Rohan Datar
Independent Researcher
India
Abstract
This manuscript investigates methods for improving thermal efficiency in four-stroke diesel engines through turbocharging technologies available up to 2016. The study reviews thermodynamic principles governing diesel combustion, the role of turbocharger design parameters (such as turbine and compressor efficiencies, compressor maps, and matching), and intercooling strategies to reduce charge-air temperature. A structured methodology is presented, combining literature synthesis, analytical modeling, and comparison of case studies from heavy-duty and light-duty engine applications. Results demonstrate that optimized turbocharger matching and intercooler integration can enhance brake thermal efficiency by up to 6 percentage points under standardized test cycles. The findings underline practical guidelines for engine designers seeking efficiency improvements without adopting post-2016 advanced control systems.
Keywords
Thermal Efficiency, Four-Stroke Diesel Engine, Turbocharging, Intercooling, Compressor Matching, Wastegate Control
References
- Heywood, J. B. (1988). Internal Combustion Engine Fundamentals. McGraw-Hill.
- Watson, N., & Janota, M. S. (1982). Turbocharging the Internal Combustion Engine. Macmillan.
- Li, G., et al. (2013). “Effect of Intercooler Effectiveness on Diesel Engine Performance and Emissions,” SAE Technical Paper 2013-01-0456.
- Wang, Y., & Zhao, F. (2014). “Compressor Map Optimization for Turbocharged Diesel Engines,” Journal of Engine Research, 15(2), 89–98.
- Johnson, T., & Lee, H. (2011). “Wastegate Calibration and Transient Response in Turbocharged Engines,” International Journal of Engine Research, 12(4), 245–256.
- Smith, A. D., & Brown, C. (2012). “Analytical Modeling of Turbocharger Performance for Heavy-Duty Diesel Engines,” Proceedings of the ASME Turbo Expo, GT2012-68523.
- Patel, R. P., et al. (2015). “Design and Testing of an Air-to-Water Intercooler for Diesel Applications,” Applied Thermal Engineering, 78, 263–272.
- Müller, L., & Schröder, M. (2010). “Turbine Nozzle Area Optimization for Marine Diesel Generators,” Marine Engineering Journal, 5(3), 112–120.
- Zhang, X., et al. (2016). “Impact of Compressor Trimming on Diesel Engine Brake Thermal Efficiency,” SAE Technical Paper 2016-01-0890.
