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Ravikrishna R.V.,Indian Institute of Science | Pandey S.K.,Engine Research and Development | Muralitharan N.,Engine Research and Development
Journal of Combustion | Year: 2011

A quasi-dimensional modelling study is conducted for the first time for a heavy duty, diesel-fuelled, multicylinder engine operating in HCCI mode. This quasidimensional approach involves a zero-dimensional single-zone homogeneous charge compression ignition (HCCI) combustion model along with a one-dimensional treatment of the intake and exhaust systems. A skeletal chemical kinetic scheme for n-heptane was used in the simulations. Exhaust gas recirculation (EGR) and compression ratio (CR) were the two parameters that were altered in order to deal with the challenges of combustion phasing control and operating load range extension. Results from the HCCI mode simulations show good potential when compared to conventional diesel performance with respect to important performance parameters such as peak firing pressure, specific fuel consumption, peak pressure rise, and combustion noise. This study shows that HCCI combustion mode can be employed at part load of 25 varying the EGR rates between 0 and 60. © 2011 Sunil Kumar Pandey et al. Source

Nain A.,Engine Research and Development | Panigrahi B.S.,Engine Research and Development | Bandaru B.,Engine Research and Development | Pandey S.K.,Engine Research and Development | Muralitharan N.,Engine Research and Development
SAE Technical Papers | Year: 2011

In the present work, a 4 cylinder, 5.3 liter, Direct Injection Diesel engine producing 140 kW rated power was upgraded to a higher power rating of 170 kW complying with Euro V emission norm. The exhaust after treatment strategy was changed from Exhaust Gas Recirculation (EGR) to Selective Catalytic Reduction (SCR). 1-D thermodynamic simulation was used to simulate the performance. The simulation model was calibrated for performance parameters with the test results available from the 140 kW engine. This model was used to carry out the turbocharger matching for the 170 kW engine using the Simplified and Full Turbocharger model. A parametric study was carried out for the variables like Compression ratio, Start of Combustion shift and Compressor pressure ratio in view of the target Brake Specific Fuel Consumption (BSFC) and Peak firing pressure limits. The finalized model parameters were used for carrying out a Full throttle and Part throttle performance at selected operating points. An altitude simulation was carried out to see the turbocharger performance at an altitude of 1500 m. Simulation of Pollutant formation was carried out for the 140 kW base model by calibrating the model parameters to match the test data. The study was carried out using the Mixing Controlled Combustion (MCC) model. This calibrated model was used for predicting emission for the new engine power rating. The predicted emission trend was used to fine tune the model performance parameters before taking the new engine to the test bed which resulted in considerable savings of testing time. Copyright © 2011 SAE International. Source

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