A MODEL FOR THE ANALYSIS AND PREDICTION OF HEAT AND MASS TRANSFER AND COMBUSTION OF FUELS IN DIESEL ENGINES. NATIONAL ENERGY RESEARCH, DEVELOPMENT AND DEMONSTRATION END OF GRANT REPORT

The objective of the present work is to develop an analysis tool, which can be used to study the thermodynamic differences which alternative fuels e.g., vegetable oils, alcohol, etc., confer on the various thermodynamic processes in the engine. To meet this objective a multi zone model in zero dimensions is proposed. The various features of the model can be summarized as follows: 1) the model accounts for the atomization process of the fuel by taking into consideration the droplet distribution of the injected fuel; 2) existing mass transfer equations are modified to account for the high pressure and high temperature conditions in which the fuel droplets in the injected fuel spray evaporates; 3) an effective spray angle is calculated at each computational step to account for the volume changes in the various fuel packages. This is done during the combustion process as well, when the volume changes are quite significant. This allows for a more realistic air entrainment pattern during combustion; 4) a heat transfer model for calculating the heat transfer from gases to the cylinder wall, based on the analysis of boundary layer gases is proposed. It is assumed that mechanism of heat transfer is predominantly conductive heat transfer from the gases in the thin laminar boundary layer to the cylinder wall. The rate of burning is assumed to be given by a relaxation type equation and involves a parameter tau. In other words the prepared fuel does not burn immediately but there is a finite time involved. The model has three modules: spray evaporation model; heat transfer model; and heat release model. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0642085366
• Corporate Authors:

  Australian Department of Resources and Energy

  GPO Box 858
  Parkville, Victoria,   Australia 
• Authors:
  • Kumar, S
• Publication Date: 1984-12

Media Info

• Features: References;
• Pagination: 45 p.
• Serial:
  • Publication of: Department of Resources and Energy, Australia
  • Publisher: Department of Resources and Energy
  • ISSN: 0811-9570

Subject/Index Terms

• TRT Terms: Alcohols; Alternate fuels; Combustion; Diesel engines; Heat transfer; High temperature; Mathematical models; Pressure; Thermodynamics; Vegetable oils
• Uncontrolled Terms: High pressure
• ITRD Terms: 3860: Combustion; 1314: Diesel engine; 7183: Evaporation; 3850: Fuel; 6743: Heat; 3830: Injection (fuel); 6473: Mathematical model; 5412: Pressure; 6722: Temperature; 6731: Transfer (phys); 5485: Weight
• Subject Areas: Public Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00478688
• Record Type: Publication
• Source Agency: ARRB
• ISBN: 0-642-08536-6
• Report/Paper Numbers: No. 465 T 65/84
• Files: ITRD, TRIS
• Created Date: Jan 31 1989 12:00AM