Simulation of RCCI Engine

Simulation of RCCI EngineParth JaggiNekkanti AkhilUnder the Guidance ofDr Rakesh Kumar Maurya

Validation of Simulated DataThe simulations were run using experimental parameters from PhD thesis of Atul Dhar. Data obtained was found within close tolerances.Experimental ParametersThe result obtained from simulation had close resemblance with the experimental data.Further simulations keeping the all the parameters constant except Injection timing and the injected quantity were run.ParameterValueBore 85 mmStroke 90 mmConnecting Rod length138 mmCompression Ratio17.5Injection Pressure500 barEngine Speed1500 RPMFuel quantity11.111 mg

Main Injection VariationThe Main Injection timing was varied for a wide range of values. The value of Main Injection for which the Efficiency was highest was chosen for further analysis. The efficiency was found to be maximum for the case when injection starts at -5 CAD.Pilot InjectionPilot Injection was used to enhance mixing and decrease the Rate of Pressure Rise for Diesel Engines. With the use of CRDi systems, this was possible.Lower Rate of Pressure Rise is in direct correlation with the Combustion noise generated.The efficiency in the case of pilot injection was almost found to be same as shown in the graph below.

Pilot InjectionThe pressure curves obtained for different pilot injection are as follows:

Pilot InjectionThe pressure curves obtained for multiple pilot injection are as follows:

Benefits of Pilot Injection

Benefits of Pilot Injection

Benefits of Pilot Injection

PCCIPremixed Charge Compression IgnitionThe basic difference between Diesel and PCCI is that whole fuel is injected prior to the start of combustion in PCCI but in Diesel fuel is injected also once combustion starts.

Burn Time Comparison in PCCI

Burn Time Comparison in PCCI

Efficiency vs Injection TimingWith change in SOI there was very slight change in efficiency.

NOx vs Injection TimingHowever there was a large change in NOx with change in SOI.

EGREGR stands for exhaust gas recirculation. In EGR a portion of an engine'sexhaust gas was recirculated back to the enginecylinders. Where some fraction of the fuel added in the next cycle composed of the exhaust gases. this helps in reducing the NOx emissions and increasing the Efficiency. Effect of EGR on Efficiency

Effect of EGR on NOx Emissions

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