversa.
The carburetor is the most important part of the fuel system of
a diesel engine. All diesel engines carry variable venturi mixer
carburetors. The basic operation of the carburetor mainly depends on
the restriction barrel called the venturi. When air flows through the
venturi, its speed increases and its pressure decreases. The main
challenge focuses on designing a mixing device which mixes the
supplied gas is the incoming air at an optimum ratio. In order to
surmount the identified problems, the way fuel gas and air flow in
the mixer have to be analyzed. In this case, the Computational Fluid
Dynamics or CFD approach is applied in design of the prototype
mixer. The present work is aimed at further understanding of the air
and fuel flow structure by performing CFD studies using a software
code. In this study for mixing air and gas in the condition that has
been mentioned in continuance, some mixers have been designed.
Then using of computational fluid dynamics, the optimum mixer has
been selected. The results indicated that mixer with 12 holes can
produce a homogenous mixture than those of 8-holes and 6-holes
mixer. Also the result showed that if inlet convergency was smoother
than outlet divergency, the mixture get more homogenous, the reason
of that is in increasing turbulence in outlet divergency.
[1] Maxwell T. T. and Jones J. C., "Alternative Fuels: Emissions,
Economics and Performance", USA Society of Automotive Engineers,
SAE Inc, 1995.
[2] Devarajan R., "Comparative Evaluation of a Two Stroke Compressed
Natural Gas Mixer Design using Simulation and Experimental
Techniques", International Conference on Association of Science and
Technology for Development, Power and Energy Systems, Langkawi,
359-362, 2008.
[3] Yusaf T. F., "Development of a 3d CFD Model to Investigate the Effect
of the Mixing Quality on the CNG-Diesel Engine Performance", 1995.
[4] Smith K., Arellano L. and Jerry I. "Tustaniwskyj Designing a Fuel/Air
Mixer to Reduce Emissions", University of California, San Diego
Department of Mechanical Engineering, USA, 2006.
[5] Mardani H., "Development of Intake System for Improvement of
Performance of Compressed Natural Gas Spark Ignition Engine",
Universiti Teknologi Malaysia, 42-47, 2004.
[6] Liepmann W. H. and Roshko a., "Element of Gas Dynamics", John
Wiley and Sons, Inc, 1960.
[7] Raghunathan B. D. and Kenny R. G., "CFD simulation and validation of
the flow within a motored two stroke engine", International Congress
and Exposition, Detroit, Michigan 1997, SAE 970359, 1997.
[8] Xu B. Y. and Furuyama M., "Visualization of Natural Gas-Air Mixing
Flow in the Mixer of a CNG Vehicle", Technical Notes, JSAE Review,
18 57 82, 1997.
[9] Rahim A. R., "Design and Simulate Mixing of Compressed Natural Gas
with Air in a mixing device", Malaysian Technical Universities
Conference on Engineering and Technology, Perlis, Vol. 2, 99-104,
2008.
[10] Ganesan. V, "Internal Combustion Engine", Second edition, McGraw-
Hill Book Company, 2004.
[1] Maxwell T. T. and Jones J. C., "Alternative Fuels: Emissions,
Economics and Performance", USA Society of Automotive Engineers,
SAE Inc, 1995.
[2] Devarajan R., "Comparative Evaluation of a Two Stroke Compressed
Natural Gas Mixer Design using Simulation and Experimental
Techniques", International Conference on Association of Science and
Technology for Development, Power and Energy Systems, Langkawi,
359-362, 2008.
[3] Yusaf T. F., "Development of a 3d CFD Model to Investigate the Effect
of the Mixing Quality on the CNG-Diesel Engine Performance", 1995.
[4] Smith K., Arellano L. and Jerry I. "Tustaniwskyj Designing a Fuel/Air
Mixer to Reduce Emissions", University of California, San Diego
Department of Mechanical Engineering, USA, 2006.
[5] Mardani H., "Development of Intake System for Improvement of
Performance of Compressed Natural Gas Spark Ignition Engine",
Universiti Teknologi Malaysia, 42-47, 2004.
[6] Liepmann W. H. and Roshko a., "Element of Gas Dynamics", John
Wiley and Sons, Inc, 1960.
[7] Raghunathan B. D. and Kenny R. G., "CFD simulation and validation of
the flow within a motored two stroke engine", International Congress
and Exposition, Detroit, Michigan 1997, SAE 970359, 1997.
[8] Xu B. Y. and Furuyama M., "Visualization of Natural Gas-Air Mixing
Flow in the Mixer of a CNG Vehicle", Technical Notes, JSAE Review,
18 57 82, 1997.
[9] Rahim A. R., "Design and Simulate Mixing of Compressed Natural Gas
with Air in a mixing device", Malaysian Technical Universities
Conference on Engineering and Technology, Perlis, Vol. 2, 99-104,
2008.
[10] Ganesan. V, "Internal Combustion Engine", Second edition, McGraw-
Hill Book Company, 2004.
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:50717", author = "Mofid Gorjibandpy and Mehdi Kazemi Sangsereki", title = "Computational Investigation of Air-Gas Venturi Mixer for Powered Bi-Fuel Diesel Engine", abstract = "In a bi-fuel diesel engine, the carburetor plays a vital
role in switching from fuel gas to petrol mode operation and viceversa.
The carburetor is the most important part of the fuel system of
a diesel engine. All diesel engines carry variable venturi mixer
carburetors. The basic operation of the carburetor mainly depends on
the restriction barrel called the venturi. When air flows through the
venturi, its speed increases and its pressure decreases. The main
challenge focuses on designing a mixing device which mixes the
supplied gas is the incoming air at an optimum ratio. In order to
surmount the identified problems, the way fuel gas and air flow in
the mixer have to be analyzed. In this case, the Computational Fluid
Dynamics or CFD approach is applied in design of the prototype
mixer. The present work is aimed at further understanding of the air
and fuel flow structure by performing CFD studies using a software
code. In this study for mixing air and gas in the condition that has
been mentioned in continuance, some mixers have been designed.
Then using of computational fluid dynamics, the optimum mixer has
been selected. The results indicated that mixer with 12 holes can
produce a homogenous mixture than those of 8-holes and 6-holes
mixer. Also the result showed that if inlet convergency was smoother
than outlet divergency, the mixture get more homogenous, the reason
of that is in increasing turbulence in outlet divergency.", keywords = "Computational Fluid Dynamics, Venturi mixer,
Air-fuel ratio, Turbulence.", volume = "4", number = "11", pages = "1170-5", }