Abstract:

The paper studies the combustion properties of the Neem NB-10 biodiesel engine through CFD analysis and validates the same experimentally.  Initially the tests were carried out for Compression Ratios (CRs) 12:1, 15:1 & 17:1 at varied loads for different blends viz., NB-10, NB-15, NB-20, and   NB-25 using variable compression ratio, 4-Stroke CI engine. At maximum load (80%), NB-10 exhibits better performance and emission characteristics compared to other biodiesel blends. CFD simulations were performed with 120° sector geometry for the period when both inlet and outlet valves are closed.   ANSYS Fluent 15.0 software was utilized to consider the impact of compression ratio on the peak pressure, temperature, rate of heat release (HRR), and delay in the ignition during the combustion.  There was a strong correlation between experimental & CFD simulation results.

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