Design and experimental study for exhaust pipes of pressure wave supercharged diesel engine

NO_x and soot emissions from diesel engines can be greatly reduced by pressure wave supercharging. The exhaust pipes in the diesel engine matched with pressure wave supercharger (PWS) need to be redesigned. The exhaust gas must be stable in pressure before rushing into the PWS, and the requirements for installation have to be met also. The lateral and center ported divergent exhaust pipes are designed, modeled geometrically and analyzed structurally based on a 3D design software CATIA, to determine the structure of two exhaust pipes. The flow analysis for these two exhaust pipes is carried out using a flow analysis software ANSYS. The better exhaust pipe was determined synthetically and tested in bench. The test results show that PWS, comparing to turbo charging, is superior under low engine speed, close under medium speed and inferior under high speed in power and emission.