Production of Negative Pressure by an Exhaust Pipe with Stepped or Conical Open End

抄録

It is a well known fact that the scavenging of an internal combustion engine by the utilization of the wave effect in the exhaust pipe is promoted by a stepped or conical open end. However, most of the works along this line hitherto performed are confined to the qualitative ones. The authors have theoretically treated the wave phenomena in the pipe with a stepped or conical open end, and determined the optimum area-ratio of the step or the diffuser to produce the maximum energy of rarefaction wave. The results obtained are experimentally confirmed with an air model by measuring the energy of rarefaction wave.