Commenced in January 2007
Paper Count: 31097
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.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1055461Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 3449
 Maxwell T. T. and Jones J. C., "Alternative Fuels: Emissions, Economics and Performance", USA Society of Automotive Engineers, SAE Inc, 1995.
 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.
 Yusaf T. F., "Development of a 3d CFD Model to Investigate the Effect of the Mixing Quality on the CNG-Diesel Engine Performance", 1995.
 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.
 Mardani H., "Development of Intake System for Improvement of Performance of Compressed Natural Gas Spark Ignition Engine", Universiti Teknologi Malaysia, 42-47, 2004.
 Liepmann W. H. and Roshko a., "Element of Gas Dynamics", John Wiley and Sons, Inc, 1960.
 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.
 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.
 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.
 Ganesan. V, "Internal Combustion Engine", Second edition, McGraw- Hill Book Company, 2004.