Influence of Engine Speed on Mixing and Emission Characteristics of Multiple-Injection Common Rail Direct Injection Diesel Engine

Abstract:

Increase in engine speed increases the in-cylinder turbulence and hence the rate of mixing. However, it is difficult to directly measure the mixing rate and relating its effect on emissions. Hence, in this paper, the comparison of mixing rate at different engine speeds are demonstrated with a multi-zone phenomenological model which has been developed and validated on a wide range of engine operating conditions. The mixing rate is evaluated using a standard quasi-dimensional k-ε formulation. The quantitative predictions of mixing rates at different engine speed substantiate the cause of soot emission reduction at higher engine speed.

• Periodical: Applied Mechanics and Materials (Volume 787)
• Pages: 702-706
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.787.702
• Online since: August 2015
• Authors: S. Rajkumar*, G. Sudarshan
• Keywords: CRDI Engine, Mixing Rate, Multiple-Injection, Phenomenological Model

References

[1] F. Wåhlin, A. Cronhjort, U. Olofsson and H. Ångström, Effect of Injection Pressure and Engine Speed on Air/Fuel Mixing and Emissions in a Pre-Mixed Compression Ignited (PCI) Engine Using Diesel Fuel. SAE Paper 2004-01-2989.

DOI: 10.4271/2004-01-2989

[2] S. Rajkumar, G. Sudarshan, Multi-zone phenomenological model of combustion and emission characteristics and parametric investigations for split and multiple-injection in common rail direct injection diesel engines. Proc. IMechE, Part D: Jl of Automotive Engineering, 2014. DOI: 10. 1177/0954407014560797.

DOI: 10.1177/0954407014560797

[3] T. Bhaskar and P.S. Mehta, A multizone diesel combustion model using eddy dissipation concept In: 4th International Symposium on Diagnostics and Modeling of Combustion in Internal Combustion Engines (COMODIA), Tokyo, Japan, (1998).

DOI: 10.1299/jmsesdm.01.204.14

[4] Neer and U.O. Koylu, Effect of operating conditions on the size, morphology, and concentration of submicrometer particulates emitted from a diesel engine. Combustion and Flame, 146 (2006) 142–154.

DOI: 10.1016/j.combustflame.2006.04.003

[5] M. Arai, K. Amagai, T. Nakaji and S. Hayashi, Primary and aggregate size distributions of PM in tail pipe emissions from diesel engines, JSME International Journal, Series B. 48 (2005) 639–647.

DOI: 10.1299/jsmeb.48.639

[6] M. Lapuertaa, F.J. Martosb and J.M. Herrerosa, Effect of engine operating conditions on the size of primary particles composing diesel soot agglomerates. Journal of Aerosol Science. 38 (2007) 455–466.

DOI: 10.1016/j.jaerosci.2007.02.001

[7] H. Tesarek, Investigations concerning the employment possibilities of the diesel-gas process for reducing exhaust emissions, especially soot (Particulate Matters). SAE paper 750158.

DOI: 10.4271/750158

[8] R.D. Reitz and C.J. Rutland, Development and testing of diesel engine CFD models. Progress in Energy Combustion Science. 21 (1995) 173-196.

DOI: 10.1016/0360-1285(95)00003-z

[9] T.C. Tow, D.A. Pierpont and R.D. Reitz, Reducing Particulate and NOx Using Multiple Injections in a Heavy Duty D.I. Diesel Engine. SAE paper 940897, 1403-1417.

DOI: 10.4271/940897

[10] S.K. Chen, Simultaneous Reduction of NOx and Particulate Emission Using Multiple Injections in a Small Diesel Engine. SAE paper 2000-01-3084.

DOI: 10.4271/2000-01-3084