Numerical Simulation of Diesel Sprays under Hot Bomb Conditions

Authors: Ishtiaq A. Chaudhry, Zia R Tahir, F. A. Siddiqui, F. Noor, M. J. Rashid

Abstract:

It has experimentally been proved that the performance of compression ignition (C.I.) engine is spray characteristics related. In modern diesel engine the spray formation and the eventual combustion process are the vital processes that offer more challenges towards enhancing the engine performance. In the present work the numerical simulation has been carried out for evaporating diesel sprays using Fluent software. For computational fluid dynamics simulation “Meshing” is done using Gambit software before transmitting it into Fluent. The simulation is carried out using hot bomb conditions under varying chamber conditions such as gas pressure, nozzle diameter and fuel injection pressure. For comparison purpose, the numerical simulations the chamber conditions were kept the same as that of the experimental data. At varying chamber conditions the spray penetration rates are compared with the existing experimental results.

Keywords: Evaporating diesel sprays, Penetration rates, Hot bomb conditions.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1099204

References:

[2] Pierpont, D.A., Montgomery, D.T., Reitz, R.D., 1995. “Reducing particle and NOx using multiple injection and EGR in a D.I. diesel” SAE Paper 950217.
[3] K. Karimi 2007: Characterization of Multiple-Injection Diesel Sprays at Elevated Pressures and Temperatures; PhD thesis submitted University of Brighton.
[4] Mirza, M. R., “Studies of Diesel sprays interacting with cross flows and solid boundaries”, PhD Thesis, UMIST UK 1991.
[5] M. R. Mirza, A. H. Baluch, I. A. Chaudhry; “Structure of evaporating diesel sprays” Pak. J. Engg. & Appl. Sci, 1(2007) 8-13.
[6] Dent, J. C.; SAE, (1971) 71057.
[7] J. Williams T. J.; Proc. I. Mech. E., 187 (1973), 69/73.
[8] Hiroyasu, H., and Arai, M., “Structure of fuel spray in Diesel engines”, SAE vol 99, 1990.
[9] Reitz. R. D. “Mechanisms of Atomization Processes in High-Pressure Vaporizing Sprays” Atomization and Spray Technology, 3:309-337, 1987.
[10] M. R. Mirza, A. H. Baluch, Z.R. Tahir; “Structure of non-evaporating diesel sprays” Pak. J. Engg. & Appl. Sci, 2(2008) 1-8.
[11] Ishtiaq A. Chaudhry, M.R. Mirza, M. J. Rashid; “Simulation of Non – Evaporating Diesel Sprays and Comparison with Empirical Correlation” Pak. J. Engg. & Appl. Sci, V. 7, 2(2010), 1-11.
[12] Ishtiaq A. Chaudhry, M.R. Mirza, M. J. Rashid; “Simulation of Oblique Evaporating Diesel Sprays, and Comparison with Empirical Correlations and Simulated Straight Sprays” Pak. J. Engg. & Appl. Sci, V. 7, (2010), 30-67.