Turbocharging Four-Cycle Diesel Engines

The interaction of turbocharger characteristics with engine design and performance parameters is presented. Turbocharger matching requires a compromise among the following variables: combustion air-fuel ratio, turbocharger characteristics, peak cylinder pressures, engine speed range capability, transient response, and overall package efficiency. The mechanisms of interactions of the above variables are reviewed to highlight the turbocharged engine designers problems. The impact of turbocharger performance limits on overall engine characteristics is reviewed with special attention focused on what limitations point out as the turbomachinery designers' job for the future.