Estimating the Effects of Altitude, Ambient Temperature and Turbocharger Match on Engine Performance

Abstract

The authors have outlined the simple theory of the exhaust gas driven turbocharger in association with the diesel engine. After a short statement of early empirically based assessments of the effect of altitude on supercharged engine output the theory is used to derive a method of calculation of engine performance, using a digital computer. A semi-empirical graphical method is then developed which may be used to assess the effect of turbocharger match, altitude, ambient temperature and fuel consumption on a known engine. Experimental evidence of the validity of the method is given.