0n the Transmission of the Blow-Down Energy in the Exhaust System of a Diesel Engine

Abstract

For the improvement of the performance of a turbocharged Diesel engine with a pulse system, the utilization of the blow-down energy is most important. The present authors have carried out the experiments on the transmission of the blow-down energy with the air model similar to the exhaust system of an actual engine. By measuring the kinetic energy of the air ejected from the equivalent nozzle at the pipe end, several factors-pipe length, pipe diameter, area ratio of the nozzle to the pipe, and exhaust pressure -affecting the energy transmission, were found out. Further the theoretical calculations were performed by means of the characteristic method. The results thus obtained argee almost exactly with those of the experiments, when the friction loss in the exhaust pipe is taken into consideration.