Title: A methodology for analysis of diesel engine in-cylinder flow and combustion

Authors: C.S. Sharma, T.N.C. Anand, R.V. Ravikrishna

Addresses: Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560012, India. ' Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560012, India. ' Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560012, India

Abstract: A methodology is developed for the analysis of diesel engine in-cylinder processes and combustion. Beginning from CAD data of the engine geometry, the methodology involves use of a commercial code AVL FIRE for simulation of suction stroke, and an open-source code KIVA-3V for simulation of the closed-valve part of the diesel cycle. For this, an algorithm is first developed to map a generalised three-dimensional Computational Fluid Dynamics (CFD) solution from an unstructured mesh in AVL FIRE to a structured mesh in KIVA-3V to provide initial conditions for the closed-valve simulations. For simulation of diesel combustion process, an integrated KIVA-3V code is developed by incorporating two well-validated models into the standard code: the Shell hydrocarbon auto-ignition model for simulation of diesel auto-ignition under conditions of high temperature and pressure, and the Characteristic-time model for simulation of subsequent diesel combustion. The integrated code is validated and calibrated against experimental pressure measurements in a naturally aspirated direct injection diesel engine. These tools are then used for exploring the potential of a constant-speed, turbocharged diesel engine towards emission reduction. The case study involves combustion simulations for exploring multiple injection strategy for the engine concerned.

Keywords: CFD; computational fluid dynamics; combustion modelling; emissions; in-cylinder flow; simulation; suction stroke; closed valve; diesel auto-ignition; high temperature; pressure; direct injection diesel engines; turbocharged diesel engines; emission reduction.

DOI: 10.1504/PCFD.2010.033327

Progress in Computational Fluid Dynamics, An International Journal, 2010 Vol.10 No.3, pp.157 - 167

Available online: 25 May 2010 *

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