• Dr. Subbarao Chamarthi

Turbocharging is a pivotal technology for enhancing fuel efficiency and reducing emissions in compression ignition (CI) engines, particularly in off-road heavy-duty applications. This study investigates the optimization of turbocharging systems in a 129 kW CRDI diesel engine used in excavation equipment. A comparative analysis was conducted between a conventional waste-gate (WG) turbocharger and a non-waste-gate (NWG) variant using AVL BOOST 1-D simulation and experimental validation on an engine test bench. Key performance parameters such as boost pressure, air-fuel ratio (AFR), brake specific fuel consumption (BSFC), and combustion characteristics were evaluated. The NWG configuration demonstrated superior performance, achieving up to 8% improvement in SFC across various engine speeds. Enhanced AFR stability, improved combustion phasing, and reduced pumping losses contributed significantly to this enhancement. The integration of simulation and experimentation validated the predictive capability of AVL BOOST and confirmed the practical benefits of NWG turbochargers in real-world operating conditions.

Turbocharger optimization, AVL BOOST, CI engine, SFC improvement, air-fuel ratio, emissions control.

"Advanced Turbocharger Optimization for Fuel Efficiency in CI Engines: Simulation and Experimental Validation", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.12, Issue 10, page no.c518-c531, October-2025, Available :http://www.jetir.org/papers/JETIR2510269.pdf

"Advanced Turbocharger Optimization for Fuel Efficiency in CI Engines: Simulation and Experimental Validation", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.12, Issue 10, page no. ppc518-c531, October-2025, Available at : http://www.jetir.org/papers/JETIR2510269.pdf