A Method of Measuring the Exhaust-Gas Energy Available for Turbocharging of a Diesel Engine

Abstract

The measurement of the exhaust-gas energy is essential for the design of turbochargers. However, in a pulse system its direct measurement is next to impossible. The present authors have devised a simple method for this purpose. A part of the exhaust gas is by-passed to expand down to the atmospheric pressure through a small measuring nozzle similar to the turbine nozzle. The momentum of by-passed gas is measured as the thrust on a cage, built of piles of aluminum rings and a disc lined with wire gauzes, and the flow rate, by means of an orifice. Thus the mean ejecting velocity of the gas from the turbine nozzle can be calculated. It has been confirmed that the exhaust-gas energy can be determined by the above mentioned method with tolerable accuracy.